Scalability is a hot topic in tech, and every programming language or framework provides its own way of handling high loads of traffic. Today, we’re going to see an easy and straightforward example about Node.js clustering. This is a programming technique which will help you parallelize your code and speed up performance. “A single instance of Node.js runs in a single thread. To take advantage of multi-core systems, the user will sometimes want to launch a cluster of Node.js processes to handle the load.” - Node.js Documentation We’re gonna create a simple web server using Koa , which is really similar to Express in terms of use. The complete example is available in this Github repository . What we’re gonna build We’ll build a simple web server which will act as follows: Our server will receive a POST request, we’ll pretend that user is sending us a picture. We’ll copy an image from the filesystem into a temporary di...