feat: inspections (#3213)

Co-authored-by: Liyas Thomas <liyascthomas@gmail.com>

packages/hoppscotch-common/locales/en.json

@@ -192,6 +192,7 @@
     "schema": "Connect to a GraphQL endpoint to view schema",
     "shortcodes": "Shortcodes are empty",
     "subscription": "Subscriptions are empty",
+    "suggestions": "No matching suggestions found",
     "team_name": "Team name empty",
     "teams": "You don't belong to any teams",
     "tests": "There are no tests for this request"
@@ -304,6 +305,30 @@
     "preview": "Hide Preview",
     "sidebar": "Collapse sidebar"
   },
+  "inspections": {
+    "title": "Inspector",
+    "description": "Inspect possible errors",
+    "environment": {
+      "add_environment": "Add to Environment",
+      "not_found": "Environment variable “{environment}” not found."
+    },
+    "header": {
+      "cookie": "The browser doesn't allow Hoppscotch to set the Cookie Header. While we're working on the Hoppscotch Desktop App (coming soon), please use the Authorization Header instead."
+    },
+    "response": {
+      "401_error": "Please check your authentication credentials.",
+      "404_error": "Please check your request URL and method type.",
+      "network_error": "Please check your network connection.",
+      "cors_error": "Please check your Cross-Origin Resource Sharing configuration.",
+      "default_error": "Please check your request."
+    },
+    "url": {
+      "extension_not_installed": "Extension not installed.",
+      "extention_not_enabled": "Extension not enabled.",
+      "extention_enable_action": "Enable Browser Extension",
+      "extension_unknown_origin": "Make sure you've added the API endpoint's origin to the Hoppscotch Browser Extension list."
+    }
+  },
   "import": {
     "collections": "Import collections",
     "curl": "Import cURL",

packages/hoppscotch-common/src/components.d.ts

@@ -14,6 +14,7 @@ declare module '@vue/runtime-core' {
     AppFooter: typeof import('./components/app/Footer.vue')['default']
     AppGitHubStarButton: typeof import('./components/app/GitHubStarButton.vue')['default']
     AppHeader: typeof import('./components/app/Header.vue')['default']
+    AppInspection: typeof import('./components/app/Inspection.vue')['default']
     AppInterceptor: typeof import('./components/app/Interceptor.vue')['default']
     AppLogo: typeof import('./components/app/Logo.vue')['default']
     AppOptions: typeof import('./components/app/Options.vue')['default']
@@ -77,8 +78,27 @@ declare module '@vue/runtime-core' {
     History: typeof import('./components/history/index.vue')['default']
     HistoryGraphqlCard: typeof import('./components/history/graphql/Card.vue')['default']
     HistoryRestCard: typeof import('./components/history/rest/Card.vue')['default']
+    HoppButtonPrimary: typeof import('@hoppscotch/ui')['HoppButtonPrimary']
     HoppButtonSecondary: typeof import('@hoppscotch/ui')['HoppButtonSecondary']
+    HoppSmartAnchor: typeof import('@hoppscotch/ui')['HoppSmartAnchor']
+    HoppSmartCheckbox: typeof import('@hoppscotch/ui')['HoppSmartCheckbox']
+    HoppSmartConfirmModal: typeof import('@hoppscotch/ui')['HoppSmartConfirmModal']
+    HoppSmartExpand: typeof import('@hoppscotch/ui')['HoppSmartExpand']
+    HoppSmartFileChip: typeof import('@hoppscotch/ui')['HoppSmartFileChip']
+    HoppSmartInput: typeof import('@hoppscotch/ui')['HoppSmartInput']
+    HoppSmartItem: typeof import('@hoppscotch/ui')['HoppSmartItem']
+    HoppSmartLink: typeof import('@hoppscotch/ui')['HoppSmartLink']
+    HoppSmartModal: typeof import('@hoppscotch/ui')['HoppSmartModal']
+    HoppSmartPicture: typeof import('@hoppscotch/ui')['HoppSmartPicture']
+    HoppSmartPlaceholder: typeof import('@hoppscotch/ui')['HoppSmartPlaceholder']
+    HoppSmartProgressRing: typeof import('@hoppscotch/ui')['HoppSmartProgressRing']
+    HoppSmartRadioGroup: typeof import('@hoppscotch/ui')['HoppSmartRadioGroup']
+    HoppSmartSlideOver: typeof import('@hoppscotch/ui')['HoppSmartSlideOver']
     HoppSmartSpinner: typeof import('@hoppscotch/ui')['HoppSmartSpinner']
+    HoppSmartTab: typeof import('@hoppscotch/ui')['HoppSmartTab']
+    HoppSmartTabs: typeof import('@hoppscotch/ui')['HoppSmartTabs']
+    HoppSmartWindow: typeof import('@hoppscotch/ui')['HoppSmartWindow']
+    HoppSmartWindows: typeof import('@hoppscotch/ui')['HoppSmartWindows']
     HttpAuthorization: typeof import('./components/http/Authorization.vue')['default']
     HttpAuthorizationApiKey: typeof import('./components/http/authorization/ApiKey.vue')['default']
     HttpAuthorizationBasic: typeof import('./components/http/authorization/Basic.vue')['default']
@@ -105,6 +125,21 @@ declare module '@vue/runtime-core' {
     HttpTestResultReport: typeof import('./components/http/TestResultReport.vue')['default']
     HttpTests: typeof import('./components/http/Tests.vue')['default']
     HttpURLEncodedParams: typeof import('./components/http/URLEncodedParams.vue')['default']
+    IconLucideActivity: typeof import('~icons/lucide/activity')['default']
+    IconLucideAlertTriangle: typeof import('~icons/lucide/alert-triangle')['default']
+    IconLucideArrowLeft: typeof import('~icons/lucide/arrow-left')['default']
+    IconLucideArrowUpRight: typeof import('~icons/lucide/arrow-up-right')['default']
+    IconLucideCheckCircle: typeof import('~icons/lucide/check-circle')['default']
+    IconLucideChevronRight: typeof import('~icons/lucide/chevron-right')['default']
+    IconLucideGlobe: typeof import('~icons/lucide/globe')['default']
+    IconLucideHelpCircle: typeof import('~icons/lucide/help-circle')['default']
+    IconLucideInbox: typeof import('~icons/lucide/inbox')['default']
+    IconLucideInfo: typeof import('~icons/lucide/info')['default']
+    IconLucideLayers: typeof import('~icons/lucide/layers')['default']
+    IconLucideListEnd: typeof import('~icons/lucide/list-end')['default']
+    IconLucideMinus: typeof import('~icons/lucide/minus')['default']
+    IconLucideSearch: typeof import('~icons/lucide/search')['default']
+    IconLucideUsers: typeof import('~icons/lucide/users')['default']
     LensesHeadersRenderer: typeof import('./components/lenses/HeadersRenderer.vue')['default']
     LensesHeadersRendererEntry: typeof import('./components/lenses/HeadersRendererEntry.vue')['default']
     LensesRenderersAudioLensRenderer: typeof import('./components/lenses/renderers/AudioLensRenderer.vue')['default']

packages/hoppscotch-common/src/components/app/Inspection.vue

@@ -0,0 +1,112 @@
+<template>
+  <div v-if="inspectionResults && inspectionResults.length > 0">
+    <tippy interactive trigger="click" theme="popover">
+      <div class="flex justify-center items-center flex-1 flex-col">
+        <HoppButtonSecondary
+          v-tippy="{ theme: 'tooltip' }"
+          :icon="IconAlertTriangle"
+          :class="severityColor(getHighestSeverity.severity)"
+          :title="t('inspections.description')"
+        />
+      </div>
+      <template #content="{ hide }">
+        <div class="flex flex-col space-y-2 items-start flex-1">
+          <div
+            class="flex justify-between border rounded pl-2 border-divider bg-popover sticky top-0 self-stretch"
+          >
+            <span class="flex items-center flex-1">
+              <icon-lucide-activity class="mr-2 svg-icons text-accent" />
+              <span class="font-bold">
+                {{ t("inspections.title") }}
+              </span>
+            </span>
+            <HoppButtonSecondary
+              v-tippy="{ theme: 'tooltip' }"
+              to="https://docs.hoppscotch.io/documentation/features/inspections"
+              blank
+              :title="t('app.wiki')"
+              :icon="IconHelpCircle"
+            />
+          </div>
+          <div
+            v-for="(inspector, index) in inspectionResults"
+            :key="index"
+            class="flex self-stretch"
+          >
+            <div
+              class="flex flex-col flex-1 rounded border border-dashed border-dividerDark divide-y divide-dashed divide-dividerDark"
+            >
+              <span
+                v-if="inspector.text.type === 'text'"
+                class="flex-1 px-3 py-2"
+              >
+                {{ inspector.text.text }}
+                <HoppSmartLink
+                  blank
+                  :to="inspector.doc.link"
+                  class="text-accent hover:text-accentDark transition"
+                >
+                  {{ inspector.doc.text }}
+                  <icon-lucide-arrow-up-right class="svg-icons" />
+                </HoppSmartLink>
+              </span>
+              <span v-if="inspector.action" class="flex p-2 space-x-2">
+                <HoppButtonSecondary
+                  :label="inspector.action.text"
+                  outline
+                  filled
+                  @click="
+                    () => {
+                      inspector.action?.apply()
+                      hide()
+                    }
+                  "
+                />
+              </span>
+            </div>
+          </div>
+        </div>
+      </template>
+    </tippy>
+  </div>
+</template>
+
+<script lang="ts" setup>
+import { InspectorResult } from "~/services/inspection"
+import IconAlertTriangle from "~icons/lucide/alert-triangle"
+import IconHelpCircle from "~icons/lucide/help-circle"
+import { computed } from "vue"
+import { useI18n } from "~/composables/i18n"
+
+const t = useI18n()
+
+const props = defineProps<{
+  inspectionResults: InspectorResult[] | undefined
+}>()
+
+const getHighestSeverity = computed(() => {
+  if (props.inspectionResults) {
+    return props.inspectionResults.reduce(
+      (prev, curr) => {
+        return prev.severity > curr.severity ? prev : curr
+      },
+      { severity: 0 }
+    )
+  } else {
+    return { severity: 0 }
+  }
+})
+
+const severityColor = (severity: number) => {
+  switch (severity) {
+    case 1:
+      return "!text-green-500 hover:!text-green-600"
+    case 2:
+      return "!text-yellow-500 hover:!text-yellow-600"
+    case 3:
+      return "!text-red-500 hover:!text-red-600"
+    default:
+      return "!text-gray-500 hover:!text-gray-600"
+  }
+}
+</script>

packages/hoppscotch-common/src/components/http/Headers.vue

@@ -79,16 +79,13 @@
                 tabindex="-1"
               />
             </span>
-            <HoppSmartAutoComplete
+            <SmartEnvInput
+              v-model="header.key"
               :placeholder="`${t('count.header', { count: index + 1 })}`"
-              :source="commonHeaders"
+              :auto-complete-source="commonHeaders"
-              :spellcheck="false"
+              :env-index="index"
-              :value="header.key"
+              :inspection-results="getInspectorResult(headerKeyResults, index)"
-              autofocus
+              @change="
-              styles=" bg-transparent flex flex-1
-            py-1 px-4 truncate "
-              class="flex-1 !flex"
-              @input="
                 updateHeader(index, {
                   id: header.id,
                   key: $event,
@@ -100,6 +97,10 @@
             <SmartEnvInput
               v-model="header.value"
               :placeholder="`${t('count.value', { count: index + 1 })}`"
+              :inspection-results="
+                getInspectorResult(headerValueResults, index)
+              "
+              :env-index="index"
               @change="
                 updateHeader(index, {
                   id: header.id,
@@ -265,6 +266,9 @@ import {
 } from "~/helpers/utils/EffectiveURL"
 import { aggregateEnvs$, getAggregateEnvs } from "~/newstore/environments"
 import { useVModel } from "@vueuse/core"
+import { useService } from "dioc/vue"
+import { InspectionService, InspectorResult } from "~/services/inspection"
+import { currentTabID } from "~/helpers/rest/tab"
 
 const t = useI18n()
 const toast = useToast()
@@ -502,4 +506,39 @@ const changeTab = (tab: ComputedHeader["source"]) => {
   if (tab === "auth") emit("change-tab", "authorization")
   else emit("change-tab", "bodyParams")
 }
+
+const inspectionService = useService(InspectionService)
+
+const allTabResults = inspectionService.tabs
+
+const headerKeyResults = computed(() => {
+  return (
+    allTabResults.value
+      .get(currentTabID.value)
+      .filter(
+        (result) =>
+          result.locations.type === "header" &&
+          result.locations.position === "key"
+      ) ?? []
+  )
+})
+const headerValueResults = computed(() => {
+  return (
+    allTabResults.value
+      .get(currentTabID.value)
+      .filter(
+        (result) =>
+          result.locations.type === "header" &&
+          result.locations.position === "value"
+      ) ?? []
+  )
+})
+
+const getInspectorResult = (results: InspectorResult[], index: number) => {
+  return results.filter((result) => {
+    if (result.locations.type === "url" || result.locations.type === "response")
+      return
+    return result.locations.index === index
+  })
+}
 </script>

packages/hoppscotch-common/src/components/http/Parameters.vue

@@ -82,6 +82,9 @@
             <SmartEnvInput
               v-model="param.key"
               :placeholder="`${t('count.parameter', { count: index + 1 })}`"
+              :inspection-results="
+                getInspectorResult(parameterKeyResults, index)
+              "
               @change="
                 updateParam(index, {
                   id: param.id,
@@ -94,6 +97,9 @@
             <SmartEnvInput
               v-model="param.value"
               :placeholder="`${t('count.value', { count: index + 1 })}`"
+              :inspection-results="
+                getInspectorResult(parameterValueResults, index)
+              "
               @change="
                 updateParam(index, {
                   id: param.id,
@@ -173,7 +179,7 @@ import IconCheckCircle from "~icons/lucide/check-circle"
 import IconCircle from "~icons/lucide/circle"
 import IconTrash from "~icons/lucide/trash"
 import IconWrapText from "~icons/lucide/wrap-text"
-import { reactive, ref, watch } from "vue"
+import { computed, reactive, ref, watch } from "vue"
 import { flow, pipe } from "fp-ts/function"
 import * as O from "fp-ts/Option"
 import * as A from "fp-ts/Array"
@@ -195,6 +201,9 @@ import { useToast } from "@composables/toast"
 import { throwError } from "@functional/error"
 import { objRemoveKey } from "@functional/object"
 import { useVModel } from "@vueuse/core"
+import { useService } from "dioc/vue"
+import { InspectionService, InspectorResult } from "~/services/inspection"
+import { currentTabID } from "~/helpers/rest/tab"
 
 const colorMode = useColorMode()
 
@@ -398,4 +407,39 @@ const clearContent = () => {
 
   bulkParams.value = ""
 }
+
+const inspectionService = useService(InspectionService)
+
+const allTabResults = inspectionService.tabs
+
+const parameterKeyResults = computed(() => {
+  return (
+    allTabResults.value
+      .get(currentTabID.value)
+      .filter(
+        (result) =>
+          result.locations.type === "parameter" &&
+          result.locations.position === "key"
+      ) ?? []
+  )
+})
+const parameterValueResults = computed(() => {
+  return (
+    allTabResults.value
+      .get(currentTabID.value)
+      .filter(
+        (result) =>
+          result.locations.type === "parameter" &&
+          result.locations.position === "value"
+      ) ?? []
+  )
+})
+
+const getInspectorResult = (results: InspectorResult[], index: number) => {
+  return results.filter((result) => {
+    if (result.locations.type === "url" || result.locations.type === "response")
+      return
+    return result.locations.index === index
+  })
+}
 </script>

packages/hoppscotch-common/src/components/http/Request.vue

@@ -53,9 +53,16 @@
           v-model="tab.document.request.endpoint"
           :placeholder="`${t('request.url')}`"
           :auto-complete-source="userHistories"
+          :inspection-results="tabResults"
           @paste="onPasteUrl($event)"
           @enter="newSendRequest"
-        />
+        >
+          <template #empty>
+            <span>
+              {{ t("empty.history_suggestions") }}
+            </span>
+          </template>
+        </SmartEnvInput>
       </div>
     </div>
     <div class="flex mt-2 sm:mt-0">
@@ -259,12 +266,14 @@ import IconLink2 from "~icons/lucide/link-2"
 import IconRotateCCW from "~icons/lucide/rotate-ccw"
 import IconSave from "~icons/lucide/save"
 import IconShare2 from "~icons/lucide/share-2"
-import { HoppRESTTab } from "~/helpers/rest/tab"
+import { HoppRESTTab, currentTabID } from "~/helpers/rest/tab"
 import { getDefaultRESTRequest } from "~/helpers/rest/default"
 import { RESTHistoryEntry, restHistory$ } from "~/newstore/history"
 import { platform } from "~/platform"
 import { getCurrentStrategyID } from "~/helpers/network"
 import { HoppGQLRequest, HoppRESTRequest } from "@hoppscotch/data"
+import { useService } from "dioc/vue"
+import { InspectionService } from "~/services/inspection"
 
 const t = useI18n()
 
@@ -628,4 +637,12 @@ const isCustomMethod = computed(() => {
 })
 
 const COLUMN_LAYOUT = useSetting("COLUMN_LAYOUT")
+
+const inspectionService = useService(InspectionService)
+
+const allTabResults = inspectionService.tabs
+
+const tabResults = computed(() => {
+  return allTabResults.value.get(currentTabID.value) ?? []
+})
 </script>

packages/hoppscotch-common/src/components/http/Response.vue

@@ -1,5 +1,5 @@
 <template>
-  <div class="flex flex-col flex-1">
+  <div class="flex flex-col flex-1 relative">
     <HttpResponseMeta :response="tab.response" />
     <LensesResponseBodyRenderer
       v-if="!loading && hasResponse"

packages/hoppscotch-common/src/components/http/ResponseMeta.vue

@@ -1,6 +1,6 @@
 <template>
   <div
-    class="sticky top-0 z-10 flex items-start justify-center flex-shrink-0 p-4 overflow-auto overflow-x-auto bg-primary whitespace-nowrap"
+    class="sticky top-0 z-10 flex items-center justify-center flex-shrink-0 p-4 overflow-auto overflow-x-auto bg-primary whitespace-nowrap"
   >
     <AppShortcutsPrompt v-if="response == null" class="flex-1" />
     <div v-else class="flex flex-col flex-1">
@@ -70,6 +70,15 @@
         </div>
       </div>
     </div>
+    <AppInspection
+      v-if="response?.type !== 'loading'"
+      :inspection-results="tabResults"
+      :class="[
+        response === null || response?.type === 'network_fail'
+          ? 'absolute right-2 top-2'
+          : 'ml-2 -m-2',
+      ]"
+    />
   </div>
 </template>
 
@@ -80,6 +89,9 @@ import type { HoppRESTResponse } from "~/helpers/types/HoppRESTResponse"
 import { useI18n } from "@composables/i18n"
 import { useColorMode } from "@composables/theming"
 import { getStatusCodeReasonPhrase } from "~/helpers/utils/statusCodes"
+import { useService } from "dioc/vue"
+import { InspectionService } from "~/services/inspection"
+import { currentTabID } from "~/helpers/rest/tab"
 
 const t = useI18n()
 const colorMode = useColorMode()
@@ -128,4 +140,16 @@ const statusCategory = computed(() => {
     }
   return findStatusGroup(props.response.statusCode)
 })
+
+const inspectionService = useService(InspectionService)
+
+const allTabResults = inspectionService.tabs
+
+const tabResults = computed(() => {
+  return (
+    allTabResults.value
+      .get(currentTabID.value)
+      ?.filter((result) => result.locations.type === "response") ?? []
+  )
+})
 </script>

packages/hoppscotch-common/src/components/smart/EnvInput.vue

@@ -10,6 +10,7 @@
         @keydown="handleKeystroke"
         @focusin="showSuggestionPopover = true"
       ></div>
+      <AppInspection :inspection-results="inspectionResults" />
     </div>
     <ul
       v-if="showSuggestionPopover && autoCompleteSource"
@@ -34,8 +35,11 @@
         </div>
       </li>
       <li v-if="suggestions.length === 0" class="pointer-events-none">
-        <span class="truncate py-0.5">
+        <div v-if="slots.empty" class="truncate py-0.5">
-          {{ t("empty.history_suggestions") }}
+          <slot name="empty"></slot>
+        </div>
+        <span v-else class="truncate py-0.5">
+          {{ t("empty.suggestions") }}
         </span>
       </li>
     </ul>
@@ -43,7 +47,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref, onMounted, watch, nextTick, computed, Ref } from "vue"
+import { ref, onMounted, watch, nextTick, computed, Ref, useSlots } from "vue"
 import {
   EditorView,
   placeholder as placeholderExt,
@@ -62,6 +66,7 @@ import { AggregateEnvironment, aggregateEnvs$ } from "~/newstore/environments"
 import { platform } from "~/platform"
 import { useI18n } from "~/composables/i18n"
 import { onClickOutside, useDebounceFn } from "@vueuse/core"
+import { InspectorResult } from "~/services/inspection"
 import { invokeAction } from "~/helpers/actions"
 
 const props = withDefaults(
@@ -75,6 +80,7 @@ const props = withDefaults(
     environmentHighlights?: boolean
     readonly?: boolean
     autoCompleteSource?: string[]
+    inspectionResults?: InspectorResult[] | undefined
   }>(),
   {
     modelValue: "",
@@ -85,6 +91,8 @@ const props = withDefaults(
     readonly: false,
     environmentHighlights: true,
     autoCompleteSource: undefined,
+    inspectionResult: undefined,
+    inspectionResults: undefined,
   }
 )
 
@@ -98,6 +106,8 @@ const emit = defineEmits<{
   (e: "click", ev: any): void
 }>()
 
+const slots = useSlots()
+
 const t = useI18n()
 
 const cachedValue = ref(props.modelValue)
@@ -142,7 +152,9 @@ const suggestions = computed(() => {
 const updateModelValue = (value: string) => {
   emit("update:modelValue", value)
   emit("change", value)
-  showSuggestionPopover.value = false
+  nextTick(() => {
+    showSuggestionPopover.value = false
+  })
 }
 
 const handleKeystroke = (ev: KeyboardEvent) => {

packages/hoppscotch-common/src/pages/index.vue

@@ -94,7 +94,7 @@
 </template>
 
 <script lang="ts" setup>
-import { ref, onMounted, onBeforeUnmount, onBeforeMount } from "vue"
+import { ref, onMounted, onBeforeUnmount, onBeforeMount, watch } from "vue"
 import { safelyExtractRESTRequest } from "@hoppscotch/data"
 import { translateExtURLParams } from "~/helpers/RESTExtURLParams"
 import { useRoute } from "vue-router"
@@ -136,6 +136,12 @@ import {
   changeCurrentSyncStatus,
   currentSyncingStatus$,
 } from "~/newstore/syncing"
+import { useService } from "dioc/vue"
+import { InspectionService } from "~/services/inspection"
+import { HeaderInspectorService } from "~/services/inspection/inspectors/header.inspector"
+import { EnvironmentInspectorService } from "~/services/inspection/inspectors/environment.inspector"
+import { URLInspectorService } from "~/services/inspection/inspectors/url.inspector"
+import { ResponseInspectorService } from "~/services/inspection/inspectors/response.inspector"
 
 const savingRequest = ref(false)
 const confirmingCloseForTabID = ref<string | null>(null)
@@ -215,6 +221,7 @@ const removeTab = (tabID: string) => {
     confirmingCloseForTabID.value = tabID
   } else {
     closeTab(tab.value.id)
+    inspectionService.deleteTabInspectorResult(tab.value.id)
   }
 }
 
@@ -271,6 +278,7 @@ const renameReqName = () => {
 const onCloseConfirmSaveTab = () => {
   if (!savingRequest.value && confirmingCloseForTabID.value) {
     closeTab(confirmingCloseForTabID.value)
+    inspectionService.deleteTabInspectorResult(confirmingCloseForTabID.value)
     confirmingCloseForTabID.value = null
   }
 }
@@ -449,4 +457,18 @@ oAuthURL()
 defineActionHandler("rest.request.open", ({ doc }) => {
   createNewTab(doc)
 })
+
+const inspectionService = useService(InspectionService)
+useService(HeaderInspectorService)
+useService(EnvironmentInspectorService)
+useService(URLInspectorService)
+useService(ResponseInspectorService)
+
+watch(
+  () => currentTabID.value,
+  () => {
+    inspectionService.initializeTabInspectors()
+  },
+  { immediate: true }
+)
 </script>

packages/hoppscotch-common/src/services/inspection/__tests__/index.spec.ts

@@ -0,0 +1,54 @@
+import { describe, it, expect } from "vitest"
+import { Inspector, InspectionService, InspectorResult } from "../"
+import { TestContainer } from "dioc/testing"
+
+const inspectorResultMock: InspectorResult[] = [
+  {
+    id: "result1",
+    text: { type: "text", text: "Sample Text" },
+    icon: {},
+    isApplicable: true,
+    severity: 2,
+    locations: { type: "url" },
+    doc: { text: "Sample Doc", link: "https://example.com" },
+    action: {
+      text: "Sample Action",
+      // eslint-disable-next-line @typescript-eslint/no-empty-function
+      apply: () => {},
+    },
+  },
+]
+
+const testInspector: Inspector = {
+  inspectorID: "inspector1",
+  getInspectorFor: () => inspectorResultMock,
+}
+
+describe("InspectionService", () => {
+  describe("registerInspector", () => {
+    it("should register an inspector", () => {
+      const container = new TestContainer()
+      const service = container.bind(InspectionService)
+
+      service.registerInspector(testInspector)
+
+      expect(service.inspectors.has(testInspector.inspectorID)).toEqual(true)
+    })
+  })
+
+  describe("deleteTabInspectorResult", () => {
+    it("should delete a tab's inspector results", () => {
+      const container = new TestContainer()
+      const service = container.bind(InspectionService)
+
+      const tabID = "testTab"
+      service.tabs.value.set(tabID, inspectorResultMock)
+
+      expect(service.tabs.value.has(tabID)).toEqual(true)
+
+      service.deleteTabInspectorResult(tabID)
+
+      expect(service.tabs.value.has(tabID)).toEqual(false)
+    })
+  })
+})

packages/hoppscotch-common/src/services/inspection/index.ts

@@ -0,0 +1,135 @@
+import { HoppRESTRequest } from "@hoppscotch/data"
+import { Service } from "dioc"
+import { Component, Ref, ref, watch } from "vue"
+import { currentActiveTab, currentTabID } from "~/helpers/rest/tab"
+import { HoppRESTResponse } from "~/helpers/types/HoppRESTResponse"
+
+/**
+ * Defines how to render the text in an Inspector Result
+ */
+export type InspectorTextType<T extends object | Component = never> =
+  | {
+      type: "text"
+      text: string[] | string
+    }
+  | {
+      type: "custom"
+      component: T
+      componentProps: T extends Component<infer Props> ? Props : never
+    }
+
+export type InspectorLocation =
+  | {
+      type: "url"
+    }
+  | {
+      type: "header"
+      position: "key" | "value"
+      key?: string
+      index?: number
+    }
+  | {
+      type: "parameter"
+      position: "key" | "value"
+      key?: string
+      index?: number
+    }
+  | {
+      type: "body"
+      key: string
+      index: number
+    }
+  | {
+      type: "response"
+    }
+
+/**
+ * Defines info about an inspector result so the UI can render it
+ */
+export interface InspectorResult {
+  id: string
+  text: InspectorTextType<any>
+  icon: object | Component
+  severity: number
+  isApplicable: boolean
+  action?: {
+    text: string
+    apply: () => void
+  }
+  doc: {
+    text: string
+    link: string
+  }
+  locations: InspectorLocation
+}
+
+/**
+ * Defines the state of the inspector service
+ */
+export type InspectorState = {
+  results: InspectorResult[]
+}
+
+/**
+ * Defines an inspector that can be registered with the inspector service
+ * Inspectors are used to perform checks on a request and return the results
+ */
+export interface Inspector {
+  /**
+   * The unique ID of the inspector
+   */
+  inspectorID: string
+  /**
+   * Returns the inspector results for the request
+   * @param req The request to inspect
+   * @param res The response to inspect
+   * @returns The inspector results
+   */
+  getInspectorFor: (
+    req: HoppRESTRequest,
+    res?: HoppRESTResponse
+  ) => InspectorResult[]
+}
+
+/**
+ * Defines the inspection service
+ * The service watches the current active tab and returns the inspector results for the request and response
+ */
+export class InspectionService extends Service {
+  public static readonly ID = "INSPECTION_SERVICE"
+
+  private inspectors: Map<string, Inspector> = new Map()
+
+  public tabs: Ref<Map<string, InspectorResult[]>> = ref(new Map())
+
+  /**
+   * Registers a inspector with the inspection service
+   * @param inspector The inspector instance to register
+   */
+  public registerInspector(inspector: Inspector) {
+    this.inspectors.set(inspector.inspectorID, inspector)
+  }
+
+  public initializeTabInspectors() {
+    watch(
+      currentActiveTab.value,
+      (tab) => {
+        if (!tab) return
+        const req = currentActiveTab.value.document.request
+        const res = currentActiveTab.value.response
+        const inspectors = Array.from(this.inspectors.values()).map((x) =>
+          x.getInspectorFor(req, res)
+        )
+        this.tabs.value.set(
+          currentTabID.value,
+          inspectors.flatMap((x) => x)
+        )
+      },
+      { immediate: true, deep: true }
+    )
+  }
+
+  public deleteTabInspectorResult(tabID: string) {
+    this.tabs.value.delete(tabID)
+  }
+}

packages/hoppscotch-common/src/services/inspection/inspectors/__tests__/environment.inspector.spec.ts

@@ -0,0 +1,158 @@
+import { TestContainer } from "dioc/testing"
+import { describe, expect, it, vi } from "vitest"
+import { EnvironmentInspectorService } from "../environment.inspector"
+import { InspectionService } from "../../index"
+import { getDefaultRESTRequest } from "~/helpers/rest/default"
+
+vi.mock("~/modules/i18n", () => ({
+  __esModule: true,
+  getI18n: () => (x: string) => x,
+}))
+
+vi.mock("~/newstore/environments", () => ({
+  __esModule: true,
+  getAggregateEnvs: () => [{ key: "EXISTING_ENV_VAR", value: "test_value" }],
+}))
+
+describe("EnvironmentInspectorService", () => {
+  it("registers with the inspection service upon initialization", () => {
+    const container = new TestContainer()
+
+    const registerInspectorFn = vi.fn()
+
+    container.bindMock(InspectionService, {
+      registerInspector: registerInspectorFn,
+    })
+
+    const envInspector = container.bind(EnvironmentInspectorService)
+
+    expect(registerInspectorFn).toHaveBeenCalledOnce()
+    expect(registerInspectorFn).toHaveBeenCalledWith(envInspector)
+  })
+
+  describe("getInspectorFor", () => {
+    it("should return an inspector result when the URL contains undefined environment variables", () => {
+      const container = new TestContainer()
+      const envInspector = container.bind(EnvironmentInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "<<UNDEFINED_ENV_VAR>>",
+      }
+
+      const result = envInspector.getInspectorFor(req)
+
+      expect(result).toContainEqual(
+        expect.objectContaining({
+          id: "environment",
+          isApplicable: true,
+          text: {
+            type: "text",
+            text: "inspections.environment.not_found",
+          },
+        })
+      )
+    })
+
+    it("should not return an inspector result when the URL contains defined environment variables", () => {
+      const container = new TestContainer()
+      const envInspector = container.bind(EnvironmentInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "<<EXISTING_ENV_VAR>>",
+      }
+
+      const result = envInspector.getInspectorFor(req)
+
+      expect(result).toHaveLength(0)
+    })
+
+    it("should return an inspector result when the headers contain undefined environment variables", () => {
+      const container = new TestContainer()
+      const envInspector = container.bind(EnvironmentInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://example.com/api/data",
+        headers: [
+          { key: "<<UNDEFINED_ENV_VAR>>", value: "some-value", active: true },
+        ],
+      }
+
+      const result = envInspector.getInspectorFor(req)
+
+      expect(result).toContainEqual(
+        expect.objectContaining({
+          id: "environment",
+          isApplicable: true,
+          text: {
+            type: "text",
+            text: "inspections.environment.not_found",
+          },
+        })
+      )
+    })
+
+    it("should not return an inspector result when the headers contain defined environment variables", () => {
+      const container = new TestContainer()
+      const envInspector = container.bind(EnvironmentInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://example.com/api/data",
+        headers: [
+          { key: "<<EXISTING_ENV_VAR>>", value: "some-value", active: true },
+        ],
+      }
+
+      const result = envInspector.getInspectorFor(req)
+
+      expect(result).toHaveLength(0)
+    })
+
+    it("should return an inspector result when the params contain undefined environment variables", () => {
+      const container = new TestContainer()
+      const envInspector = container.bind(EnvironmentInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://example.com/api/data",
+        params: [
+          { key: "<<UNDEFINED_ENV_VAR>>", value: "some-value", active: true },
+        ],
+      }
+
+      const result = envInspector.getInspectorFor(req)
+
+      expect(result).toContainEqual(
+        expect.objectContaining({
+          id: "environment",
+          isApplicable: true,
+          text: {
+            type: "text",
+            text: "inspections.environment.not_found",
+          },
+        })
+      )
+    })
+
+    it("should not return an inspector result when the params contain defined environment variables", () => {
+      const container = new TestContainer()
+      const envInspector = container.bind(EnvironmentInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://example.com/api/data",
+        headers: [],
+        params: [
+          { key: "<<EXISTING_ENV_VAR>>", value: "some-value", active: true },
+        ],
+      }
+
+      const result = envInspector.getInspectorFor(req)
+
+      expect(result).toHaveLength(0)
+    })
+  })
+})

packages/hoppscotch-common/src/services/inspection/inspectors/__tests__/header.inspector.spec.ts

@@ -0,0 +1,61 @@
+import { TestContainer } from "dioc/testing"
+import { describe, expect, it, vi } from "vitest"
+import { HeaderInspectorService } from "../header.inspector"
+import { InspectionService } from "../../index"
+import { getDefaultRESTRequest } from "~/helpers/rest/default"
+
+vi.mock("~/modules/i18n", () => ({
+  __esModule: true,
+  getI18n: () => (x: string) => x,
+}))
+
+describe("HeaderInspectorService", () => {
+  it("registers with the inspection service upon initialization", () => {
+    const container = new TestContainer()
+
+    const registerInspectorFn = vi.fn()
+
+    container.bindMock(InspectionService, {
+      registerInspector: registerInspectorFn,
+    })
+
+    const headerInspector = container.bind(HeaderInspectorService)
+
+    expect(registerInspectorFn).toHaveBeenCalledOnce()
+    expect(registerInspectorFn).toHaveBeenCalledWith(headerInspector)
+  })
+
+  describe("getInspectorFor", () => {
+    it("should return an inspector result when headers contain cookies", () => {
+      const container = new TestContainer()
+      const headerInspector = container.bind(HeaderInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://example.com/api/data",
+        headers: [{ key: "Cookie", value: "some-cookie", active: true }],
+      }
+
+      const result = headerInspector.getInspectorFor(req)
+
+      expect(result).toContainEqual(
+        expect.objectContaining({ id: "header", isApplicable: true })
+      )
+    })
+
+    it("should return an empty array when headers do not contain cookies", () => {
+      const container = new TestContainer()
+      const headerInspector = container.bind(HeaderInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://example.com/api/data",
+        headers: [{ key: "Authorization", value: "Bearer abcd", active: true }],
+      }
+
+      const result = headerInspector.getInspectorFor(req)
+
+      expect(result).toHaveLength(0)
+    })
+  })
+})

packages/hoppscotch-common/src/services/inspection/inspectors/__tests__/response.interceptor.spec.ts

@@ -0,0 +1,151 @@
+import { TestContainer } from "dioc/testing"
+import { describe, expect, it, vi } from "vitest"
+import { ResponseInspectorService } from "../response.inspector"
+import { InspectionService } from "../../index"
+import { getDefaultRESTRequest } from "~/helpers/rest/default"
+
+vi.mock("~/modules/i18n", () => ({
+  __esModule: true,
+  getI18n: () => (x: string) => x,
+}))
+
+describe("ResponseInspectorService", () => {
+  it("registers with the inspection service upon initialization", () => {
+    const container = new TestContainer()
+
+    const registerInspectorFn = vi.fn()
+
+    container.bindMock(InspectionService, {
+      registerInspector: registerInspectorFn,
+    })
+
+    const responseInspector = container.bind(ResponseInspectorService)
+
+    expect(registerInspectorFn).toHaveBeenCalledOnce()
+    expect(registerInspectorFn).toHaveBeenCalledWith(responseInspector)
+  })
+
+  describe("getInspectorFor", () => {
+    it("should return an empty array when response is undefined", () => {
+      const container = new TestContainer()
+      const responseInspector = container.bind(ResponseInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://example.com/api/data",
+      }
+
+      const result = responseInspector.getInspectorFor(req, undefined)
+
+      expect(result).toHaveLength(0)
+    })
+
+    it("should return an inspector result when response type is not success or status code is not 200", () => {
+      const container = new TestContainer()
+      const responseInspector = container.bind(ResponseInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://example.com/api/data",
+      }
+      const res = { type: "network_fail", statusCode: 400 }
+
+      const result = responseInspector.getInspectorFor(req, res)
+
+      expect(result).toContainEqual(
+        expect.objectContaining({ id: "url", isApplicable: true })
+      )
+    })
+
+    it("should handle network_fail responses", () => {
+      const container = new TestContainer()
+      const responseInspector = container.bind(ResponseInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://example.com/api/data",
+      }
+      const res = { type: "network_fail", statusCode: 500 }
+
+      const result = responseInspector.getInspectorFor(req, res)
+
+      expect(result).toContainEqual(
+        expect.objectContaining({
+          text: { type: "text", text: "inspections.response.network_error" },
+        })
+      )
+    })
+
+    it("should handle fail responses", () => {
+      const container = new TestContainer()
+      const responseInspector = container.bind(ResponseInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://example.com/api/data",
+      }
+      const res = { type: "fail", statusCode: 500 }
+
+      const result = responseInspector.getInspectorFor(req, res)
+
+      expect(result).toContainEqual(
+        expect.objectContaining({
+          text: { type: "text", text: "inspections.response.default_error" },
+        })
+      )
+    })
+
+    it("should handle 404 responses", () => {
+      const container = new TestContainer()
+      const responseInspector = container.bind(ResponseInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://example.com/api/data",
+      }
+      const res = { type: "success", statusCode: 404 }
+
+      const result = responseInspector.getInspectorFor(req, res)
+
+      expect(result).toContainEqual(
+        expect.objectContaining({
+          text: { type: "text", text: "inspections.response.404_error" },
+        })
+      )
+    })
+
+    it("should handle 401 responses", () => {
+      const container = new TestContainer()
+      const responseInspector = container.bind(ResponseInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://example.com/api/data",
+      }
+      const res = { type: "success", statusCode: 401 }
+
+      const result = responseInspector.getInspectorFor(req, res)
+
+      expect(result).toContainEqual(
+        expect.objectContaining({
+          text: { type: "text", text: "inspections.response.401_error" },
+        })
+      )
+    })
+
+    it("should handle successful responses", () => {
+      const container = new TestContainer()
+      const responseInspector = container.bind(ResponseInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://example.com/api/data",
+      }
+      const res = { type: "success", statusCode: 200 }
+
+      const result = responseInspector.getInspectorFor(req, res)
+
+      expect(result).toHaveLength(0)
+    })
+  })
+})

packages/hoppscotch-common/src/services/inspection/inspectors/__tests__/url.inspector.spec.ts

@@ -0,0 +1,84 @@
+import { TestContainer } from "dioc/testing"
+import { describe, expect, it, vi } from "vitest"
+import { URLInspectorService } from "../url.inspector"
+import { InspectionService } from "../../index"
+import { getDefaultRESTRequest } from "~/helpers/rest/default"
+
+vi.mock("~/modules/i18n", () => ({
+  __esModule: true,
+  getI18n: () => (x: string) => x,
+}))
+
+describe("URLInspectorService", () => {
+  it("registers with the inspection service upon initialization", () => {
+    const container = new TestContainer()
+
+    const registerInspectorFn = vi.fn()
+
+    container.bindMock(InspectionService, {
+      registerInspector: registerInspectorFn,
+    })
+
+    const urlInspector = container.bind(URLInspectorService)
+
+    expect(registerInspectorFn).toHaveBeenCalledOnce()
+    expect(registerInspectorFn).toHaveBeenCalledWith(urlInspector)
+  })
+
+  describe("getInspectorFor", () => {
+    it("should return an inspector result when localhost is in URL and extension is not available", () => {
+      const container = new TestContainer()
+      const urlInspector = container.bind(URLInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://localhost:8000/api/data",
+      }
+
+      const result = urlInspector.getInspectorFor(req)
+
+      expect(result).toContainEqual(
+        expect.objectContaining({ id: "url", isApplicable: true })
+      )
+    })
+
+    it("should not return an inspector result when localhost is not in URL", () => {
+      const container = new TestContainer()
+      const urlInspector = container.bind(URLInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://example.com/api/data",
+      }
+
+      const result = urlInspector.getInspectorFor(req)
+
+      expect(result).toHaveLength(0)
+    })
+
+    it("should add the correct text to the results when extension is not installed", () => {
+      vi.mock("~/newstore/HoppExtension", async () => {
+        const { BehaviorSubject }: any = await vi.importActual("rxjs")
+
+        return {
+          __esModule: true,
+          extensionStatus$: new BehaviorSubject("waiting"),
+        }
+      })
+      const container = new TestContainer()
+      const urlInspector = container.bind(URLInspectorService)
+
+      const req = {
+        ...getDefaultRESTRequest(),
+        endpoint: "http://localhost:8000/api/data",
+      }
+
+      const result = urlInspector.getInspectorFor(req)
+
+      expect(result).toHaveLength(1)
+      expect(result[0]).toMatchObject({
+        text: { type: "text", text: "inspections.url.extension_not_installed" },
+      })
+    })
+  })
+})

packages/hoppscotch-common/src/services/inspection/inspectors/environment.inspector.ts

@@ -0,0 +1,167 @@
+import { getI18n } from "~/modules/i18n"
+import {
+  InspectionService,
+  Inspector,
+  InspectorLocation,
+  InspectorResult,
+} from ".."
+import { Service } from "dioc"
+import { Ref, markRaw, ref } from "vue"
+import IconPlusCircle from "~icons/lucide/plus-circle"
+import { HoppRESTRequest } from "@hoppscotch/data"
+import { getAggregateEnvs } from "~/newstore/environments"
+import { invokeAction } from "~/helpers/actions"
+
+const HOPP_ENVIRONMENT_REGEX = /(<<[a-zA-Z0-9-_]+>>)/g
+
+const isENVInString = (str: string) => {
+  return HOPP_ENVIRONMENT_REGEX.test(str)
+}
+
+/**
+ * This inspector is responsible for inspecting the environment variables of a input.
+ * It checks if the environment variables are defined in the environment.
+ * It also provides an action to add the environment variable.
+ *
+ * NOTE: Initializing this service registers it as a inspector with the Inspection Service.
+ */
+export class EnvironmentInspectorService extends Service implements Inspector {
+  public static readonly ID = "ENVIRONMENT_INSPECTOR_SERVICE"
+
+  private t = getI18n()
+
+  public readonly inspectorID = "environment"
+
+  private readonly inspection = this.bind(InspectionService)
+
+  constructor() {
+    super()
+
+    this.inspection.registerInspector(this)
+  }
+
+  /**
+   * Validates the environment variables in the target array
+   * @param target The target array to validate
+   * @param results The results array to push the results to
+   * @param locations The location where results are to be displayed
+   * @returns The results array
+   */
+  private validateEnvironmentVariables = (
+    target: any[],
+    results: Ref<InspectorResult[]>,
+    locations: InspectorLocation
+  ) => {
+    const env = getAggregateEnvs()
+    const envKeys = env.map((e) => e.key)
+
+    target.forEach((element, index) => {
+      if (isENVInString(element)) {
+        const extractedEnv = element.match(HOPP_ENVIRONMENT_REGEX)
+
+        if (extractedEnv) {
+          extractedEnv.forEach((exEnv: string) => {
+            const formattedExEnv = exEnv.slice(2, -2)
+            let itemLocation: InspectorLocation
+            if (locations.type === "header") {
+              itemLocation = {
+                type: "header",
+                position: locations.position,
+                index: index,
+                key: element,
+              }
+            } else if (locations.type === "parameter") {
+              itemLocation = {
+                type: "parameter",
+                position: locations.position,
+                index: index,
+                key: element,
+              }
+            } else {
+              itemLocation = {
+                type: "url",
+              }
+            }
+            if (!envKeys.includes(formattedExEnv)) {
+              results.value.push({
+                id: "environment",
+                text: {
+                  type: "text",
+                  text: this.t("inspections.environment.not_found", {
+                    environment: exEnv,
+                  }),
+                },
+                icon: markRaw(IconPlusCircle),
+                action: {
+                  text: this.t("inspections.environment.add_environment"),
+                  apply: () => {
+                    invokeAction("modals.environment.add", {
+                      envName: "test",
+                      variableName: formattedExEnv,
+                    })
+                  },
+                },
+                severity: 3,
+                isApplicable: true,
+                locations: itemLocation,
+                doc: {
+                  text: this.t("action.learn_more"),
+                  link: "https://docs.hoppscotch.io/",
+                },
+              })
+            }
+          })
+        }
+      }
+    })
+  }
+
+  /**
+   * Returns the inspector results for the request
+   * It checks if any env is used in the request ie, url, headers, params
+   * and checks if the env is defined in the environment using the validateEnvironmentVariables function
+   * @param req The request to inspect
+   * @returns The inspector results
+   */
+  getInspectorFor(req: HoppRESTRequest): InspectorResult[] {
+    const results = ref<InspectorResult[]>([])
+
+    const headers = req.headers
+
+    const params = req.params
+
+    this.validateEnvironmentVariables([req.endpoint], results, {
+      type: "url",
+    })
+
+    const headerKeys = Object.values(headers).map((header) => header.key)
+
+    this.validateEnvironmentVariables(headerKeys, results, {
+      type: "header",
+      position: "key",
+    })
+
+    const headerValues = Object.values(headers).map((header) => header.value)
+
+    this.validateEnvironmentVariables(headerValues, results, {
+      type: "header",
+      position: "value",
+    })
+
+    const paramsKeys = Object.values(params).map((param) => param.key)
+
+    this.validateEnvironmentVariables(paramsKeys, results, {
+      type: "parameter",
+      position: "key",
+    })
+
+    const paramsValues = Object.values(params).map((param) => param.value)
+
+    this.validateEnvironmentVariables(paramsValues, results, {
+      type: "parameter",
+      position: "value",
+    })
+
+    return results.value
+  }
+}

packages/hoppscotch-common/src/services/inspection/inspectors/header.inspector.ts

@@ -0,0 +1,78 @@
+import { Service } from "dioc"
+import { InspectionService, Inspector, InspectorResult } from ".."
+import { getI18n } from "~/modules/i18n"
+import { HoppRESTRequest } from "@hoppscotch/data"
+import { markRaw, ref } from "vue"
+import IconAlertTriangle from "~icons/lucide/alert-triangle"
+
+/**
+ * This inspector is responsible for inspecting the header of a request.
+ * It checks if the header contains cookies.
+ *
+ * NOTE: Initializing this service registers it as a inspector with the Inspection Service.
+ */
+export class HeaderInspectorService extends Service implements Inspector {
+  public static readonly ID = "HEADER_INSPECTOR_SERVICE"
+
+  private t = getI18n()
+
+  public readonly inspectorID = "header"
+
+  private readonly inspection = this.bind(InspectionService)
+
+  constructor() {
+    super()
+
+    this.inspection.registerInspector(this)
+  }
+
+  /**
+   * Checks if the header contains cookies
+   * @param req The request to inspect
+   * @returns The inspector results
+   */
+  getInspectorFor(req: HoppRESTRequest): InspectorResult[] {
+    const results = ref<InspectorResult[]>([])
+
+    const cookiesCheck = (headerKey: string) => {
+      const cookieKeywords = ["Cookie", "Set-Cookie", "Cookie2", "Set-Cookie2"]
+
+      return cookieKeywords.includes(headerKey)
+    }
+
+    const headers = req.headers
+
+    const headerKeys = Object.values(headers).map((header) => header.key)
+
+    const isContainCookies = headerKeys.includes("Cookie")
+
+    if (isContainCookies) {
+      headerKeys.forEach((headerKey, index) => {
+        if (cookiesCheck(headerKey)) {
+          results.value.push({
+            id: "header",
+            icon: markRaw(IconAlertTriangle),
+            text: {
+              type: "text",
+              text: this.t("inspections.header.cookie"),
+            },
+            severity: 2,
+            isApplicable: true,
+            locations: {
+              type: "header",
+              position: "key",
+              key: headerKey,
+              index: index,
+            },
+            doc: {
+              text: this.t("action.learn_more"),
+              link: "https://docs.hoppscotch.io/",
+            },
+          })
+        }
+      })
+    }
+
+    return results.value
+  }
+}

packages/hoppscotch-common/src/services/inspection/inspectors/response.inspector.ts

@@ -0,0 +1,73 @@
+import { Service } from "dioc"
+import { InspectionService, Inspector, InspectorResult } from ".."
+import { getI18n } from "~/modules/i18n"
+import { HoppRESTRequest } from "@hoppscotch/data"
+import { markRaw, ref } from "vue"
+import IconAlertTriangle from "~icons/lucide/alert-triangle"
+import { HoppRESTResponse } from "~/helpers/types/HoppRESTResponse"
+
+/**
+ * This inspector is responsible for inspecting the response of a request.
+ * It checks if the response is successful and if it contains errors.
+ *
+ * NOTE: Initializing this service registers it as a inspector with the Inspection Service.
+ */
+export class ResponseInspectorService extends Service implements Inspector {
+  public static readonly ID = "RESPONSE_INSPECTOR_SERVICE"
+
+  private t = getI18n()
+
+  public readonly inspectorID = "response"
+
+  private readonly inspection = this.bind(InspectionService)
+
+  constructor() {
+    super()
+
+    this.inspection.registerInspector(this)
+  }
+
+  getInspectorFor(
+    req: HoppRESTRequest,
+    res: HoppRESTResponse | undefined
+  ): InspectorResult[] {
+    const results = ref<InspectorResult[]>([])
+    if (!res) return results.value
+
+    const hasErrors = res && (res.type !== "success" || res.statusCode !== 200)
+
+    let text
+
+    if (res.type === "network_fail") {
+      text = this.t("inspections.response.network_error")
+    } else if (res.type === "fail") {
+      text = this.t("inspections.response.default_error")
+    } else if (res.type === "success" && res.statusCode === 404) {
+      text = this.t("inspections.response.404_error")
+    } else if (res.type === "success" && res.statusCode === 401) {
+      text = this.t("inspections.response.401_error")
+    }
+
+    if (hasErrors && text) {
+      results.value.push({
+        id: "url",
+        icon: markRaw(IconAlertTriangle),
+        text: {
+          type: "text",
+          text: text,
+        },
+        severity: 2,
+        isApplicable: true,
+        locations: {
+          type: "response",
+        },
+        doc: {
+          text: this.t("action.learn_more"),
+          link: "https://docs.hoppscotch.io/",
+        },
+      })
+    }
+
+    return results.value
+  }
+}

packages/hoppscotch-common/src/services/inspection/inspectors/url.inspector.ts

@@ -0,0 +1,96 @@
+import { Service } from "dioc"
+import { InspectionService, Inspector, InspectorResult } from ".."
+import { getI18n } from "~/modules/i18n"
+import { HoppRESTRequest } from "@hoppscotch/data"
+import { computed, markRaw, ref } from "vue"
+import IconAlertTriangle from "~icons/lucide/alert-triangle"
+import { useReadonlyStream } from "~/composables/stream"
+import { extensionStatus$ } from "~/newstore/HoppExtension"
+import { useSetting } from "~/composables/settings"
+import { applySetting, toggleSetting } from "~/newstore/settings"
+
+/**
+ * This inspector is responsible for inspecting the URL of a request.
+ * It checks if the URL contains localhost and if the extension is installed.
+ * It also provides an action to enable the extension.
+ *
+ * NOTE: Initializing this service registers it as a inspector with the Inspection Service.
+ */
+export class URLInspectorService extends Service implements Inspector {
+  public static readonly ID = "URL_INSPECTOR_SERVICE"
+
+  private t = getI18n()
+
+  public readonly inspectorID = "url"
+
+  private readonly inspection = this.bind(InspectionService)
+
+  constructor() {
+    super()
+
+    this.inspection.registerInspector(this)
+  }
+
+  getInspectorFor(req: HoppRESTRequest): InspectorResult[] {
+    const PROXY_ENABLED = useSetting("PROXY_ENABLED")
+
+    const currentExtensionStatus = useReadonlyStream(extensionStatus$, null)
+
+    const isExtensionInstalled = computed(() => {
+      return currentExtensionStatus.value === "available"
+    })
+    const EXTENSIONS_ENABLED = useSetting("EXTENSIONS_ENABLED")
+
+    const results = ref<InspectorResult[]>([])
+
+    const url = req.endpoint
+
+    const isContainLocalhost = url.includes("localhost")
+
+    if (
+      isContainLocalhost &&
+      (!EXTENSIONS_ENABLED.value || !isExtensionInstalled.value)
+    ) {
+      let text
+
+      if (!isExtensionInstalled.value) {
+        if (currentExtensionStatus.value === "unknown-origin") {
+          text = this.t("inspections.url.extension_unknown_origin")
+        } else {
+          text = this.t("inspections.url.extension_not_installed")
+        }
+      } else if (!EXTENSIONS_ENABLED.value) {
+        text = this.t("inspections.url.extention_not_enabled")
+      } else {
+        text = this.t("inspections.url.localhost")
+      }
+
+      results.value.push({
+        id: "url",
+        icon: markRaw(IconAlertTriangle),
+        text: {
+          type: "text",
+          text: text,
+        },
+        action: {
+          text: this.t("inspections.url.extention_enable_action"),
+          apply: () => {
+            applySetting("EXTENSIONS_ENABLED", true)
+            if (PROXY_ENABLED.value) toggleSetting("PROXY_ENABLED")
+          },
+        },
+        severity: 2,
+        isApplicable: true,
+        locations: {
+          type: "url",
+        },
+        doc: {
+          text: this.t("action.learn_more"),
+          link: "https://docs.hoppscotch.io/",
+        },
+      })
+    }
+
+    return results.value
+  }
+}