var phpurlencode = require('phpurlencode');

var encodedString = phpurlencode("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.67 Safari/537.36");
console.log(encodedString);
// => Mozilla%2F5.0+%28Macintosh%3B+Intel+Mac+OS+X+10_12_2%29+AppleWebKit%2F537.36+%28KHTML%2C+like+Gecko%29+Chrome%2F56.0.2924.67+Safari%2F537.36

var encodedString = phpurlencode.encode("!@#$%^&*()-+='\"");
console.log(encodedString);
// => %21%40%23%24%25%5E%26%2A%28%29-%2B%3D%27%22

var decodedString = phpurlencode.decode('%21%40%23%24%25%5E%26%2A%28%29-%2B%3D%27%22');
console.log(decodedString);
// => !@#$%^&*()-+='"

// Register String prototypes. 
// Once this function is called, the String prototypes will be available across your entire project
phpurlencode.definePrototypes();

var decodedString = '%21%40%23%24%25%5E%26%2A%28%29-%2B%3D%27%22'.urldecode();
console.log(decodedString);
// => !@#$%^&*()-+='"

var encodedString = decodedString.urlencode();
console.log(encodedString);
// => %21%40%23%24%25%5E%26%2A%28%29-%2B%3D%27%22