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Singletons are the one's that can be initialized only once.

In the simplest possible terms here is a singleton for you.

var singleton = {
    key: "value"
};

Another way

var Singleton = (function(){
    var instance;
    var SingletonClass = function(){
        this.someProp = "someValue";
        // all other stuff you want on your singleton instance;
    };

    return {
        getInstance: function(){
            if(!instance){
                instance = new SingletonClass();
            }
            return instance;
        }
    }
})();

var aSingleton = Singleton.getInstance();
var bSingleton = Singleton.getInstance();

console.log(aSingleton.someProp); //someValue
console.log(bSingleton.someProp); //someValue

aSingleton.someProp = "someOtherValue";

console.log(a.someProp); //someOtherValue
console.log(b.someProp); //someOtherValue

In case you want to use new keyword for initialization

var Singleton = (function () {
    var instance; 
    function SingletonClass() {
        this.someProp = "someValue";
        // all other stuff you want on your singleton instance;

        if (instance) {
            return instance;
        }
        instance = this;
    }
    return SingletonClass;
}());

var aSingleton = new Singleton();
var bSingleton = new Singleton();

console.log(aSingleton.someProp); //someValue
console.log(bSingleton.someProp); //someValue

aSingleton.someProp = "someOtherValue";

console.log(aSingleton.someProp); //someOtherValue
console.log(bSingleton.someProp); //someOtherValue

Hope it helps.