Remove duplicate objects in an array of object in JavaScript

function remove_duplicates(objectsArray) {
    var usedObjects = {};

    for (var i=objectsArray.length - 1;i>=0;i--) {
        var so = JSON.stringify(objectsArray[i]);

        if (usedObjects[so]) {
            objectsArray.splice(i, 1);

        } else {
            usedObjects[so] = true;          
        }
    }

    return objectsArray;

}