JWT 解码器
解码并查看 JWT Token
🔒 100% client-side — your data never leaves this pageAbout this tool
粘贴任意 JWT Token 即可解码查看 Header、Payload 和 Signature。内置常用 Claims 说明（iss、sub、exp、iat 等），自动显示过期状态。完全在浏览器中运行，数据不发送至任何服务器。
Frequently Asked Questions
What is a JWT?
A JSON Web Token (JWT) is a compact, URL-safe way to represent claims between two parties. It consists of three Base64URL-encoded parts: Header, Payload, and Signature, separated by dots.
Is my JWT token safe to paste here?
Yes. Decoding happens entirely in your browser. Your token is never sent to any server. However, avoid sharing JWTs containing sensitive data in public.
Can you verify the JWT signature?
No. Signature verification requires the secret key or public key used to sign the token, which we do not have. This tool only decodes the Header and Payload.
What does the expiration status mean?
If the token contains an exp claim, we compare it against the current time. Expired tokens are flagged in red. Note that a valid signature is still required for actual authentication.