The library itself can be found in NPM https://www.npmjs.com/package/radar-diagram
npm install radar-diagram or
yarn add radar-diagram in you project to add it to your dependencies.
The demo radar can be found here https://radar.anilmaharjan.com.np/
In addition, I have used the library with ReactJs to demonstrate how it can be implemented in ReactJs.
The demo for React radar can be found here https://react-radar.anilmaharjan.com.np/