Dear frontend dev,

if you can't check whether a variable is defined or not, why do i have to change the back end to accept urlparam='undefined' as valid and replace it with your default value in my backend? Why are you afraid of 40X's? You should be interested in the bugs of your code.

It feels awful to have a middleware in place catching all errors and replacing them with empty 200 responses 😭. All of this because you don't fucking ensure your variables exist before use.