ZenovayTools

JWT Decoder

Decode and inspect JWT tokens. View header, payload, and verify signatures.

How to Use JWT Decoder

  1. 1Paste your JWT token into the input field.
  2. 2The header and payload are decoded and displayed automatically.
  3. 3Review the decoded claims including expiration, issuer, and subject.
  4. 4Copy individual decoded sections or the full result.
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Frequently Asked Questions

Is my JWT safe?▾
Yes, decoding happens entirely in your browser. No data is ever sent to any server.
Can I verify signatures?▾
This tool decodes the token for inspection. Signature verification requires the secret key, which should never be pasted into a web tool.
What JWT formats are supported?▾
This tool supports standard JWTs (JSON Web Tokens) with three Base64url-encoded segments separated by dots.
How does this compare to jwt.io?▾
Like jwt.io, this tool decodes the header and payload of a JWT. The key difference is that this tool runs entirely in your browser with no external requests, so your tokens are never exposed to any third-party server.
Can I use this tool on my phone?▾
Yes, the JWT decoder works in any modern mobile browser. You can paste a token and view the decoded header, payload, and expiration status on any device.
When should I use a JWT decoder?▾
Use it to inspect the claims inside a JWT during development, debug authentication issues, check token expiration times, or verify the algorithm specified in the header before deploying your auth flow.
Does the decoder show when my token expires?▾
Yes. If the token payload contains an "exp" claim, the tool automatically calculates the expiration date and displays whether the token is still valid or has expired.