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JWT Decoder

Decode and inspect JSON Web Tokens — header, payload, signature and expiry

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ℹ️ About this tool

This JWT Decoder decodes JSON Web Tokens entirely in your browser — no data is ever sent to any server. It splits the token into its three parts (header, payload, signature), base64url-decodes the header and payload, and displays them as formatted JSON. If the payload contains an exp claim the tool shows the expiry date and whether the token is still valid. The iat (issued at) timestamp is shown if present. Note: this tool only decodes — it does not verify the signature.