React Router Web Analytics installation

Install the package

Required

Install the PostHog JavaScript library and React SDK using your package manager:

npm install --save posthog-js @posthog/react
yarn add posthog-js @posthog/react
pnpm add posthog-js @posthog/react

Configure Vite

Required

Add posthog-js and @posthog/react to ssr.noExternal in your vite.config.ts to avoid SSR errors:

vite.config.ts
// ... imports

export default defineConfig({
  plugins: [tailwindcss(), reactRouter(), tsconfigPaths()],
  ssr: {
    noExternal: ['posthog-js', '@posthog/react'],
  },
});

Add the PostHogProvider

Required

Initialize PostHog and wrap your app with the PostHogProvider in your app/entry.client.tsx file:

app/entry.client.tsx
import { startTransition, StrictMode } from "react";
import { hydrateRoot } from "react-dom/client";
import { HydratedRouter } from "react-router/dom";
import posthog from "posthog-js";
import { PostHogProvider } from "@posthog/react";

posthog.init("<ph_project_token>", {
  api_host: "https://us.i.posthog.com",
  defaults: "2026-01-30",
});

startTransition(() => {
  hydrateRoot(
    document,
    <PostHogProvider client={posthog}>
      <StrictMode>
        <HydratedRouter />
      </StrictMode>
    </PostHogProvider>,
  );
});

Send events

Click around and view a couple pages to generate some events. PostHog automatically captures pageviews, clicks, and other interactions for you.

If you'd like, you can also manually capture custom events:

JavaScript
posthog.capture('my_custom_event', { property: 'value' })

5
Next steps
Recommended
After installing PostHog and ensuring autocapture is enabled, head to your web analytics dashboard to see your data. And then check out our getting started guide.
PostHog tip: Web analytics works with anonymous events. This means if you are primarily using PostHog for web analytics, it can be significantly cheaper for you.

React Router Web Analytics installation

Install the package

Configure Vite

Add the PostHogProvider

Send events

Next steps

Community questions

Was this page useful?