You can make HTTP requests in JavaScript using the XMLHttpRequest object or using the more modern fetch API.

Here’s an example of using XMLHttpRequest to make a GET request:

var xhr = new XMLHttpRequest();
xhr.open('GET', 'https://api.example.com/data', true);

xhr.onreadystatechange = function () {
  if (xhr.readyState === XMLHttpRequest.DONE && xhr.status === 200) {
    console.log(xhr.responseText);
  }
};

xhr.send();

And here’s an example of using the fetch API:

fetch('https://api.example.com/data')
  .then(response => response.text())
  .then(data => console.log(data))
  .catch(error => console.error(error));

Note that fetch returns a Promise that resolves to the response object, which contains the response from the server. You can then use .text() to get the response body as text. You can also use .json() if the response from the server is in JSON format.