Remix session replay installation

Install the package

Required

Remix version

This guide is for Remix v2. For Remix v3, see our React Router v7 docs.

Install the PostHog JavaScript library using your package manager:

npm install posthog-js
yarn add posthog-js
pnpm add posthog-js

Configure Vite

Required

Add posthog-js and posthog-js/react to ssr.noExternal in your vite.config.ts so they get bundled for SSR:

vite.config.ts
// ... imports and rest of config

export default defineConfig({
  plugins: [
    remix({
      future: {
        v3_fetcherPersist: true,
        v3_relativeSplatPath: true,
        v3_throwAbortReason: true,
        v3_singleFetch: true,
        v3_lazyRouteDiscovery: true,
      },
    }),
    tsconfigPaths(),
  ],
  ssr: {
    noExternal: ["posthog-js", "posthog-js/react"],
  },
});

Create a provider

Required

Create a provider.tsx file in the app folder. Set up the PostHog provider to initialize after hydration:

app/provider.tsx
import { useEffect, useState } from "react";
import posthog from "posthog-js";
import { PostHogProvider } from "posthog-js/react";

export function PHProvider({ children }: { children: React.ReactNode }) {
  const [hydrated, setHydrated] = useState(false);

  useEffect(() => {
    posthog.init("<ph_project_api_key>", {
      api_host: "https://us.i.posthog.com",
      defaults: "2025-11-30"
    });

    setHydrated(true);
  }, []);

  if (!hydrated) return <>{children}</>;
  return <PostHogProvider client={posthog}>{children}</PostHogProvider>;
}

Wrap your app

Required

Import the PHProvider component in your app/root.tsx file and use it to wrap your app:

app/root.tsx
// ... imports
import { PHProvider } from "./provider";

// ... links, meta, etc.

export function Layout({ children }: { children: React.ReactNode }) {
  return (
    <html lang="en">
      <head>
        <meta charSet="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1" />
        <Meta />
        <Links />
      </head>
      <body>
        <PHProvider>
          {children}
          <ScrollRestoration />
          <Scripts />
        </PHProvider>
      </body>
    </html>
  );
}

export default function App() {
  return <Outlet />;
}

5
Watch session recordings
Recommended
Visit your site or app and interact with it for at least 10 seconds to generate a recording. Navigate between pages, click buttons, and fill out forms to capture meaningful interactions.
Watch your first recording →

Next steps

Recommended

Now that you're recording sessions, continue with the resources below to learn what else Session Replay enables within the PostHog platform.

Resource	Description
Watching recordings	How to find and watch session recordings
Privacy controls	How to mask sensitive data in recordings
Network recording	How to capture network requests in recordings
Console log recording	How to capture console logs in recordings
More tutorials	Other real-world examples and use cases

Remix session replay installation

Install the package

Configure Vite

Create a provider

Wrap your app

Watch session recordings

Next steps

Community questions

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