JWT Decoder

Decode and inspect JSON Web Tokens securely in your browser.

JWT Token
HeaderALGORITHM & TOKEN TYPE
Waiting for input...
PayloadDATA
Waiting for input...

What is a JWT?

JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed.

JWT Structure

A JWT consists of three parts separated by dots (.):

  • Header: Typically consists of the type of token (JWT) and the signing algorithm (HMAC SHA256 or RSA).
  • Payload: Contains the claims (user data, expiration, etc.). This is what we decode above.
  • Signature: Used to verify the message wasn't changed along the way.

Security Note

This tool decodes the token entirely in your browser. Your tokens are never sent to our servers. However, always be cautious when pasting sensitive tokens (like production API keys) into any online tool.