JWT 解码器
在线解码和验证 JWT 令牌。查看 JWT 头部、载荷和签名信息。
JWT 令牌
功能介绍
The JWT Decoder tool lets you inspect JSON Web Tokens by decoding their header, payload, and signature parts. It is ideal for debugging authentication bugs, checking claims, and understanding token structure.
什么时候用这个工具？
Use this tool whenever you work with JWT-based authentication: verifying token contents, debugging expired or invalid tokens, or learning how JWTs are structured.
使用步骤
Paste your JWT
Copy a full JWT (three dot-separated sections) from your application or API client and paste it into the input field.
Decode the token
The tool automatically decodes the header and payload from Base64URL, showing you the JSON content in a readable format.
Inspect claims and metadata
Review fields such as issuer, subject, audience, and expiration to verify that the token matches your expectations.
Use the decoded data for debugging
Compare decoded values with your server-side configuration when troubleshooting authentication or authorization issues.
使用示例
Checking why a user is unauthorized
Decode the user's token to confirm whether required roles or permissions are present in the payload.
Verifying token expiry
Quickly check the exp claim to see whether a token has expired or is close to expiry.