Free JWT Decoder
Free tool to securely decode JSON Web Tokens (JWT) and view their header and payload claims instantly in your browser.
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How to use it
Paste Your JWT
Paste your encoded JWT string (usually starting with 'eyJ') into the main input field.
View Header & Payload
The tool instantly decodes the token and formats the Header and Payload as readable JSON in the respective panels.
Check For Errors
If the token is malformed, an error message will immediately alert you.
FAQ
?Is this JWT decoder safe to use for production tokens?
Yes. All decoding happens strictly on your local machine using client-side JavaScript. Your sensitive tokens are never sent to any server.
?Can it verify the JWT signature?
Currently, this tool only decodes the header and payload. It does not verify the cryptographic signature since that requires the secret key.
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Your data never leaves your browser
A fully client-side, free JWT decoder. Paste your JSON Web Token to instantly parse and format its header and payload claims into readable JSON. Ideal for debugging authentication issues without sending sensitive tokens over the network.