JWT Decoder
Decode and inspect JSON Web Tokens (JWT) — header, payload, and signature.
Header
Payload
Signature
Learn more
How to Use
Paste a JSON Web Token into the input box and click Decode. The tool splits the token into three parts — Header, Payload, and Signature — and displays the decoded JSON. Expiration times are automatically converted to readable dates.
What is a JWT?
JSON Web Token (JWT) is a compact, URL-safe token format used for authentication and information exchange. It consists of three Base64URL-encoded parts separated by dots: header.payload.signature. The header specifies the signing algorithm, the payload contains claims (user data, expiration, etc.), and the signature is used to verify integrity.
Security Note
This tool only decodes tokens — it does not verify signatures. Never share JWTs containing sensitive data. All decoding happens locally in your browser.