marli | : memo : Markdown tagged template literal renderer

I have been trying to make a website, that will get each image in a directory (server side) from a folder, and then call a function to display the current image in a card, and keep doing that until it has been done for every image.

I have this, probably very innefficient code:

Recently I had a school project in which I need to take a user input as an integer between 1-12 (representing the months of the year), and the age of the user, and do a math equation to produce a number that will spit out the age and birth month of the user (yes I know this is redundant but I have to do the math equation and not spit out the user inputs). Me being that one kid who wants an 100% tried to make it so that the user can input the month by string e.g(Jan = 1) using lists and if statements. The code bellow isn't working as whenever a user inputs something if statement doesn't change the birthNum variable. So please help me as i have tried almost everything and nothing works, but I feel as if I am so close to getting it to work.

Here is the code for turning the user input (string) into a integer:

I am a little bit stuck with my javascript/json. I've made a script, how loads json and puts it in html. Now my question, how can I update data. I want to make the script so, that when you try to press the button, the script updates the living place from the person.

Plaats = place postcode = zipcode