JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload, and expiration status.
Paste a JWT token above to decode it instantly.
Everything runs in your browser — no data is sent to any server.
About JWT Decoder
Paste any JWT token to instantly decode and inspect its header, payload, and signature. See human-readable claim explanations, expiration status, and validation warnings. Color-coded token parts make it easy to understand the structure. Like jwt.io but faster and cleaner. All decoding happens client-side.
Frequently Asked Questions
What is a JWT?▾
A JSON Web Token (JWT) is a compact, URL-safe token format used for authentication and information exchange. It contains three parts: a header (algorithm info), payload (claims/data), and signature (verification).
Is it safe to paste my JWT here?▾
Yes. Decoding happens entirely in your browser — the token is never sent to any server. However, note that JWTs are only encoded (Base64), not encrypted — anyone with the token can read its contents.
Can this tool verify JWT signatures?▾
This tool decodes and displays JWT contents but does not verify signatures, as that requires the secret key or public key used to sign the token. It will flag expired tokens and show all claims.