JWT Decoder
Debug Authentication — Paste your JSON Web Token (JWT) to instantly decode its payload and header. 100% Client-side.
Encoded JWT
Token Guide
What is a JWT?
JSON Web Tokens (JWT) are an open, industry-standard RFC 7519 method for representing claims securely between two parties.
Client-side Security
Our decoder runs entirely in your browser. We never send your tokens to a server, ensuring your sensitive data remains completely private.
Easy Debugging
Instantly inspect standard claims like expiration (exp), issuer (iss), or custom user roles encoded in the payload.