JWT Decoder
Decode and inspect JSON Web Tokens (JWT) instantly in your browser without sending them to a server.
Decode JWT tokens instantly to inspect header and payload claims. A privacy-first tool that processes everything client-side without any server requests.
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) instantly in your browser without sending them to a server.
About this tool
Decode JWT tokens instantly to inspect header and payload claims. A privacy-first tool that processes everything client-side without any server requests.
Paste a JSON Web Token (JWT) to decode its header and payload.
Paste your JWT here
Output appears here...
Paste your JWT here
Paste a JSON Web Token (JWT) to decode its header and payload.
Paste your JWT here
FAQ
Common questions and answers about this topic.
What is a JWT?
A JWT (JSON Web Token) is a compact, URL-safe token format used for securely transmitting information between parties as a JSON object.
What parts of a JWT are decoded?
The header, payload, and signature are separated and displayed as formatted JSON, along with expiration status and algorithm information.
Can this verify JWT signatures?
This tool decodes and displays the token contents. Signature verification requires the secret key and is not performed client-side for security reasons.
Is my data sent to any server?
No, JWT decoding happens entirely in your browser. Your token is decoded locally with JavaScript — the token content is never sent to any server.