Online JWT (JSON Web Token) Decoder
Paste any JWT to inspect its decoded Header, Payload, and expiration status—100% locally in your browser.
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What is a JWT Decoder?
A JSON Web Token (JWT) is a compact, URL-safe token used for authentication in APIs and web apps. It consists of three Base64Url-encoded parts separated by dots: Header.Payload.Signature. This tool decodes the Header and Payload into readable JSON.
Security & Benefits
- 100% Client-Side: Never paste production auth tokens into untrusted servers—here, decoding happens strictly inside your browser.
- Expiration Checker: Automatically converts
expUnix timestamps into readable dates and tells you if a token is expired.