Free Online JWT Decoder & Token Inspector
Paste any JWT token to instantly decode and inspect its three parts: header (algorithm and type), payload (claims like issuer, subject, expiration), and signature. The decoder highlights important claims, checks if the token is expired, and displays timestamps in a human-readable format. Essential for debugging authentication flows, OAuth integrations, and API authorization. No data is sent to any server.
Common questions
Does this tool verify the JWT signature?
This tool decodes the JWT header and payload (which are Base64-encoded, not encrypted) for inspection. Signature verification requires the signing secret or public key, which this client-side tool doesn't have access to. Use it for inspecting token contents, not for security validation.
Is it safe to paste my JWT token here?
Yes. All decoding happens entirely in your browser using JavaScript. The token is never sent to any server. However, never share JWT tokens publicly as they may contain sensitive claims.