JWT Decoder

Decode JSON Web Tokens (JWT) online for free. Inspect headers and claims securely in your browser.

Inspect the contents of a JSON Web Token (JWT). Paste your token to instantly decode and view the header and payload claims. Processing is strictly client-side to ensure your token remains private.

How to Use JWT Decoder

  1. Paste your JSON Web Token (JWT) into the input field.
  2. The tool instantly splits the token and decodes the Base64Url strings.
  3. View the parsed Header and Payload JSON objects in the editors below.

What Is JWT?

A 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.

Frequently Asked Questions

Is my JWT sent to a server?

No. The token is parsed and decoded purely client-side in your browser. This guarantees your sensitive claims and signatures are not leaked.

Does this tool verify the signature?

Currently, this tool only decodes the header and payload claims so you can inspect their contents. It does not perform cryptographic signature verification against a secret key.

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