Free Online JWT Decoder
Free online tool to securely decode JSON Web Tokens (JWT) and view their header and payload claims instantly in your browser.
Initializing Module
Optimizing assets and preparing high-fidelity workspace...
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 online JWT decoder safe to use for production tokens?
Yes. All online 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 online tool only decodes the header and payload. It does not verify the cryptographic signature since that requires the secret key.
Need a custom tool?
We're constantly adding new tools. Suggest one or report a bug.
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Your data never leaves your browser
A fully client-side, free online 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.