Get item count in getpocket.com by piggy backing on their cookie.

get-count.js

fetch('https://getpocket.com/v3/get?enable_cors=1&consumer_key=78809-9423d8c743a58f62b23ee85c', {
    method: 'POST',
    credentials: 'include',
    body: JSON.stringify({
        "detailType": "simple",
        "since": "1318881176"
    })
}).then((res) => res.json())
.then((data) => {
    console.log(data);
    console.log(Object.entries(data.list).length);
});