# JWT Decoder

Decode and analyze JSON Web Tokens. View header, payload, signature, and claims — entirely in your browser.

JWT Token

About JWT Tokens

JSON Web Tokens (JWT) are an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. JWTs consist of three parts:

Header: Contains the token type and signing algorithm
Payload: Contains the claims (user data and metadata)
Signature: Used to verify the token hasn't been tampered with

Security Note: Never share JWTs containing sensitive information. This tool decodes tokens client-side and does not send them to any server.