JWT Decoder
Decode and inspect JWT header, payload, and time claims with expiry status. Free, private, and 100% client-side.
Local decoding is not server-side signature verification.Local only
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How to use
- Paste the JWT into the input box.
- Read the decoded header and payload.
- Check the time-claim status and expiry note.
Frequently asked questions
- Does decoding a JWT verify its signature?
- No. Decoding only reads the payload. Signature verification requires the secret or public key and is not the same as trusting the token.
- How is expiry shown?
- The tool parses the exp, iat, and nbf claims and labels the token as EXPIRED, NOT YET VALID, or VALID.