Separate Business Logic from Routes

[josh-byster]

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As our application is growing now more complex with our business logic, our routes are becoming more packed with handling different scenarios and doing a lot in the route handler. It becomes difficult at that point to take pieces and reuse them in other route handlers.

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Extracting out all this business logic in our backend to a "service" layer as described here. This way, we have a separation of concerns and encapsulation of logic into different pieces which we can test and reuse throughout our code.

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