@amplitude/ua-parser-js

Detect Browser, Engine, OS, CPU, and Device type/model from User-Agent data. Supports browser & node.js environment

jquery-form

The jQuery Form Plugin allows you to easily and unobtrusively upgrade HTML forms to use AJAX.

jquery-serializejson

jQuery or Zepto plugin to serialize a form into a JavaScript Object, using the same format as the default Ruby on Rails request params