JWT Decoder
Decode and inspect JSON Web Tokens — header, payload, and expiry status.
Note: This tool only decodes JWTs client-side. It does NOT verify the signature.
Frequently Asked Questions
Is it safe to paste my JWT here?
Decoding runs entirely in your browser with no server upload. However, avoid pasting production tokens from shared or public devices.
Can this tool verify JWT signatures?
This tool decodes (reads) JWTs without verifying the signature. Verification requires the secret key and should be done on your backend.
What is a JWT used for?
JWTs are used for authentication and API authorization. They contain user claims (roles, ID, expiry) in a compact, URL-safe format.