How to make HTTP request in JavaScript?

Making HTTP requests in JavaScript is an essential part of building modern web applications. In this article, we will explore two popular ways to make HTTP requests in JavaScript: using the built-in fetch API and using the XMLHttpRequest (XHR) object.

Using the fetch API

The fetch API provides a simple and straightforward way to make HTTP requests in JavaScript. It is available in most modern web browsers and is used extensively in modern web development.

Basic usage

Here's an example of how to use the fetch API to make a simple GET request:

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

This code will make a GET request to the URL https://api.example.com/data and then parse the response as JSON data. If the request is successful, the JSON data will be logged to the console. If an error occurs, the error will be logged to the console.

Using request options

The fetch function takes a second argument, an options object, which allows you to configure the request in more detail. Here's an example of how to use some of the available options:

fetch('https://api.example.com/data', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ name: 'John', age: 30 }) }) .then(response => response.json()) .then(data => console.log(data)) .catch(error => console.error(error));

This code will make a POST request to the URL https://api.example.com/data with a JSON payload containing the name and age properties. The Content-Type header is set to application/json to indicate that the payload is JSON data.

Handling errors

In the examples above, we used the catch method to handle errors that occur during the request. The catch method is called if the request fails due to a network error, an invalid URL, or a server error (such as a 404 or 500 response).

fetch('https://api.example.com/data') .then(response => { if (!response.ok) { throw new Error('Network response was not ok'); } return response.json(); }) .then(data => console.log(data)) .catch(error => console.error(error));

This code will check if the ok property of the response is true, which indicates that the response was successful. If the ok property is false, the code will throw an error, which will be caught by the catch method.

Using the XMLHttpRequest (XHR) object

The XMLHttpRequest (XHR) object is a traditional way to make HTTP requests in JavaScript. It is supported in all modern web browsers and provides more control over the request than the fetch API.

Basic usage

Here's an example of how to use the XHR object to make a simple GET request:

const xhr = new XMLHttpRequest(); xhr.open('GET', 'https://api.example.com/data'); xhr.onload = function() { if (xhr.status === 200) { const data = JSON.parse(xhr.responseText); console.log(data); } else { console.error('Request failed. Returned status of ' + xhr.status); } }; xhr.send();

This code creates a new XHR object and opens a GET request to the URL https://api.example.com/data. The onload function is called when the response is received. If the response status.

Front-end and back-end web development can be separated. They can alternatively be referred to as server-side and client-side. The front-end concentrates on what users see, whereas the back-end is concerned with the application logic.

Although though the two sorts of advances are distinct from one another, they nonetheless require a communication channel. The client (browser), in order to obtain the required data, must send HTTP requests to the server when a user is visiting a website.

98% of websites will employ Javascript on the client side for webpage behaviour by the year 2022. You must learn how to make an HTTP request in Javascript if you are conducting front-end programming. You can utilise some of the methods listed in this article.

Conclusion.

Each approach has pros and cons, despite the fact that some are more recent and some offer more features. The approach that most closely matches the demands of your project should be used.

You may test them out by creating a straightforward project using these instructions while determining which approach to utilise for your project:

Thank you :)