Step 1: Download and install your pre-requisites. Download the latest LTS version of Node.js. The LTS versions are their current, stable versions.
Step 2: Express actually comes as a package for Node. You should install it using Node’s built in package manager.
In the folder your website is in, click File -> Open command prompt
Once a window opens input npm init
This will aid you in starting a new node project. It will ask you a few questions, like anything you ever install does. For the most part you can be lazy and just keep hitting enter until it finishes. You will now have a file named package.json This file tells node about your project; it also stores information about any packages you have installed for it.
Step 3: Input npm install --save express
This will install the express package and save the package to the package list in package.json.
Step 4: You’re now ready to start coding your server.