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What did you find difficult while building the project?

Setting up the server, I had a hard time deciding where I would have the inputted email checked. I ended up deciding to have it checked via the post body in my server.js and called for the page to be rendered based off the result.

I wondered if there were possibly a better and simpler way to do this in just the front end. But I also figured if this were fully setup, it would be safer to have the validation in the backend anyways, though having it both in the front and back would be best. So had I made a validator first in the front, it would probably have responded faster to the first checks if any.