Make an API and a Web Form from the Same Function

Create a simple APIFunction to compute factorials.

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api = APIFunction["n" -> "Integer", #n! &]

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What if you want both an APIFunction for another website and a FormFunction for actual users visiting the website directly? Note that since FormFunction and APIFunction have the same signature, you do not have to rewrite any code.

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CloudDeploy[URLDispatcher[{ "/api" -> api, "/form" -> FormFunction @@ api }], "user:documentation@wolfram.com/application" ]

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Now you can visit https://www.wolframcloud.com/objects/documentation@wolfram.com/application/api?n=10 to use the API.

Or you can visit https://www.wolframcloud.com/objects/documentation@wolfram.com/application/form to use the form directly.