why we use csrf token in django api code example

Example 1: csrf token django

Cross Site Request Forgery protection¶
The CSRF middleware and template tag provides easy-to-use protection against
Cross Site Request Forgeries. This type of attack occurs when a malicious
website contains a link, a form button or some JavaScript that is intended 
to perform some action on your website, using the credentials of a logged-in 
user who visits the malicious site in their browser. A related type of attack,
‘login CSRF’, where an attacking site tricks a user’s browser into logging into
a site with someone else’s credentials, is also covered.

The first defense against CSRF attacks is to ensure that GET requests
(and other ‘safe’ methods, as defined by RFC 7231#section-4.2.1) are
 side effect free. Requests via ‘unsafe’ methods, such as POST, PUT,
 and DELETE, can then be protected by following the steps below.

Example 2: csrf token djnago

function getCookie(name) {
    let cookieValue = null;
    if (document.cookie && document.cookie !== '') {
        const cookies = document.cookie.split(';');
        for (let i = 0; i < cookies.length; i++) {
            const cookie = cookies[i].trim();
            // Does this cookie string begin with the name we want?
            if (cookie.substring(0, name.length + 1) === (name + '=')) {
                cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                break;
            }
        }
    }
    return cookieValue;
}
const csrftoken = getCookie('csrftoken');