Retrieve a JSON config object from URI parameter

uri.config.js

var config = (function() {
    var s = document.getElementsByTagName('script');
    var uri = Array.prototype.slice.call(s).slice(-1)[0].src.match(/\?.*/g)

    return uri.length > 0 ? JSON.parse('{"' + decodeURI(uri[0].substr(1)).replace(/"/g, '\\"').replace(/&/g, '","').replace(/\=/g,'":"') + '"}') : {}
})()

/*
  <script type="text/javascript" src="script.js?foo=bar"></script>
  
  config -> {"foo": "bar"}
*/