141.js

const URL = "https://jsonplaceholder.typicode.com/posts";

const xhr = new XMLHttpRequest();

xhr.open("GET", URL);
xhr.onload = () =>
{
    if (xhr.status >= 200 && xhr.status < 300)
    {
        const data = JSON.parse(xhr.response);
        console.log(data);
        const id = data[3].id;
        const xhr2 = new XMLHttpRequest();
        const URL2 = `${URL}/${id}`
        console.log(URL2);
        xhr2.open("GET", URL2);
        xhr2.onload = () =>
        {
            const data2 = JSON.parse(xhr2.response);
            console.log(data2);
        }
        xhr2.send();
    }
    else
    {
        console.log("something went wrong");
    }
}

xhr.onerror = () =>
{
    console.log("network error");
}
xhr.send();