Free Online JWT Decoder

Decode JWT header and payload for inspection without verifying the signature.

0 characters
0 characters
Input Characters
0
Output Characters
0

About This Tool

The JWT Decoder extracts and formats the header and payload from a JSON Web Token. It is designed for quick inspection while debugging authentication, API requests, test tokens, and local development flows.

Benefits and Use Cases

  • Inspect JWT header and payload JSON
  • Debug authentication claims during development
  • Review token expiry, subject, issuer, or custom claims
  • Decode tokens locally in the browser

How to Use

  1. Paste a JWT into the input box.
  2. Click Decode JWT.
  3. Review the decoded header, payload, and signature text.

Frequently Asked Questions

Does this verify the signature?

No. It only decodes the token for inspection. It does not verify trust or authenticity.

Should I paste production secrets here?

Avoid pasting sensitive production tokens into any web tool. This tool runs locally, but sensitive tokens should still be handled carefully.

What JWT format is expected?

It expects three dot-separated parts: header, payload, and signature.