JWT Decoder
Decode and inspect JSON Web Tokens: read header and payload, check expiry and debug API authentication. Fully processed in your browser.
Runs in your browser
Real-time
JWT
Header
Payload
时间声明
验签
Algorithm
—
解析在本地完成；验签也只在你输入密钥后于浏览器内计算，token 不会上传。
About this tool
Decode and inspect JSON Web Tokens: read header and payload, check expiry and debug API authentication. Fully processed in your browser.
How to use
- Fill in the input box above, or click "Fill sample" to try it instantly
- Adjust the options as needed — results update as you type
- Click "Run" to get the result, then copy or export it in one click
Tips
- Runs entirely in your browser — your data never leaves the device
- Completely free, no registration, no usage limits
- Most tools compute in real time as you type