JWT DECODER

See inside a JWT token.

Decode the header and payload of a JSON Web Token, entirely in your browser.

JWT token

Header

Payload

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This only decodes the token's contents — it does not verify the signature. A decoded token is not proof it's authentic or untampered.

What is a JWT?

A JSON Web Token has three parts separated by dots: a header, a payload, and a signature. The header and payload are just Base64-encoded JSON, readable by anyone — this tool decodes those two parts so you can inspect their contents.