JWT Decoder
Decode any JWT token to view its header and payload. Perfect for debugging authentication flows and inspecting token claims. Works entirely in your browser.
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💡 Tip: JWT tokens consist of three parts: Header (algorithm info), Payload (claims/data), and Signature (verification). This tool decodes the header and payload but cannot verify signatures without the secret key.
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Frequently Asked Questions
How do I decode a JWT?
Simply paste your JWT token in the input field. The tool will automatically decode and display the header, payload, and signature.
What information can I see in a decoded JWT?
You can see the algorithm (alg), token type (typ) in the header, and all claims like subject (sub), issuer (iss), expiration (exp), and custom claims in the payload.
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