JavaScript Heap Out Of Memory Error

I’ve encountered this scary-looking error on multiple occasions when my application ran out of memory.

In this short article, I’ll first give you a solution that you can use to fix this issue quickly.

After that, in case you want to know more about it, I’ll explain what the causes of this error can be and how to prevent it from happening in the future.

• How to solve the “Heap out of memory” error in JavaScript
• What does this error even mean?
• The memory limits of different Node.js versions
• How to prevent Node.js from running out of memory
• Conclusion

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How to solve the “Heap out of memory” error in JavaScript

The fastest way of solving this issue is by increasing the memory limit of Node. Starting from Node.js v8, you can set the limit in MB with the --max-old-space-size flag like this:

node --max-old-space-size=4096 index.js

4096 translates to 4 GB of memory. You can set the limit to whatever you like, but make sure you don’t use all the available memory, or otherwise, your system might crash.

As an alternative to this, you can also set the flag in an environment variable like this:

NODE_OPTIONS="--max-old-space-size=4096" node index.js

Change the Node.js memory limits of your environment

If you want to change the memory limits of Node.js for your entire environment, you need to set the following variable in your environment’s configuration file. (.bashrc, .bash_profile, sometimes .zshrc, etc.)

Add this line to your configuration file:

~/.bashrc

export NODE_OPTIONS=--max_old_space_size=4096

“npm install” heap out of memory

If you run into this issue when installing a package with npm or yarn, you can bypass the memory limit temporarily by installing the package as follows:

node --max-old-space-size=4096 $(which npm) install -g nextawesomelib

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What is GEEK

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What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

• For single line comment in JavaScript we have to use // (double slashes)
• For multiple line comments we have to use / * – – * /

<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

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The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

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JavaScript Memory Management System

The main goal of this article is to help to readers to understand how memory management system performs in JavaScript.

I will use a shorthand such as GC which means Garbage Collection. When the browsers use Javascript, they need any memory location to store objects, functions, and all other things. Let’s deep in dive that how things going to work in GC.

The JavaScript Engine’s Garbage collector’ looks out for objects which are unreachable and also removed from the memory.

So I will share an example below and show you steps that will be needed to work with GC.

var number = 50;                // allocates memory for a number

var string = 'textual data';  // allocates memory for a string
var object = {x: 10};         // allocates memory for an object
var x= [10, null, 'abra'];     // allocates memory for the array
function f(x) {               // allocates memory for a function
return x * 2;
}                              

The example shows how JavaScript allocates memory for the variables when they declare. But when the memory is no longer needed, the allocated memory will be released. GC finds the memory no longer used by the application and releases it. But the main question is that how GC finds the memory no longer used?

The basic algorithm for doing that is called “mark-and-sweep”.

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