1. Node.js is useful for building one page, fast, light-weight, scalable applications. 2. It is not suitable for building computationally extensive applications, it may lead to bad performance.
I always used and develop API with RapidAPI so also recommend to new people to use and learn about APIs. If we discuss about new user it's so easy to learn and develop API free of cost as well as paid subscription. My experience with RapidAPI is awesome.
Node.js is easy and good to use, their support team is also good they always tend to help you, and solve your problem, even we know that Node is free to use and opensource but then also we get support from them but for getting much better results we need to purchase standard or enterprises support provided by them.
There is a smooth and seamless performance for multiple requests as the feedback received from users. and uses one platform to maintain UI and backend.
Firebase is also good tools for user who are working on APIs but the marketplace of Rapid API is non comparative. Like how it's creates APIs and testing phase, supporting of multiple API types etc. These features makes Rapid API very unique from else ones.