Learn the basics of Node.js with its core features to advanced concepts through focused lessons and hands-on practice.

Become a Node.js Developer

Node.js is an open-source, cross-platform, JavaScript runtime environment that executes JavaScript code outside of a web browser. This module is your guide for learning the fundamentals of Node.js.

We’ll start by understanding the inner workings of Node.js. More specifically, explore its features, how event loops work, and how multithreading works. We’ll then move on to the fundamentals of Node.js, like file systems, global objects, and the Buffer class.

In the latter half of the module, we’ll explore more advanced concepts like modules, events, and packages. At the end of this module, we’ll get hands-on with Node.js and create our own food delivery web application.

By the end of this module, you’ll have a new, in-demand skill to put on your resume and a cool project to add to your portfolio.

Node.js Essentials

Which of the following does not need to be imported?

Which of the following does not need to be imported?

أي مما يلي لا يحتاج إلى الاستيراد؟

The first argument passed from the command line


What does <code>process.argv[1]</code> return?

ماذا يفعل<code style="text-align:right;direction:ltr;unicode-bidi:bidi-override;">process.argv[1]</code> يعود؟

An error occurred and returned the following:
```
at someFunction (/usercode/index.js:12:7)
```
Where does the problem #key# originate: begin #key#?

An error occurred and returned the following:
<pre><code>at someFunction (/usercode/index.js:12:7)
</code></pre>
Where does the problem <keyword><word>originate</word><meaning>begin</meaning></keyword>?

حدث خطأ وأعاد ما يلي:<pre style=";text-align:right;direction:rtl"><code style="text-align:right;direction:ltr;unicode-bidi:bidi-override;">at someFunction (/usercode/index.js:12:7)
</code></pre> أين المشكلة<keyword><word> أصلها</word><meaning> يبدأ</meaning></keyword> ؟

What will be the output of the following?
```
const buf4 = Buffer.from([255, 257]);
console.log(buf4)
```


What will be the output of the following?
<pre><code>const buf4 = Buffer.from([255, 257]);
console.log(buf4)
</code></pre>

ما هو إخراج مما يلي؟<pre style=";text-align:right;direction:rtl"><code style="text-align:right;direction:ltr;unicode-bidi:bidi-override;">const buf4 = Buffer.from([255, 257]);
console.log(buf4)
</code></pre>

Once the object emits a specific event, its **listener** functions are called _______.



Once the object emits a specific event, its listener functions are called _______.

بمجرد أن يصدر الكائن حدثًا معينًا، تسمى وظائف المستمع الخاصة به _______.

No, the callback function is not taking care of the error.


No, the argument to read the data is not passed to the callback.


Will this piece of code return the text in the file test.txt? If not, what is the error in this code?
```
fs.readFile('test.txt', 'utf-8', (data) => {
  console.log(data)
})
```


Will this piece of code return the text in the file test.txt? If not, what is the error in this code?
<pre><code>fs.readFile('test.txt', 'utf-8', (data) =&gt; {
 console.log(data)
})
</code></pre>

هل سيعيد هذا الكود النص الموجود في ملف test.txt؟ إذا لم يكن كذلك، فما هو الخطأ في هذا الكود؟<pre style=";text-align:right;direction:rtl"><code style="text-align:right;direction:ltr;unicode-bidi:bidi-override;">fs.readFile('test.txt', 'utf-8', (data) =&gt; {
 console.log(data)
})
</code></pre>

اختبار قصير لتنشيط ذاكرتك.

Introduction

Fundamentals

NodeJs core features

Packages

Project

Appendix

Conclusion

Quiz Yourself on Node.js Fundamentals