With the advent of REST server in v18, 4D can serve as a powerful backend to any web application. Many 4D REST APIs are now available for developers to utilize in their web apps. Among these include a login API that can be integrated with 4D’s user authentication system. Project mode offers a way to use customized APIs by allowing developers to create ORDA class functions and calling them via POST requests. 4D REST APIs also offer the ability to conveniently filter for certain entities and attributes. This technical note will demonstrate how to utilize all of the aforementioned APIs in building a basic web application with a ReactJS frontend.

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