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Im having trouble trying to connect json file to javascript can anyone help me out please

I tried using switch function in javascript to make my code cleaner but somehow i couldn't get the hang of it. So instead i had to hard-code it but I'm sure there is a much better way to avoid many lines. Also during javascript manipulation i wanted to have a transition delay but i couldn't find a way, if there is a way to do this please help out.

I wanted to check the responsiveness for my project but there was some security issues from github not allowing me to check my website through a responsive website checker for different devices.Could anyone show me how you checked yours.

my image is working on vscode but uploading it on github its not showing could someone help me out.