Finding duplicate keys in JavaScript object

Question

I have a file whose sole purpose is to provide an enormous collection of key/value pairs in an object. It looks something like this:

var myobj = {
   some_ke         


        

Answer 1

Add "use strict"; to the top of your file. Example usage:

(function() {
  "use strict";
  // Throws a syntax error
  var a = {
    b: 5,
    b: 6
  };
})();

Edit: This answer is no longer strictly up to date due to ES6 computed property values. If you want, you can write your object as a JSON object (if that's possible) and put it through http://www.jslint.com/, which will check for duplicate keys. See as well: "use strict"; now allows duplicated properties?