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JWT Decoder

Inspect JWT headers and payload safely in your browser.

Decode header and payload.
No token is sent to a server.
Copy decoded JSON easily.
Useful for debugging auth flows.
Related:Base64URL EncodeJWT Security

Frequently Asked Questions

Does decoding verify signature?
No. Decoding shows the token contents. Use a verifier to validate signatures.
Is it safe to paste tokens?
Treat tokens as secrets. This tool is client-side, but avoid pasting real production tokens.