Connect a React Native app to an HTTPS API in production

A React Native app can call an API with fetch, but the development server does not travel with the binary you install from Google Play or the App Store. Deploy the backend at a public URL and configure the release build to use it.

Use a reachable HTTPS endpoint

A URL such as http://localhost:3000/api points to the device making the request. On a phone, that is the phone, not the computer running Metro. Set a production URL such as https://api.example.com/v1, then verify DNS, TLS and the API route from outside your development network. Keep emulator and local-network addresses in development configuration only.

React Native documents fetch for network requests and platform differences around cleartext traffic. Use HTTPS in production and do not add broad HTTP exceptions to bypass a certificate problem. See the React Native networking guide.

Handle status codes and unexpected responses

Check response.ok before treating a response as a success. Handle network failures separately from HTTP errors and validate the returned data instead of assuming it matches a TypeScript type. A type helps your editor; it does not validate JSON at runtime. Add a timeout or cancellation strategy and bounded retries where appropriate. Test authentication expiry, server errors, malformed responses and offline use in a release build on Android and iOS.

Keep credentials out of the mobile bundle

A value included in a mobile build can be extracted, even if it came from an environment variable. Bundle public configuration such as the API URL, not database passwords, admin tokens or private service credentials. The API must authenticate each request and authorize the requested action; hiding a button in the app does not enforce access. Validate input and keep tokens out of logs. OWASP’s REST Security Cheat Sheet covers server-side controls.

Native React Native requests do not use browser CORS. A separate web client does, and may need an OPTIONS response. Restrict allowed origins to the web apps you actually operate rather than opening every origin as a workaround.

Choose a place for the backend

Projects may fit a Node.js service or supported container deployed from Git; check the plan’s runtime and resources. A VPS gives you control over system packages, Docker Compose and process configuration, while you manage operating-system updates, security and backups. A mobile frontend bundle does not start an API process on its own. See the mobile app backend guide and verify the current product details before choosing.

Before release, search the production configuration for localhost, 127.0.0.1 and private IP addresses. Confirm the public HTTPS endpoint, test expected success and error statuses, and verify that no private credentials are present in the bundle. Compare a custom API with Firebase and see the Flutter production checklist if your app also targets Flutter.

Before ordering, compare where to host an API: Projects or a VPS by deployment and maintenance requirements.