is a term used in many different ways within software development, but we’re referring to it as a way to wrap requests and responses in simple abstracted functions which can be applied to some routes easily.
In our example below we’re using an AuthMiddleware to check incoming requests for the correct api key and rejecting them if they don’t. Another good example for this technique is applying headers to responses, if you know the content type of the response, we can set it in middleware.



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