JWT (JSON Web Token) is a compact, URL-safe token format used for authentication and information exchange. It contains a header, payload, and signature.

Is it safe to decode JWTs here?

Yes. Decoding happens entirely in your browser. No tokens are sent to any server. Note: decoding only reads the token — it does not verify the signature.

Can this tool verify JWT signatures?

This tool decodes and displays the token contents. Signature verification requires the secret key, which should not be entered into any online tool.

JWT 解码器

解码和检查 JSON Web Token。查看头部、载荷和签名信息。

JWT Token

关于 JSON Web Token

JWT（JSON Web Token）是一种紧凑的、URL 安全的令牌格式，用于身份验证和信息交换。JWT 由三部分组成：头部（算法和类型）、载荷（声明和数据）和签名（验证）。JWT 常用于 OAuth 2.0、OpenID Connect 和 API 身份验证。

使用方法

Paste your JWT token in the input field
The header, payload, and signature are decoded automatically
View expiration time and other claims
Copy decoded sections as needed

使用场景

Debugging authentication tokens
Inspecting JWT claims and expiration
Verifying token structure during development
Understanding OAuth2 and API tokens

JWT 解码器

关于 JSON Web Token

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