Guide to HTTP Requests in JavaScript

[mouakter14]

Interaction between the frontend and backend of websites is possible through HTTP requests. Functionalities such as updating a new/old user in a database, publishing a blog post from the WordPress dashboard , removing a profile picture, and updating your bio require interaction between a server and a client to modify the data.

When building web applications — both frontend and full stack web apps — we often interact with data stored in different databases and servers. These servers can belong to third parties or be created by the developers of a project.

To interact with these servers, we can make use of different HTTP methods to request data. We can create, read, update, and delete (or CRUD) data on the servers using specific HTTP verbs such as POST, GET, PUT/PATCH, and DELETE.

In this tutorial, you will learn the different ways you can make HTTP requests to remote servers and perform CRUD operations in JavaScript .

Each section will introduce a new method for sending HTTP requests. We'll start with built-in methods, such as the fetch API and the XMLHttpRequest object, before looking at some open-source HTTP request libraries, such as Axios and SuperAgent.

Let's get started!

What Is an HTTP Request in JavaScript?
HTTP requests in JavaScript are a set of predefined methods used to interact with data stored on servers.

Every request sent to a server includes an endpoint and the type of request being sent. You can think of an endpoint as a gateway between two programs: the client and the server.

The client is the program that sends a request, while the server is the one that receives the request. The server returns a response based on the validity of the request. If the request is successful, the server returns data in XML or JSON format (JSON in most cases), and if the request fails, the server returns an error message .

Responses returned by the server are usually associated germany whatsapp number data with status codes . These codes help us understand what the server is trying to say when it receives a request. Here are some of them and their meaning:

100-199 denotes an informative response.
200-299 denotes a successful request.
300-399 denotes a redirect.
400-499 indicates a client error.
500-599 denotes a server error .
We will talk more about some of them in the following sections.

In the next section, you'll see the different ways you can make HTTP requests in JavaScript.

How to Make an HTTP Request in JavaScript
This section will be divided into sub-sections, each of which will teach you different methods you can use to make HTTP requests in JavaScript.

Each method covered will have an example showing how to send POST, GET, PUT/PATCH, and DELETE requests to servers.

The JSON placeholder will serve as the remote server/endpoint where all our requests will be sent.

[yadaysrdone]

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