# Integration Sveltekit

> Adds PostHog analytics, identify-user calls, and error tracking to SvelteKit applications by editing

Adds PostHog analytics, identify-user calls, and error tracking to SvelteKit applications by editing svelte.config.js, Svelte components and route files, and environment variable configuration, following a four-step guided workflow with reference docs and an example project. Use when adding PostHog product analytics, session replay, or error tracking to a SvelteKit app, or when wiring user identification on login and signup or passing X-POSTHOG-DISTINCT-ID and X-POSTHOG-SESSION-ID headers between frontend and backend.

- Page: https://ss33.ai/skills/posthog/integration-sveltekit-84205404767
- Publisher: posthog
- Category: [Software Development](https://ss33.ai/skills/category/software-development-t44z8z) › [Languages & frameworks](https://ss33.ai/skills/category/software-development-t44z8z/languages-and-frameworks-rgvrso)
- License: MIT
- Source: https://github.com/posthog/skills/blob/4922922c4ca74db4e6705cecbced2a46fd103f27/skills/posthog/all/skills/integration-sveltekit/SKILL.md

## Skill

SKILL.md: https://ss33.ai/api/v1/ss33/download/posthog/integration-sveltekit-84205404767

# PostHog integration for SvelteKit

This skill helps you add PostHog analytics to SvelteKit 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` - SvelteKit example project code
- `references/svelte.md` - Svelte - 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

- Set paths.relative to false in svelte.config.js — this is required for PostHog session replay to work correctly with SSR and is easy to miss
- Use the Svelte MCP server tools to check Svelte documentation (list-sections, get-documentation) and validate components (svelte-autofixer) — always run svelte-autofixer on new or modified .svelte files before finishing

## 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.