email-validator | Small PHP library to valid email addresses | Email library

I need to make unit tests for some post requests but i dont understand how.I tried with mswjs but the test passes because i'm missing something and i dont know what.I tried to test the requests in an usual way but i wasnt able to put my conditions there and it was sending only 200 status code..
To start with,this is my folder structure:

I am using FastApi and My responseModel is being ignored. I am attempting to NOT return the password field in the response. Why does FastApi ignore my responsemodel definition?

Here is my api post method:

I have a task to

• Implement the functionality of sending a user's email to the server when they click on the "Subscribe" button. To do this, make a POST Ajax request using the /subscribe endpoint.
• Implement the functionality of unsubscribing the user's email from the community list when they click on the "Unsubscribe" button. To do this, make a POST Ajax request using the /unsubscribe endpoint.
• Prevent additional requests if the "Subscribe" and "Unsubscribe" buttons are pressed while requests to the /subscribe and /unsubscribe endpoints are in progress. Also, disable them (using the disabled attribute) and style them using opacity: 0.5. using React.Redux library is prohibited.

So,i have did this task,but the problem is that my form is not doing unsubscribe state,it leaves the email unchanged and the button doesnt change its state from unsubscribe to subscribe,but as a result,when an email is valid,it should give the possibility of sending subscribe fetch request to the server and the button text to change in Unsubscribe and the display of the form to be none,but if the email is not valid,then the button should have the Subscribe text,no fetch request possibilities and the input form to have the display block.Besides this,the value to be stored in local storage and when the page refreshes it leaves the form in the state it was,if was subscribed then all the changes for subscribe are actual and if not than vice-versa.
I have did this task using only javascript and it works as follows:
non-valid email:

valid email:

So,the question is,what i am doing wrong? Why only subscribe fetch works and how to fix the form to make the requested result,i'm exhausted,three days i try to answer this question and i dont understand anything.. please help,thanks in advance!

JoinUsSection component with the form :

I just want the poetry equivalent of this:

I have a problem when I run composer update for any project in laravel. It give me this error: Your requirements could not be resolved to an installable set of packages.

I have a section on a webpage for a task :

In the form i write an email which is 'validated' later with a function.First when i submit an email which passed the validation it sends a sendSubscribe function to the server,after that i click the button unsubscribe and it sends a unsubscribeUser function.But,after that,when i click on the email input,it starts to send unsubscribe fetch requests everytime and when i click on the subscribe button it also does the same.
The network tab looks like this:

I think i know which is the problem,but i dont know how to fix it.My idea is that everytime i click on the subscribe button it ataches an event listener from the function,thats why it fires multiple unsubscribe requests.

Subscribe functions : the subscribeEmail is the most important

My root project folder is:

I am testing express app deployment on firebase using firebase functions. But after using the command firebase serve. I am getting EADDRINUSE: address already in use :::3000. Here is my index.js

I have a form where i enter an email and it gets ''subscribed'' in a user.json file using a fetch api on node server.My task is to :

• upon clicking on the "Unsubscribe" button, implement the functionality for unsubscribing from the community list. For that, make POST Ajax request using http://localhost:3000/unsubscribe endpoint.

I tried to make the function but it wasnt succeseful so i deleted it. Also,i need to do the following :

• While the requests to http://localhost:3000/subscribe and http://localhost:3000/unsubscribe endpoints are in progress, prevent additional requests upon clicking on "Subscribe" and "Unsubscribe". Also, disable them (use the disabled attribute) and style them using opacity: 0.5.
  For me ajax requests,fetch and javascript is something new,so i dont know really well how to do this task,if you could help me i'll be happy,thanks in advance.

fetch code for subscribing: