How To Free Object In Javascript

As a JavaScript developer, you will often encounter situations where you create objects that consume memory in your application. To optimize the performance and prevent memory leaks, it is essential to understand how to properly free up these objects when they are no longer needed. In this blog post, we will discuss how you can effectively free objects in JavaScript.

Understanding Garbage Collection in JavaScript

JavaScript is a garbage-collected language, meaning that it automatically reclaims memory that is no longer in use. The JavaScript engine periodically runs a garbage collector that searches for objects that are no longer referenced by the application code and deallocates their memory.

However, this automatic garbage collection doesn’t mean that you shouldn’t care about freeing objects. Sometimes, objects can be held in memory accidentally, causing memory leaks. To avoid such issues, it’s essential to free the objects explicitly when you are sure that they will not be used anymore.

How to Free Objects in JavaScript

To free objects in JavaScript, you should remove all the references to the object from your code. Once there are no references to an object, the garbage collector will automatically reclaim its memory. Here are some ways to remove object references:

  • Set the object to null: The simplest way to free an object is by setting its reference to null. For example, if you have an object myObj, you can free it by assigning null to it: myObj = null;
    var myObj = {
        name: "John",
        age: 30

    // Free the object
    myObj = null;
  • Remove the object from an array: If the object is part of an array, you can remove it from the array using methods like splice() or pop().
    var myArray = [
        {name: "John", age: 30},
        {name: "Jane", age: 28}

    // Remove the first object from the array
    myArray.splice(0, 1);

    // Remove the last object from the array
  • Delete the object property: If the object is a property of another object, you can use the delete operator to remove it.
    var myParentObj = {
        childObj: {
            name: "John",
            age: 30

    // Delete the childObj property
    delete myParentObj.childObj;


Freeing objects in JavaScript is essential to ensure optimal performance and prevent memory leaks in your applications. By understanding how JavaScript’s garbage collection works and removing object references when they are no longer needed, you can help the garbage collector do its job more efficiently and improve the overall performance of your application.