How to join django and js

i have 2 questions.
I have been struggling with this problem for 2 days.

1.What to write in the url when using fetch on a local server

  let formData = new FormData();
  formData.append('sentence', textarea.value);
  let response = await fetch('', {
      method: 'POST',
      body: formData
    });
  console.log(response);
  
}```

   [enter image description here](https://i.stack.imgur.com/kjCFx.png) 

2.How to handle a request using django

```def check_name_s(request):
    if request.method == 'POST':
        print(loads(request.body))
    return 0```

   [enter image description here](https://i.stack.imgur.com/ZihbW.png)


I dont understand how to join.When i click on the post button, the request is sent, but with a 403 error.Sorry i have never worked with js and django