Auth Your React Mini App with Telegram: InitData + JWT Validation
Introduction Integrating a Telegram Mini App into a modern web application requires more than just embedding the app in a web page. For secure applications, you must verify that the request genuinely originates from the official mini app and that the user identity is authenticated. This guide walks through building an authentication flow where a React front-end reads the initData sent by…
The article outlines a secure authentication flow for integrating a Telegram Mini App into a React web application, leveraging the initData parameter sent by Telegram. The process involves verifying the integrity and origin of the initData, which contains a cryptographic signature and optionally a JWT, on the backend. The backend, written in PHP, decodes the initData, verifies the HMAC-SHA256 signature using the app's secret key, and optionally decodes the JWT to extract claims such as the user ID, expiration, and permissions.
By performing both signature and JWT validation, the system creates a robust defense-in-depth mechanism that prevents impersonation attacks and ensures only legitimate users can perform protected operations. This approach is compatible with various PHP web frameworks, assuming familiarity with React development and basic PHP programming.
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