JWT Decoder
Decode and visualize the content of JWT (JSON Web Token) tokens. Essential tool for developers working with authentication and APIs.
Encoded
Paste a token hereDecoded
Edit the payload and secretbase64UrlEncode(header) + "." +
base64UrlEncode(payload),
your-256-bit-secret
)
How to use the JWT Decoder
- Paste a valid JWT token into the text area.
- Click 'Decode' to see the header, payload, and signature.
- Analyze the information without exposing your secret key.
- Use 'Clear' to reset the tool.
Features
- Instant and secure decoding
- Header and payload visualization in formatted JSON
- Automatic detection of invalid tokens
- 100% client-side: your tokens are never sent to the server
Frequently Asked Questions
What is JWT?
JSON Web Token is an open standard (RFC 7519) for transmitting information between parties as a JSON object. It is commonly used for authentication and information exchange.
Is it safe to decode my token here?
Yes. Decoding happens 100% in your browser. Your tokens are never sent to any server. However, remember that decoding does not validate the signature.
Why can't I validate the signature?
Signature validation requires the secret key used to sign the token, which must remain private on the server. This tool only decodes the token so you can inspect its content.
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