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Step‑by‑step guide to adding Facebook Login (OAuth 2.0) to a web app: register the app, handle the redirect, exchange the code for a token, and fetch the user profile via the Graph API.
Learn how to implement a minimal, secure Facebook Login flow using OAuth 2.0, keeping the app secret server‑side, exchanging codes for long‑lived tokens, and storing them in an HttpOnly cookie.
Learn how to set up Facebook Login for your website, from initializing the JavaScript SDK to handling OAuth tokens and avoiding common pitfalls.
When Facebook Login fails with a redirect URI mismatch, the error code 102 or 400 appears. This guide walks through identifying the exact cause, running targeted checks, applying fixes, and knowing when to contact support.
I need to determine the order in which Facebook Login validates OAuth redirect URIs and TLS server certificates during the authorization-code flow. The App Dashboard requires exact redirect-URI matches, while certificate validation is delegated to the operating-system or SDK trust store. Facebook documentation does not state whether an unregistered redirect
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