关于本计算器
Decode any JSON Web Token into header and payload JSON with expiry verdict.
JWT解码器
令牌头与载荷。
输入计算参数
计算结果摘要
签名部分（未验证）SflKxwRJSMeKKF2QT4fw…—
头部
{
"alg": "HS256",
"typ": "JWT"
}载荷
{
"sub": "1234567890",
"name": "John Doe",
"iat": 1516239022
}常见问题
Three parts?
Header, payload and signature, dot-separated and base64url-encoded.
Signature verified?
No — decoding only; verification needs the secret or public key.
exp claim?
Unix timestamp compared against now for the expired/valid badge.