JWT Decoder
JWT Decoder Overview
Decode and inspect JWT tokens instantly
Our JWT Decoder is a secure, client-side tool designed to parse and JSON Web Tokens (JWT) instantly. It allows developers to inspect the Header, Payload, and Signature of a token to debug authentication issues, verify claims, and check expiration dates (exp). Unlike other tools, we do not send your tokens to any server—all decoding happens locally in your browser for maximum security.
How to Use JWT Decoder
- Paste your JWT string (usually starting with eyJ...) into the input box.
- The tool automatically splits and decodes the Header and Payload.
- Review standard claims like "sub" (subject), "iat" (issued at), and "exp" (expiration).
- Use the copy buttons to extract specific parts of the token JSON.
Frequently Asked Questions
- What is a JWT?
- JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object.
- Is it safe to paste my token here?
- Yes. This tool runs 100% in your browser. Your sensitive tokens are never sent to our servers or any third party.
- Does this verify the signature?
- No. This tool decodes the token so you can read the data. Verifying the signature requires your private secret key, which you should never share in a browser tool.
- What happens if my token is expired?
- The decoder will still show the content, but it will highlight the expiration date in red to warn you.
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