Jwt-Decoding

Decoding JWT tokens can be a crucial part of debugging and understanding the authentication and authorization processes in your applications. Whether you’re working on a microservices architecture or a single-page application, being able to quickly inspect JWT tokens can save you a lot of time. In this post, I’ll walk you through how to decode JWT tokens from the command line using tools like base64 and jq. The Problem JWT tokens are compact, URL-safe means of representing claims to be transferred between two parties. They are commonly used for authentication and information exchange. However, JWT tokens are often encoded, making them unreadable. Decoding them manually can be cumbersome, especially if you need to do it frequently during development or debugging. ...

JSON Web Tokens (JWT) have become a cornerstone of modern web authentication. Whether you’re building a REST API, a single-page application, or a microservices architecture, understanding how to decode and validate JWTs is essential. In this article, we’ll compare the top tools available for decoding JWTs, focusing on the trade-offs between online services and local libraries. Visual Overview: graph LR subgraph JWT Token A[Header] --> B[Payload] --> C[Signature] end A --> D["{ alg: RS256, typ: JWT }"] B --> E["{ sub, iss, exp, iat, ... }"] C --> F["HMACSHA256(base64(header) + base64(payload), secret)"] style A fill:#667eea,color:#fff style B fill:#764ba2,color:#fff style C fill:#f093fb,color:#fff Understanding JWT Decoding Before diving into the tools, let’s briefly recap what JWT decoding entails. A JWT consists of three parts: a header, a payload, and a signature, all base64url encoded. Decoding a JWT involves: ...