https://ai-blog.noorshomelab.dev/tags/passlib/Recent content in Passlib on AI VOIDHugoenWed, 20 Aug 2025 00:00:00 +0000https://ai-blog.noorshomelab.dev/chat-guide/chapter-4-basic-auth/Wed, 20 Aug 2025 00:00:00 +0000https://ai-blog.noorshomelab.dev/chat-guide/chapter-4-basic-auth/<p>Before users can chat, we need to know who they are. This chapter focuses on implementing a basic user authentication system using JSON Web Tokens (JWT) in FastAPI. JWTs are a common, secure way to transmit information between parties as a JSON object, ideal for stateless authentication in APIs.</p> <h3 id="purpose-of-this-chapter">Purpose of this Chapter</h3> <p>By the end of this chapter, you will:</p> <ul> <li>Understand what JWTs are and why they are used for authentication.</li> <li>Set up libraries for password hashing and JWT generation.</li> <li>Implement user creation and login endpoints.</li> <li>Create a dependency to protect FastAPI routes with JWT.</li> </ul> <h3 id="concepts-explained-jwt-and-hashing">Concepts Explained: JWT and Hashing</h3> <h4 id="json-web-tokens-jwt">JSON Web Tokens (JWT)</h4> <p>A JWT is a compact, URL-safe means of representing claims to be transferred between two parties. The claims in a JWT are encoded as a JSON object and are digitally signed using a secret (with HMAC algorithm) or a public/private key pair (with RSA or ECDSA).</p>