Decode JWT header
Inspect algorithm and token metadata from the header segment.
Free. Private. No uploads.
JWT Decoder
Decode JSON Web Token header and payload segments inside your browser. Pocket Dev helps you inspect token structure locally without uploading sensitive strings.
What it does
Inspect JWT structure without uploading tokens.
JWT Decoder helps developers read token header and payload JSON while debugging authentication, claims and API behavior. It does not verify trust or send the token to a backend.
Read payload claims
Decode claims such as issuer, subject, audience and expiry when present.
Local token decoding
The token string stays in your browser while it is decoded.
How to use
Use JWT Decoder in a few steps.
- Open the JWT Decoder tool inside Pocket Dev.
- Paste a JWT string.
- Review the decoded header and payload.
- Copy the decoded JSON if needed.
FAQ
JWT Decoder questions
Is this JWT decoder free?
Yes. Pocket Tools is free to use.
Does it verify JWT signatures?
No. This tool decodes header and payload for inspection; it does not prove the token is trusted.
Are tokens uploaded?
No. The JWT is decoded locally in your browser.