Code & Data · Local-first
JWT Decoder Online
Inspect JWT content without verifying its signature.
Open JWT DecoderFree · No sign-up · Browser-based processing
What JWT Decoder does
Inspect the header and payload of a JSON Web Token by decoding its Base64URL segments. Decoding reveals claims but does not prove that a signature is valid.
Common uses
- Debug OAuth and OpenID Connect flows
- Inspect development access-token claims
- Confirm token timestamps and audiences during API integration
How to use JWT Decoder
- Paste a three-part JWT into the input editor.
- Run the decoder to view its header and payload JSON.
- Review claims such as issuer, subject and issued-at time; verify signatures separately when trust matters.
Privacy: Runs locally in your browser. Input is not uploaded to the DevNet Kit server.
JWT Decoder example
Try the tool with this representative input:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJuYW1lIjoiQWRhIiwiaWF0IjoxNTE2MjM5MDIyfQ.signatureJWT Decoder FAQ
Does decoding verify the JWT signature?
No. This decoder only reads the header and payload. Use the JWT Signer / Verifier tool or a trusted server library for verification.
Is a JWT encrypted?
Usually not. A standard signed JWT exposes its header and payload to anyone holding the token.
Should I paste a production token?
Avoid sharing live credentials. Although decoding is local, use redacted or test tokens whenever possible.