Summary  
This chapter explains how to apply core JavaScript concepts—variables, data structures, functions, and asynchronous code—within Node.js to build real backend functionality on a server.

General domain of usage  
Server-side application development


## What's Next

You've learned the core parts of JavaScript: variables, data structures, functions, and asynchronous code. These are the building blocks used in real applications.

So far, your code has been running as simple scripts. Now it's time to use JavaScript to build something more practical.

In the next step, you will start working with Node.js. This is where JavaScript runs on a server, handles requests, and becomes the foundation for backend development.

You already have the necessary basics. Now you will start using them to build real backend functionality.


Learn the core concepts of JavaScript needed for backend development, including variables, data structures, functions, and asynchronous code. Practice working with real data and understand how JavaScript behaves outside the browser. Build a strong foundation before moving on to Node.js and server-side development.

From JavaScript to Node.js

What's Next