JWT Decoder

Decode and inspect JSON Web Tokens. See header, payload, and expiration status instantly.

Header

Payload

What is a JWT?

A JSON Web Token (JWT) is a compact, URL-safe token format used for securely transmitting information between parties. JWTs consist of three parts: a header (algorithm and token type), a payload (claims like user ID, expiration), and a signature.

This tool decodes the header and payload — it does not verify the signature. Never paste production tokens containing sensitive data into online tools that send data to a server. This tool runs entirely in your browser.