You can use any type of database with Node.js as long as you can find a package with the necessary drivers to let Node.js interact with the database system. Thankfully, there are free packages available from NPM for most popular database systems. If you’re just getting started, you might want to stick to MongoDB. It is designed to work well with data in JSON format, which JavaScript is great at working with as well. Also, it is the database system used by most tutorials to teach Node.js, so you’ll have access to a greater number of educational materials if you pair your Node.js application with a MongoDB database.