Cordova Plugin Development Guide

https://cordova.apache.org/docs/en/latest/guide/hybrid/plugins/

Part 2. Core concepts

8. Creating custom plugins

8.3. Building an Android plugin

8.3.2. Writing the plugin code
cordova create hello com.example.hello HelloWorld

cordova platform add ios

plugman install --platform ios --project hello --plugin cordova-plugin-hello
8.3.4. Adding the plugin
cordova plugin add plugin-hello
Invalid Plugin! plugin-hello needs a valid package.json
Example 1. More plugins