JWT Decoder
Decode JWT tokens to view header, payload, and signature. Check expiration status. 100% client-side.
Processed in your browser
100% Client-Side — Your token never leaves your browser
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What is JWT Decoder?
A JWT (JSON Web Token) decoder parses and displays the three parts of a JWT token: the header (algorithm and type), the payload (claims and data), and the signature. JWTs are widely used for authentication and authorization in web applications.
How to Use
- Paste your JWT token (starting with eyJ...) into the input field
- View the decoded header, payload, and signature sections
- Check the expiration status — the tool automatically detects if the token has expired
- Copy individual sections for debugging or documentation
Frequently Asked Questions
- Is it safe to paste my JWT token here?
- Yes, this tool runs 100% in your browser. Your token is never sent to any server. You can verify this by checking the network tab in your browser's developer tools.
- What is the 'exp' claim in a JWT?
- The 'exp' (expiration time) claim is a Unix timestamp indicating when the token expires. After this time, the token should no longer be accepted for processing.
- Can this tool verify the JWT signature?
- This tool decodes and displays the token but does not verify the signature, as that requires the secret key or public key used to sign it.