JWT
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjMifQ.sig
Payload
{
"sub": "123"
}Developer Tools
JWT Decoder for Header and Payload
Decode JWT structure into formatted Header and Payload JSON with algorithm and expiry hints. Does not verify signatures; all processing stays local.
JWTDecodeToken
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开发工具
JWT Decoder
纯前端离线解析 Header / Payload（不验证签名算法正确性），便于快速查看结构与过期状态。
等待输入
Encoded JWT (Base64Url)
Header (Algorithm & Type)
Payload (Data & Claims)
Signature (Hex/Base64 Dump)
Use cases
- Read exp and business claims in access tokens
- Check alg and typ in the header
- Debug opaque backend JWT fields
How to use
- Paste the full JWT string
- Review Header, Payload, and Signature sections
- Copy segments
Example input and output
FAQ
Does it verify signatures?
No. It decodes structure only and cannot prove issuer trust.
Does the token leave the browser?
No. Decoding runs locally in your browser.
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