JWT Decoder

Paste a JWT to instantly decode and inspect its header, payload, and signature. Debug authentication tokens without server-side processing.

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What is this tool?

A JWT (JSON Web Token) is a compact token format used for authentication and claims. This free JWT decoder lets you paste a token and view the header, payload, and signature—without sending data to any server.

How to use

Paste your JWT in the input field. The tool decodes the header and payload and shows them as readable JSON. Use it to debug tokens or verify claims during development.