Web APIs serve requests with data and respond with processed data over the HTTP, that is, the internet. Web API does the necessary work of dealing with data, either confidential, personal, or business related, in the form of CRUD operations. Any layman would understand that CRUD operations on data shouldn't be performed by everyone.
With positive or negative intentions, web API designs will be exposed to the outside world to sneak in without permission. The security of web API should be our foremost priority, and the focus should be on who will access it, what they will access, and how safe is the data that is communicated.
In this heterogeneous world of web applications, mobile apps, server-server communication, desktop apps, and so on, the security of web API should be seamless across them to avoid hassles in switching the clients. It should be designed...