Prerequisite before obfuscating Javascript code?

Question

I tried different obfuscation tools for JavaScript, but when I use resultant it does not work.

I removed all comments, single-line and multi-line comments, and beautified the code in order to have proper semi-colon and proper formatting.

My question is : What are the prerequisites before obfuscating the code?

Answer 1

If your code doesn't have any errors or warnings when debugging, then it should obfuscate. Read more about the tool you're using to make sure it supports your JavaScript implementation.

Answer 2

• Make sure that your code runs inside an Immediately-Invoked Function Expression (see below example)
• Do not rely on global variables (or explicitly pass them in as below for $)
• Use the passed in object to create any globally exposed objects/methods (window.somename = {})
• Use event binding, not on* attributes in your html markup.

If your code can run in relative isolation as below, it should be able to obfuscate very well...

Example:

(function(window, $){
  //your code here

  //create global namespace - expose classes/methods
  window.MyProject = {
    someMethod: someInternalMethodToExpose
    SomeClassName: SomeClass
  };

  //internal stuff
  function someInternalMethodToExpose() {
    ...
  }

  //constructor function
  function SomeClass() {
    ...
  }
  SomeClass.prototype.someMethod = function() {
    ...
  }
}(window || this, jQuery));