Developer Tools

JSON Web Token (JWT) Debugger

Modernized critical security tool used by millions of developers for JWT validation and debugging. Rebuilt from legacy JavaScript to modern stack with Next.js and TypeScript.

Technical Overview

Tech stack

  • Built with Next.js and TypeScript.
  • Uses Zustand for state management.

Beta site

The Beta site is expected to hit General Availability (GA) by Jan 31st, 2025.

https://jwt.io/beta

Please enter the following code to access the beta site:

Beta Access Code
jwtv2

Challenge & Context

  • Decade-old codebase causing developer friction.
  • Poor error handling led to a confusing user experience.
  • Tightly coupled decode/encode operations created several pain points.
  • Growing feature requests from the community.
  • Critical tool requiring zero downtime during the upgrade.

Solution

  • Implemented widget-based architecture separating concerns.
  • Created a comprehensive validation system.
  • Built explicit configuration options for JWT operations.
  • Enhanced error feedback system.
  • Established clear security-focused documentation.

Impact & Results

  • Maintained support for millions of monthly users.
  • Improved developer experience with clear feedback.
  • Enhanced security and understanding through explicit configurations.
  • Reduced cognitive burden through better error handling.
  • Created a foundation for future security tools.