What is advantage and disadvantage of server side JavaScript?

Question

As we know server side JavaScript is more popular these day every one talking about it
so i posting this question for identify advantage and disadvantage of serverside JavaScript

Answer 1

The main advantage is using JavaScript for everything. If you are alone you only need to know one language. If you are a business you only need to hire people who know JavaScript so you can hire them faster and pay them less than a Dev that knows js python PHP etc. It simplifies your "stack" because you will be using all JavaScript tech.

The main disadvantage would be that node.js, what you will be using for server side JavaScript, is single threaded so care must be taken to write the program in a way that won't slow down the application by tying up the process too long in one task. And that is something you'd need to how to do.