JWT Decoder
Paste a JSON Web Token to inspect its header and payload (claims). Decoding is local; this tool does not verify signatures or send your token anywhere.
- Last reviewed:
- What we verified
- Decode only; no signature verification.
- Source
- IETF RFCs and ECMAScript JSON semantics where applicable.
- Official references
- Disclaimer
- Outputs follow published specs (RFCs, JSON standard, etc.). Always validate security-sensitive tokens and payloads in trusted environments.
Examples
- Inspect exp (expiry) and sub (subject) claims before debugging an API
- Check alg in the header, never accept tokens with alg:none in production
Wrong result? Report an issue · Methodology
How to Use
- Paste a JWT (three base64url segments separated by dots).
- Read the decoded header (algorithm, type) and payload (claims).
- Use a proper library server-side to verify signatures, this tool only decodes.
Frequently Asked Questions
Does this verify the JWT signature?
No. It only base64-decodes the header and payload. Signature verification requires your secret/public key in trusted server code.
Is it safe to paste production tokens here?
Decoding is local, but avoid pasting live secrets on any website if your policy forbids it. Prefer dev/staging tokens.
Guides & worked examples
Start with examples →JWT Decoder Examples
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