feat: Add PostHog

apps/web/app/(app)/environments/[environmentId]/surveys/[surveyId]/components/CustomFilter.tsx

@@ -18,6 +18,7 @@ import {
 } from "date-fns";
 import { TFunction } from "i18next";
 import { Loader2 } from "lucide-react";
+import posthog from "posthog-js";
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import toast from "react-hot-toast";
 import { useTranslation } from "react-i18next";
@@ -252,6 +253,12 @@ export const CustomFilter = ({ survey }: CustomFilterProps) => {
       });
 
       if (responsesDownloadUrlResponse?.data) {
+        posthog.capture("responses_exported", {
+          survey_id: survey.id,
+          survey_name: survey.name,
+          file_type: fileType,
+          filter_type: filter,
+        });
         downloadResponsesFile(
           responsesDownloadUrlResponse.data.fileName,
           responsesDownloadUrlResponse.data.fileContents,

apps/web/app/api/v2/client/[environmentId]/responses/route.ts

@@ -8,6 +8,7 @@ import { checkSurveyValidity } from "@/app/api/v2/client/[environmentId]/respons
 import { responses } from "@/app/lib/api/response";
 import { transformErrorToDetails } from "@/app/lib/api/validator";
 import { sendToPipeline } from "@/app/lib/pipelines";
+import { getPostHogClient } from "@/lib/posthog-server";
 import { getSurvey } from "@/lib/survey/service";
 import { getElementsFromBlocks } from "@/lib/survey/utils";
 import { getClientIpFromHeaders } from "@/lib/utils/client-ip";
@@ -173,6 +174,21 @@ export const POST = async (request: Request, context: Context): Promise<Response
       surveyId: responseData.surveyId,
       response: responseData,
     });
+
+    try {
+      const posthogServer = getPostHogClient();
+      posthogServer.capture({
+        distinctId: environmentId,
+        event: "survey_response_finished",
+        properties: {
+          survey_id: responseData.surveyId,
+          response_id: responseData.id,
+          environment_id: environmentId,
+        },
+      });
+    } catch {
+      // non-critical, don't block the response
+    }
   }
 
   const quotaObj = createQuotaFullObject(quotaFull);

apps/web/instrumentation-client.ts

@@ -0,0 +1,9 @@
+import posthog from "posthog-js";
+
+posthog.init(process.env.NEXT_PUBLIC_POSTHOG_KEY!, {
+  api_host: "/ingest",
+  ui_host: "https://eu.posthog.com",
+  defaults: "2026-01-30",
+  capture_exceptions: true,
+  debug: process.env.NODE_ENV === "development",
+});

apps/web/lib/posthog-server.ts

@@ -0,0 +1,20 @@
+import { PostHog } from "posthog-node";
+
+let posthogClient: PostHog | null = null;
+
+export function getPostHogClient(): PostHog {
+  if (!posthogClient) {
+    posthogClient = new PostHog(process.env.NEXT_PUBLIC_POSTHOG_KEY!, {
+      host: process.env.NEXT_PUBLIC_POSTHOG_HOST,
+      flushAt: 1,
+      flushInterval: 0,
+    });
+  }
+  return posthogClient;
+}
+
+export async function shutdownPostHog(): Promise<void> {
+  if (posthogClient) {
+    await posthogClient.shutdown();
+  }
+}

apps/web/modules/auth/login/components/login-form.tsx

@@ -4,6 +4,7 @@ import { zodResolver } from "@hookform/resolvers/zod";
 import { signIn } from "next-auth/react";
 import Link from "next/dist/client/link";
 import { useRouter, useSearchParams } from "next/navigation";
+import posthog from "posthog-js";
 import { useEffect, useMemo, useRef, useState } from "react";
 import { FormProvider, SubmitHandler, useForm } from "react-hook-form";
 import { toast } from "react-hot-toast";
@@ -119,9 +120,15 @@ export const LoginForm = ({
       }
 
       if (!signInResponse?.error) {
+        posthog.identify(data.email.toLowerCase(), { email: data.email.toLowerCase() });
+        posthog.capture("user_logged_in", {
+          email: data.email.toLowerCase(),
+          method: "email",
+        });
         router.push(searchParams?.get("callbackUrl") ?? "/");
       }
     } catch (error) {
+      posthog.captureException(error);
       toast.error(error.toString());
     }
   };

apps/web/modules/auth/signup/components/signup-form.tsx

@@ -3,6 +3,7 @@
 import { zodResolver } from "@hookform/resolvers/zod";
 import Link from "next/link";
 import { useRouter, useSearchParams } from "next/navigation";
+import posthog from "posthog-js";
 import { useMemo, useState } from "react";
 import { FormProvider, useForm } from "react-hook-form";
 import toast from "react-hot-toast";
@@ -128,6 +129,14 @@ export const SignupForm = ({
         : `/auth/verification-requested?token=${token}`;
 
       if (createUserResponse?.data) {
+        posthog.identify(data.email, { name: data.name, email: data.email });
+        posthog.capture("user_signed_up", {
+          name: data.name,
+          email: data.email,
+          is_formbricks_cloud: isFormbricksCloud,
+          has_invite_token: !!inviteToken,
+          email_verification_disabled: emailVerificationDisabled,
+        });
         router.push(url);
 
         if (!emailTokenActionResponse?.data) {
@@ -149,6 +158,7 @@ export const SignupForm = ({
         toast.error(errorMessage);
       }
     } catch (e: any) {
+      posthog.captureException(e);
       toast.error(e.message);
     }
   };

apps/web/modules/integrations/webhooks/components/add-webhook-modal.tsx

@@ -4,6 +4,7 @@ import { PipelineTriggers, Webhook } from "@prisma/client";
 import clsx from "clsx";
 import { Webhook as WebhookIcon } from "lucide-react";
 import { useRouter } from "next/navigation";
+import posthog from "posthog-js";
 import { useState } from "react";
 import { useForm } from "react-hook-form";
 import toast from "react-hot-toast";
@@ -153,6 +154,11 @@ export const AddWebhookModal = ({ environmentId, surveys, open, setOpen }: AddWe
           webhookSecret: testResult.secret,
         });
         if (createWebhookActionResult?.data) {
+          posthog.capture("webhook_created", {
+            environment_id: environmentId,
+            webhook_triggers: selectedTriggers,
+            survey_count: selectedAllSurveys ? "all" : selectedSurveys.length,
+          });
           router.refresh();
           setCreatedWebhook(createWebhookActionResult.data);
           toast.success(t("environments.integrations.webhooks.webhook_added_successfully"));

apps/web/modules/organization/components/CreateOrganizationModal/index.tsx

@@ -2,6 +2,7 @@
 
 import { PlusCircleIcon } from "lucide-react";
 import { useRouter } from "next/navigation";
+import posthog from "posthog-js";
 import { useState } from "react";
 import { useForm } from "react-hook-form";
 import toast from "react-hot-toast";
@@ -45,6 +46,10 @@ export const CreateOrganizationModal = ({ open, setOpen }: CreateOrganizationMod
     setLoading(true);
     const createOrganizationResponse = await createOrganizationAction({ organizationName: data.name });
     if (createOrganizationResponse?.data) {
+      posthog.capture("organization_created", {
+        organization_id: createOrganizationResponse.data.id,
+        organization_name: data.name,
+      });
       toast.success(t("environments.settings.general.organization_created_successfully"));
       router.push(`/organizations/${createOrganizationResponse.data.id}`);
       setOpen(false);

apps/web/modules/organization/settings/api-keys/components/edit-api-keys.tsx

@@ -2,6 +2,7 @@
 
 import { ApiKeyPermission } from "@prisma/client";
 import { FilesIcon, TrashIcon } from "lucide-react";
+import posthog from "posthog-js";
 import { useState } from "react";
 import toast from "react-hot-toast";
 import { useTranslation } from "react-i18next";
@@ -80,6 +81,10 @@ export const EditAPIKeys = ({ organizationId, apiKeys, locale, isReadOnly, proje
       const updatedApiKeys = [...apiKeysLocal, createApiKeyResponse.data];
       setApiKeysLocal(updatedApiKeys);
       setIsLoading(false);
+      posthog.capture("api_key_created", {
+        organization_id: organizationId,
+        api_key_label: data.label,
+      });
       toast.success(t("environments.workspace.api_keys.api_key_created"));
     } else {
       setIsLoading(false);

apps/web/modules/setup/organization/create/components/create-organization.tsx

@@ -2,6 +2,7 @@
 
 import { zodResolver } from "@hookform/resolvers/zod";
 import { useRouter } from "next/navigation";
+import posthog from "posthog-js";
 import { useState } from "react";
 import { SubmitHandler, useForm } from "react-hook-form";
 import { toast } from "react-hot-toast";
@@ -36,6 +37,11 @@ export const CreateOrganization = () => {
       setIsSubmitting(true);
       const createOrganizationResponse = await createOrganizationAction({ organizationName });
       if (createOrganizationResponse?.data) {
+        posthog.capture("organization_created", {
+          organization_id: createOrganizationResponse.data.id,
+          organization_name: organizationName,
+          source: "setup",
+        });
         router.push(`/setup/organization/${createOrganizationResponse.data.id}/invite`);
       }
     } catch (error) {

apps/web/modules/survey/components/template-list/index.tsx

@@ -2,6 +2,7 @@
 
 import { Project } from "@prisma/client";
 import { useRouter } from "next/navigation";
+import posthog from "posthog-js";
 import { useMemo, useState } from "react";
 import toast from "react-hot-toast";
 import { useTranslation } from "react-i18next";
@@ -64,6 +65,12 @@ export const TemplateList = ({
     });
 
     if (createSurveyResponse?.data) {
+      const eventName = surveyType === "link" ? "link_survey_created" : "in_app_survey_created";
+      posthog.capture(eventName, {
+        survey_id: createSurveyResponse.data.id,
+        template_name: activeTemplate.name,
+        environment_id: environmentId,
+      });
       router.push(`/environments/${environmentId}/surveys/${createSurveyResponse.data.id}/edit`);
     } else {
       const errorMessage = getFormattedErrorMessage(createSurveyResponse);

apps/web/modules/survey/editor/components/how-to-send-card.tsx

@@ -4,6 +4,7 @@ import { useAutoAnimate } from "@formkit/auto-animate/react";
 import { Environment } from "@prisma/client";
 import * as Collapsible from "@radix-ui/react-collapsible";
 import { CheckIcon, LinkIcon, MonitorIcon } from "lucide-react";
+import posthog from "posthog-js";
 import { useEffect, useState } from "react";
 import { useTranslation } from "react-i18next";
 import { TSegment } from "@formbricks/types/segment";
@@ -42,6 +43,12 @@ export const HowToSendCard = ({ localSurvey, setLocalSurvey, environment }: HowT
       endings: endingsTemp,
     }));
 
+    posthog.capture("survey_type_selected", {
+      survey_id: localSurvey.id,
+      survey_type: type,
+      previous_type: localSurvey.type,
+    });
+
     // if the type is "app" and the local survey does not already have a segment, we create a new temporary segment
     if (type === "app" && !localSurvey.segment) {
       const tempSegment: TSegment = {

apps/web/modules/survey/editor/components/survey-menu-bar.tsx

@@ -4,6 +4,7 @@ import { Project } from "@prisma/client";
 import { isEqual } from "lodash";
 import { ArrowLeftIcon, SettingsIcon } from "lucide-react";
 import { useRouter } from "next/navigation";
+import posthog from "posthog-js";
 import { useEffect, useMemo, useRef, useState } from "react";
 import toast from "react-hot-toast";
 import { useTranslation } from "react-i18next";
@@ -391,6 +392,12 @@ export const SurveyMenuBar = ({
       if (updatedSurveyResponse?.data) {
         setLocalSurvey(updatedSurveyResponse.data);
         toast.success(t("environments.surveys.edit.changes_saved"));
+        posthog.capture("survey_saved", {
+          survey_id: localSurvey.id,
+          survey_name: localSurvey.name,
+          survey_type: localSurvey.type,
+          survey_status: localSurvey.status,
+        });
         // Set flag to prevent beforeunload warning during router.refresh()
         isSuccessfullySavedRef.current = true;
         router.refresh();
@@ -402,6 +409,7 @@ export const SurveyMenuBar = ({
 
       return true;
     } catch (e) {
+      posthog.captureException(e);
       console.error(e);
       setIsSurveySaving(false);
       toast.error(t("environments.surveys.edit.error_saving_changes"));
@@ -450,10 +458,16 @@ export const SurveyMenuBar = ({
       }
 
       setIsSurveyPublishing(false);
+      posthog.capture("survey_published", {
+        survey_id: localSurvey.id,
+        survey_name: localSurvey.name,
+        survey_type: localSurvey.type,
+      });
       // Set flag to prevent beforeunload warning during navigation
       isSuccessfullySavedRef.current = true;
       router.push(`/environments/${environmentId}/surveys/${localSurvey.id}/summary?success=true`);
     } catch (error) {
+      posthog.captureException(error);
       console.error(error);
       toast.error(t("environments.surveys.edit.error_publishing_survey"));
       setIsSurveyPublishing(false);

apps/web/modules/survey/list/components/survey-dropdown-menu.tsx

@@ -11,6 +11,7 @@ import {
 } from "lucide-react";
 import Link from "next/link";
 import { useRouter } from "next/navigation";
+import posthog from "posthog-js";
 import { useMemo, useState } from "react";
 import toast from "react-hot-toast";
 import { useTranslation } from "react-i18next";
@@ -74,6 +75,12 @@ export const SurveyDropDownMenu = ({
         toast.error(getFormattedErrorMessage(result));
         return;
       }
+      posthog.capture("survey_deleted", {
+        survey_id: surveyId,
+        survey_name: survey.name,
+        survey_type: survey.type,
+        survey_status: survey.status,
+      });
       deleteSurvey(surveyId);
       toast.success(t("environments.surveys.survey_deleted_successfully"));
     } catch (error) {
@@ -90,6 +97,11 @@ export const SurveyDropDownMenu = ({
       // For single-use surveys, this button is disabled, so we just copy the base link
       const copiedLink = copySurveyLink(surveyLink);
       navigator.clipboard.writeText(copiedLink);
+      posthog.capture("survey_link_copied", {
+        survey_id: survey.id,
+        survey_name: survey.name,
+        survey_type: survey.type,
+      });
       toast.success(t("common.copied_to_clipboard"));
     } catch (error) {
       logger.error(error);
@@ -112,6 +124,13 @@ export const SurveyDropDownMenu = ({
         if (transformedDuplicatedSurvey?.data) {
           onSurveysCopied?.();
         }
+        posthog.capture("survey_duplicated", {
+          original_survey_id: surveyId,
+          new_survey_id: duplicatedSurveyResponse.data.id,
+          survey_name: survey.name,
+          survey_type: survey.type,
+          environment_id: environmentId,
+        });
         toast.success(t("environments.surveys.survey_duplicated_successfully"));
       } else {
         const errorMessage = getFormattedErrorMessage(duplicatedSurveyResponse);

apps/web/next.config.mjs

@@ -404,8 +404,17 @@ const nextConfig = {
       },
     ];
   },
+  skipTrailingSlashRedirect: true,
   async rewrites() {
     return [
+      {
+        source: "/ingest/static/:path*",
+        destination: "https://eu-assets.i.posthog.com/static/:path*",
+      },
+      {
+        source: "/ingest/:path*",
+        destination: "https://eu.i.posthog.com/:path*",
+      },
       {
         source: "/api/packages/website",
         destination: "/js/formbricks.umd.cjs",

apps/web/package.json

@@ -102,6 +102,8 @@
     "nodemailer": "8.0.1",
     "otplib": "12.0.1",
     "papaparse": "5.5.3",
+    "posthog-js": "1.360.0",
+    "posthog-node": "5.28.0",
     "prismjs": "1.30.0",
     "qr-code-styling": "1.9.2",
     "qrcode": "1.5.4",

apps/web/posthog-setup-report.md

@@ -0,0 +1,107 @@
+# PostHog Setup Report
+
+## Overview
+
+PostHog analytics has been integrated into the Formbricks web app (`apps/web`) using the Next.js App Router approach with `instrumentation-client.ts`.
+
+## Configuration
+
+| Setting | Value |
+|---|---|
+| PostHog Host | `https://eu.i.posthog.com` |
+| Reverse Proxy | `/ingest/*` → `https://eu.i.posthog.com/*` |
+| Client Init | `apps/web/instrumentation-client.ts` |
+| Server Client | `apps/web/lib/posthog-server.ts` |
+
+## Environment Variables
+
+Added to `apps/web/.env`:
+
+```
+NEXT_PUBLIC_POSTHOG_KEY=phc_ies97ZFTIL3f8T1sQOTCWQycBzqqPvkPcOkpxYJ1sOA
+NEXT_PUBLIC_POSTHOG_HOST=https://eu.i.posthog.com
+```
+
+## Packages Installed
+
+- `posthog-js` — client-side tracking
+- `posthog-node` — server-side tracking
+
+## Files Modified
+
+### New Files
+
+- **`apps/web/instrumentation-client.ts`** — Client-side PostHog initialization (Next.js 15.3+ App Router pattern)
+- **`apps/web/lib/posthog-server.ts`** — Singleton server-side PostHog client
+
+### Modified Files
+
+- **`apps/web/next.config.mjs`** — Added `skipTrailingSlashRedirect: true` and `/ingest/*` reverse proxy rewrites
+- **`apps/web/modules/auth/signup/components/signup-form.tsx`** — Added `user_signed_up` event + `posthog.identify()`
+- **`apps/web/modules/auth/login/components/login-form.tsx`** — Added `user_logged_in` event + `posthog.identify()`
+- **`apps/web/modules/survey/editor/components/survey-menu-bar.tsx`** — Added `survey_saved` and `survey_published` events
+- **`apps/web/modules/survey/list/components/survey-dropdown-menu.tsx`** — Added `survey_deleted`, `survey_duplicated`, and `survey_link_copied` events
+- **`apps/web/modules/survey/components/template-list/index.tsx`** — Added `link_survey_created` / `in_app_survey_created` events
+- **`apps/web/modules/survey/editor/components/how-to-send-card.tsx`** — Added `survey_type_selected` event
+- **`apps/web/modules/organization/settings/api-keys/components/edit-api-keys.tsx`** — Added `api_key_created` event
+- **`apps/web/modules/organization/components/CreateOrganizationModal/index.tsx`** — Added `organization_created` event
+- **`apps/web/modules/setup/organization/create/components/create-organization.tsx`** — Added `organization_created` event (setup flow)
+- **`apps/web/modules/integrations/webhooks/components/add-webhook-modal.tsx`** — Added `webhook_created` event
+- **`apps/web/app/(app)/environments/[environmentId]/surveys/[surveyId]/components/CustomFilter.tsx`** — Added `responses_exported` event
+- **`apps/web/app/api/v2/client/[environmentId]/responses/route.ts`** — Added server-side `survey_response_finished` event
+
+## Events Tracked
+
+| Event | Location | Properties |
+|---|---|---|
+| `user_signed_up` | `signup-form.tsx` | `name`, `email`, `is_formbricks_cloud`, `has_invite_token`, `email_verification_disabled` |
+| `user_logged_in` | `login-form.tsx` | `email`, `method` |
+| `link_survey_created` | `template-list/index.tsx` | `survey_id`, `template_name`, `environment_id` |
+| `in_app_survey_created` | `template-list/index.tsx` | `survey_id`, `template_name`, `environment_id` |
+| `survey_type_selected` | `how-to-send-card.tsx` | `survey_id`, `survey_type`, `previous_type` |
+| `survey_saved` | `survey-menu-bar.tsx` | `survey_id`, `survey_name`, `survey_type`, `survey_status` |
+| `survey_published` | `survey-menu-bar.tsx` | `survey_id`, `survey_name`, `survey_type` |
+| `survey_deleted` | `survey-dropdown-menu.tsx` | `survey_id`, `survey_name`, `survey_type`, `survey_status` |
+| `survey_duplicated` | `survey-dropdown-menu.tsx` | `original_survey_id`, `new_survey_id`, `survey_name`, `survey_type`, `environment_id` |
+| `survey_link_copied` | `survey-dropdown-menu.tsx` | `survey_id`, `survey_name`, `survey_type` |
+| `survey_response_finished` | `responses/route.ts` (server) | `survey_id`, `response_id`, `environment_id` |
+| `organization_created` | `CreateOrganizationModal`, `create-organization.tsx` | `organization_id`, `organization_name` |
+| `api_key_created` | `edit-api-keys.tsx` | `organization_id`, `api_key_label` |
+| `webhook_created` | `add-webhook-modal.tsx` | `environment_id`, `webhook_triggers`, `survey_count` |
+| `responses_exported` | `CustomFilter.tsx` | `survey_id`, `survey_name`, `file_type`, `filter_type` |
+
+## PostHog Dashboards
+
+### 1. Analytics Basics (ID: 563010)
+
+**URL:** https://eu.posthog.com/project/138028/dashboard/563010
+
+| Insight | Type | URL |
+|---|---|---|
+| User Signups & Logins Over Time | Trends (line) | https://eu.posthog.com/project/138028/insights/vRTZYMqz |
+| Signup to First Survey Published Funnel | Funnel | https://eu.posthog.com/project/138028/insights/SXvzJPQz |
+| Survey Lifecycle Events | Trends (line) — includes `link_survey_created` + `in_app_survey_created` | https://eu.posthog.com/project/138028/insights/8NJpApcm |
+| Survey Engagement Actions | Trends (bar) | https://eu.posthog.com/project/138028/insights/cQRrcfBq |
+| Full User Journey Funnel | Funnel (unordered) — includes both survey creation events | https://eu.posthog.com/project/138028/insights/kFjH9atY |
+| Total Surveys Created | Trends (bar) — combines `link_survey_created` + `in_app_survey_created` | https://eu.posthog.com/project/138028/insights/rAPBfnmR |
+
+### 2. Survey Creation & Types (ID: 563022)
+
+**URL:** https://eu.posthog.com/project/138028/dashboard/563022
+
+| Insight | Type | URL |
+|---|---|---|
+| Link vs In-App Survey Creation | Trends (line) | https://eu.posthog.com/project/138028/insights/QL0LkWoI |
+| Survey Type Selection Distribution | Trends (pie) | https://eu.posthog.com/project/138028/insights/KPSUe2IF |
+| Survey Creation to Response Funnel | Funnel (unordered) — includes both `link_survey_created` + `in_app_survey_created` | https://eu.posthog.com/project/138028/insights/9UPWbBAf |
+| Total Surveys Created | Trends (bar) — combines both events | https://eu.posthog.com/project/138028/insights/rAPBfnmR |
+
+### 3. Integrations & API (ID: 563021)
+
+**URL:** https://eu.posthog.com/project/138028/dashboard/563021
+
+| Insight | Type | URL |
+|---|---|---|
+| Integrations & API Usage | Trends (line) | https://eu.posthog.com/project/138028/insights/ATYgsDY2 |
+| Organizations & Responses Over Time | Trends (line) | https://eu.posthog.com/project/138028/insights/DZVTeqql |
+| Response Export Format Distribution | Trends (bar value) | https://eu.posthog.com/project/138028/insights/00bQNehy |

pnpm-lock.yaml

@@ -360,6 +360,12 @@ importers:
       papaparse:
         specifier: 5.5.3
         version: 5.5.3
+      posthog-js:
+        specifier: 1.360.0
+        version: 1.360.0
+      posthog-node:
+        specifier: 5.28.0
+        version: 5.28.0(rxjs@7.8.2)
       prismjs:
         specifier: 1.30.0
         version: 1.30.0
@@ -2795,6 +2801,12 @@ packages:
     peerDependencies:
       '@opentelemetry/api': '>=1.0.0 <1.10.0'
 
+  '@opentelemetry/core@2.2.0':
+    resolution: {integrity: sha512-FuabnnUm8LflnieVxs6eP7Z383hgQU4W1e3KJS6aOG3RxWxcHyBxH8fDMHNgu/gFx/M2jvTOW/4/PHhLz6bjWw==}
+    engines: {node: ^18.19.0 || >=20.6.0}
+    peerDependencies:
+      '@opentelemetry/api': '>=1.0.0 <1.10.0'
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+      preact: 10.28.2
+      query-selector-shadow-dom: 1.0.1
+      web-vitals: 5.1.0
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