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Integration React React Router 7 Declarative

PostHogOfficialCreated by PostHog

  • Skill
  • Tool integration
  • Automation and integrations
  • MIT
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From the author

PostHog integration for React Router v7 - Declarative mode applications
— the description by PostHog

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

This skill provides a systematic, multi-step process for implementing PostHog analytics, session replay, feature flags, and error tracking within React Router v7 applications. It emphasizes declarative patterns, proper user identification, and the use of environment variables for configuration. The workflow includes a planning phase to identify key business events and ensures that both client-side and server-side tracking are implemented correctly to capture the full user journey.

What it does

  • Guides the integration of PostHog into React Router v7 projects.
  • Provides a structured 4-step workflow for setup, editing, revision, and conclusion.
  • Includes patterns for user identification and error boundary implementation.
  • Offers best practices for event tracking and feature flag usage.
  • Ensures consistent environment variable management for API keys.
  • Supports both client-side event capture and server-side event correlation.

When to use it

  • When adding PostHog analytics to a new or existing React Router v7 project.
  • When you need to implement consistent event tracking across a declarative React application.
  • When you need to correlate client-side sessions with server-side events.
  • When you want to follow established patterns for error tracking and user identification.

Advantages

  • Follows a clear, step-by-step procedure to minimize integration errors.
  • Promotes clean code by separating configuration from business logic.
  • Ensures critical business events are captured on both client and server.
  • Provides standardized patterns for React hooks and error handling.

Usage examples

“How do I start integrating PostHog into my React Router v7 app?”
The agent will initiate the workflow by guiding you through the project analysis and the creation of an event tracking plan.
“Where should I place my PostHog capture calls in a declarative component?”
The agent will advise placing capture calls within event handlers rather than useEffect hooks, following the provided framework guidelines.

Install

  1. Download the skill as a ZIP:

    https://autogineer.com/agent-skills/posthog/integration-react-react-router-7-declarative/download

  2. Unzip it into the cross-client skills folder of your project:

    mkdir -p .agents/skills && unzip integration-react-react-router-7-declarative.zip -d .agents/skills

Documentation by PostHog

PostHog integration for React Router v7 - Declarative mode

This skill helps you add PostHog analytics to React Router v7 - Declarative mode applications.

Workflow

Follow these steps in order to complete the integration:

  1. basic-integration-1.0-begin.md - PostHog Setup - Begin ← Start here

  2. basic-integration-1.1-edit.md - PostHog Setup - Edit

  3. basic-integration-1.2-revise.md - PostHog Setup - Revise

  4. basic-integration-1.3-conclude.md - PostHog Setup - Conclusion

Reference files

  • references/EXAMPLE.md - React Router v7 - Declarative mode example project code

  • references/react-router-v7-declarative-mode.md - React router v7 declarative mode - docs

  • references/identify-users.md - Identify users - docs

  • references/basic-integration-1.0-begin.md - PostHog setup - begin

  • references/basic-integration-1.1-edit.md - PostHog setup - edit

  • references/basic-integration-1.2-revise.md - PostHog setup - revise

  • references/basic-integration-1.3-conclude.md - PostHog setup - conclusion

The example project shows the target implementation pattern. Consult the documentation for API details.

Key principles

  • Environment variables: Always use environment variables for PostHog keys. Never hardcode them.

  • Minimal changes: Add PostHog code alongside existing integrations. Don't replace or restructure existing code.

  • Match the example: Your implementation should follow the example project's patterns as closely as possible.

Framework guidelines

  • For feature flags, use useFeatureFlagEnabled() or useFeatureFlagPayload() hooks - they handle loading states and external sync automatically

  • Add analytics capture in event handlers where user actions occur, NOT in useEffect reacting to state changes

  • Do NOT use useEffect for data transformation - calculate derived values during render instead

  • Do NOT use useEffect to respond to user events - put that logic in the event handler itself

  • Do NOT use useEffect to chain state updates - calculate all related updates together in the event handler

  • Do NOT use useEffect to notify parent components - call the parent callback alongside setState in the event handler

  • To reset component state when a prop changes, pass the prop as the component's key instead of using useEffect

  • useEffect is ONLY for synchronizing with external systems (non-React widgets, browser APIs, network subscriptions)

Identifying users

Identify users during login and signup events. Refer to the example code and documentation for the correct identify pattern for this framework. If both frontend and backend code exist, pass the client-side session and distinct ID using X-POSTHOG-DISTINCT-ID and X-POSTHOG-SESSION-ID headers to maintain correlation.

Error tracking

Add PostHog error tracking to relevant files, particularly around critical user flows and API boundaries.

Files

references/basic-integration-1.1-edit.md

title: PostHog Setup - Edit description: Implement PostHog event tracking in the identified files, following best practices and the example project

For each of the files and events noted in .posthog-events.json, make edits to capture events using PostHog. Make sure to set up any helper files needed. Carefully examine the included example project code: your implementation should match it as closely as possible. Do not spawn subagents.

Use environment variables for PostHog keys. Do not hardcode PostHog keys.

If a file already has existing integration code for other tools or services, don't overwrite or remove that code. Place PostHog code below it.

For each event, add useful properties, and use your access to the PostHog source code to ensure correctness. You also have access to documentation about creating new events with PostHog. Consider this documentation carefully and follow it closely before adding events. Your integration should be based on documented best practices. Carefully consider how the user project's framework version may impact the correct PostHog integration approach.

Remember that you can find the source code for any dependency in the node_modules directory. This may be necessary to properly populate property names. There are also example project code files available via the PostHog MCP; use these for reference.

Where possible, add calls for PostHog's identify() function on the client side upon events like logins and signups. Use the contents of login and signup forms to identify users on submit. If there is server-side code, pass the client-side session and distinct ID to the server-side code to identify the user. On the server side, make sure events have a matching distinct ID where relevant.

It's essential to do this in both client code and server code, so that user behavior from both domains is easy to correlate.

You should also add PostHog exception capture error tracking to these files where relevant.

Remember: Do not alter the fundamental architecture of existing files. Make your additions minimal and targeted.

Remember the documentation and example project resources you were provided at the beginning. Read them now.

Status

Status to report in this phase:

  • Inserting PostHog capture code

  • A status message for each file whose edits you are planning, including a high level summary of changes

  • A status message for each file you have edited

Upon completion, continue with: basic-integration-1.2-revise.md

Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Security

No issues found by our static scan· No issues found

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Attribution and licence

Created by
PostHog
Publisher
PostHog (Official)
Source
PostHog/skills · skills/posthog/integration/skills/react-react-router-7-declarative · commit a5d30e7
Licence
MIT License (redistribution allowed)
  • LICENSE (added by AutoGineer from LICENSE)
  • ATTRIBUTION.md (written by AutoGineer)
Synced
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AutoGineer is not affiliated with or endorsed by PostHog or PostHog.

Download ZIP

The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download integration-react-react-router-7-declarative.zip