JWT 验签
校验 JWT 签名并解析关键声明
🔒 100% client-side — your data never leaves this pageJWT Token
Secret (HS256)
Verification
Verification result will appear here
🔒 100% client-side
About this tool
输入 JWT 和密钥后可即时校验签名是否有效，并查看 exp、iat 等关键声明的可读时间。适合认证流程联调、排查 401/403 问题、验证 token 生命周期。工具在浏览器本地完成计算，不上传 token 与密钥。
Frequently Asked Questions
Which JWT algorithms are supported?
This version supports HS256 verification and none tokens for debugging scenarios.
Can it show token expiration time?
Yes. It converts exp and iat claims into readable timestamps for quick inspection.
Does verification require sending secret to server?
No. Signature verification happens entirely in your browser.