JWT
eyJhbGci….eyJzdWIi….xxx
Payload
{ "sub": "1234" }Developer Tools
JWT Header and Payload Decoder
Decode JWTs locally into readable Header and Payload JSON. Tokens never leave the browser.
JWTTokenSecurity
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开发工具
JWT Payload Viewer
仅做本地解码，不验证签名。
Header（算法与类型）
Payload（声明数据）
Signature（签名）
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Use cases
- Check exp on tokens from network captures
- Verify claims after login
- Debug 401 responses by inspecting auth tokens
How to use
- Paste a complete JWT (eyJ...)
- Review Header and Payload JSON
- Check claims and expiration locally
Example input and output
FAQ
Does it verify signatures?
No. It only Base64Url-decodes; signature verification belongs on the server with the secret or public key.
Is the token uploaded?
No. Parsing runs locally and exports omit the full token, payload, and signature.
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