Best of JWT — July 2025

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   Article

   InfoSec Write-ups·38w

   One Tool to Rule JWTs — Easy JWT Pentesting with JWTAuditor

   JWTAuditor is an open-source, privacy-focused JWT security testing tool that performs all analysis locally in the browser without sending tokens to external servers. It automatically detects over 15 types of JWT vulnerabilities, includes built-in brute force testing with 10,000+ common secrets, and features a visual token editor with syntax highlighting. The tool addresses privacy concerns with online JWT analyzers by keeping all data client-side while providing comprehensive security analysis including algorithm validation, sensitive data detection, and security claim verification.

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2. 2
   Article

   Microservices.io·39w

   Authentication and authorization in a microservice architecture: Part 3 - implementing authorization using JWT-based access tokens

   Explores implementing authorization in microservices using JWT-based access tokens, covering four strategies for obtaining distributed authorization data: provide (embedding data in tokens), fetch (dynamic retrieval), replicate (local copies), and delegate (authorization service). Discusses JWT limitations including coupling risks, token staleness, size constraints, and security concerns. Uses RealGuardIO application examples to demonstrate when access token authorization works well for simple RBAC scenarios versus complex authorization requiring remote data from multiple services.

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   Video

   Dreams of Code·38w

   Better Auth is so good that I **almost** switched programming languages

   Better Auth is a TypeScript authentication library that offers comprehensive features like two-factor authentication, organizations, and payment integrations through plugins. While the author prefers Go for backend development, Better Auth's capabilities are compelling enough to consider switching languages. The tutorial demonstrates how to integrate Better Auth with a Go backend using JWT tokens, covering token generation, verification with JWK endpoints, and different approaches for authenticated requests including client-side caching and server-to-server proxying through Next.js.

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   Article

   freeCodeCamp·41w

   What Are JSON Web Tokens (JWT)?

   JSON Web Tokens (JWT) are digitally signed, self-contained tokens used for secure authentication between systems. JWTs consist of three parts: header (metadata), payload (claims/data), and signature (verification). They can be signed using symmetric algorithms like HS256 with shared secrets or asymmetric algorithms like RS256 with public/private key pairs. The signature ensures authenticity and integrity without requiring server-side session storage. Key security practices include using HTTPS, keeping tokens short-lived, implementing refresh tokens, protecting signing keys, and never storing sensitive data in the payload.

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