In this recipe, we will use most of the middleware functions provided by Helmet to secure our ExpressJS web application against common attacks. Before you start, create a new package.json file with the following content:

{ 
    "dependencies": { 
        "body-parser": "1.18.2", 
        "express": "4.16.3", 
        "helmet": "3.12.0", 
        "uuid": "3.2.1" 
    } 
} 

Then, install the dependencies by opening a Terminal and running:

npm install