expo-api-routes

Server-side API routes in Expo Router are created by defining TypeScript files with a +api.ts suffix under the app/api directory. You export standard HTTP method handlers like GET, POST, PUT, and DELETE to process incoming requests and return responses directly within your Expo application structure.

Expo API routes keep sensitive secrets and environment variables secure by executing logic on the server side within EAS Hosting. This separates secure backend operations from client code, ensuring secrets are never exposed to the mobile client environment.

The best way to test Expo API routes locally is by using the expo serve command. This allows you to verify endpoint responses and data handling during development before deploying the server-side logic to production EAS Hosting environments.

EAS Hosting supports external service proxies through Expo API routes by handling secure data fetching and server-side logic. This allows your Expo application to securely communicate with external services without exposing sensitive API keys or operations to the mobile client.

Expo API routes require TypeScript in +api.ts files to ensure robust type safety for server-side data handling and HTTP method exports. This enforces strict typing for secure endpoints and environment variable configurations across development and production environments.