🕵️JWT Decoder (Client-Side)
Disclaimer: This tool only decodes the token. It does not verify the signature against the secret key.
JSON Web Tokens (JWTs) are commonly used for authentication and information exchange in web applications. Our JWT Decoder is a simple utility for developers that allows you to quickly inspect the contents of a token. Paste a JWT, and the tool will decode the Base64Url-encoded header and payload, displaying them as readable JSON objects.
This is incredibly useful for debugging API authentication issues or verifying the claims (like user ID, roles, and expiration time) contained within a token. Please note that this tool only decodes the token; it does not validate its signature, as that requires the secret key which should always be kept private on the server.
This is incredibly useful for debugging API authentication issues or verifying the claims (like user ID, roles, and expiration time) contained within a token. Please note that this tool only decodes the token; it does not validate its signature, as that requires the secret key which should always be kept private on the server.
Frequently Asked Questions
Is it safe to paste my JWT here?
Yes. This tool operates entirely within your browser (client-side). Your JWT is never transmitted over the network, so it remains secure. However, you should always be cautious about where you paste sensitive tokens.
What does 'signature not verified' mean?
A JWT has three parts: header, payload, and signature. The signature is used to verify that the token was not tampered with. This requires a secret key that only the server has. Our tool can't perform this verification, it only shows you the publicly visible information in the header and payload.
