Bun

The Bun JavaScript runtime can run a web standard HTTP server with Cloud Auth like this:

import { createVerifier } from '@featherscloud/auth'

const appId = '<your-app-id>'
const verifier = createVerifier({ appId })

const headers = {
  'Content-Type': 'application/json',
  'Access-Control-Allow-Headers': '*',
  'Access-Control-Allow-Methods': 'GET',
  'Access-Control-Allow-Origin': '*',
}

const server = Bun.serve({
  port: 3030,
  async fetch(request) {
    // Handle CORS preflight request
    if (request.method === 'OPTIONS') {
      return new Response(null, {
        status: 200,
        headers,
      })
    }

    try {
      const header = request.headers.get('Authorization')

      if (!header) {
        throw new Error('Invalid Authorization header')
      }

      // Verify the Authorization header and get the user information
      const { user } = await verifier.verifyHeader(header)

      if (!user) {
        throw new Error('Cloud auth user not found')
      }

      const body = {
        message: `Hello ${user.email} from BunJS!`,
      }

      return Response.json(body, {
        status: 200,
        headers,
      })
    }
    catch (error) {
      return Response.json({ error: (error as any).message }, {
        status: 400,
        headers,
      })
    }
  },
})

console.log(`BunJS application ${appId} listening on http://localhost:${server.port}`)

The full Bun example server can be found here.