🔑 JWT 解析JWT Decoder

粘贴 JSON Web Token，即时解码出头部与载荷，并显示算法、过期与签发时间等声明。全程在浏览器本地解码，不联网、不验签、绝不上传。Paste a JSON Web Token to decode its header and payload, with algorithm, expiry and issued-at claims. Decoded locally — no network, no upload.

① 输入令牌① Paste token

② 解析结果② Decoded

使用说明How to use

怎么用How to use
  1. 粘贴 JWT（xxx.yyy.zzz）Paste a JWT (xxx.yyy.zzz)
  2. 即时解码出头部与载荷Instantly decode header and payload
  3. 查看算法、过期与签发时间See algorithm, expiry and issued-at

示例：eyJhbGci… → 解码出 sub/nameExample: eyJhbGci… → decoded sub/name

全程在你的浏览器本地完成，文本不会上传服务器。Runs entirely in your browser; your text is never uploaded.

JWT 由「头部.载荷.签名」三段组成，前两段是 Base64URL 编码的 JSON，任何人都可直接解码查看——因此载荷切勿存放敏感信息。常见声明：exp 过期时间、iat 签发时间、nbf 生效时间、sub 主题、iss 签发者、aud 受众。A JWT is header.payload.signature; the first two parts are Base64URL-encoded JSON that anyone can decode — so never put secrets in the payload. Common claims: exp (expiry), iat (issued at), nbf (not before), sub, iss, aud.