JWT Toolbox - JWT Encoder & Decoder

A sleek toolbox for creating, decoding, and re-signing JWTs.

JWT Toolbox is a developer utility for working with JSON Web Tokens (JWTs) directly in your browser. Whether you are debugging an API, testing authentication flows, or quickly generating a new token, JWT Toolbox makes the process simple and fast. Key Features: • Generate JWTs — Create signed tokens for testing and development. • Decode JWTs — Instantly view header, payload, and signature in a readable format. • Edit and modify — Adjust claims or payload values before re-encoding. • Custom themes — Switch between light and dark modes. • Quick copy — Copy tokens to your clipboard in one click. • State persistence — Optional saving of your last-used theme and inputs. Why JWT Toolbox? • Runs entirely in your browser — no external services, no data sharing. • Lightweight and distraction-free — focused purely on JWTs. • Ideal for developers, testers, and security engineers who need a reliable JWT helper. Privacy: JWT Toolbox does not collect or transmit any personal data. All operations happen locally in your browser. JWT secret is never saved.