An API, or Application Programming Interface, is a set of established protocols for external programs to interact with your application . As you said, the users parsed the javascript and discovered the URL’s that you use, and then built programs using those URL’s to interact with your app.
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An API (Application Programming Interface) is a set of functions that allows applications to access data and interact with external software components, operating systems, or microservices . To simplify, an API delivers a user response to a system and sends the system’s response back to a user.
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