JWT Decoder

Inspect the header and payload of a JSON Web Token without sending it anywhere.

JSON Web Token

Signatures are not verified — this decodes the header and payload only. Never paste a token you still rely on into any online tool, including this one.

How this works

JWT Decoder runs as plain JavaScript inside this page using the browser's own Web Crypto and text APIs. There is no request to our server when you press the button, so nothing you enter leaves your device.

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