Next.js Integration

The @emulators/adapter-next package embeds emulators directly into a Next.js App Router app, running them on the same origin. This is particularly useful for Vercel preview deployments where OAuth callback URLs change with every deployment.

Install

npm install @emulators/adapter-next @emulators/github @emulators/google

Only install the emulators you need. Each @emulators/* package is published independently, keeping serverless bundles small.

Route Handler

Create a catch-all route that serves emulator traffic: