Node.JS is an open-source, javascript-based runtime environment used for creating server-side and networking applications. It is famous for high performance, can run on any platform, and most importantly, easy to implement.
If you decide to go with this environment, you need to hire node.js developer for that. An expert in Node JS will help you to create the server-side of your application with ease.
How much does it cost to develop a node js app? I cannot give you an answer. It all depends on the location and expertise of a developer working on your project. For example, in Western Europe and the US, developers charge up to $100 per hour, and if you check Easter European rates, there will be $20-35 per hour.
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