What is REST API in React.js?

React.js is not just about client-side rendering. It also offers REST APIs for server-side rendering and use cases like web crawlers, offline data storage, etc.

REST is a type of API that provides a way for web and mobile applications to communicate with each other. It is an out-of-the-box service that can be used in any web application built on React.js.

It is also a top choice for developers looking to make their React application scalable as it provides high availability, low latency, and consumes less bandwidth over the network.

The goal of this article is to provide a brief overview of REST API in React.js and how it can be used in various applications-

What is RESTAPI?

REST API stands for Representational State Transfer application programming interface, sometimes referred to as the RESTful API, and it’s the primary interface that is used by React.js developers which allows API connections between different parts of an application or service over the internet.

Developers can combine applications more efficiently and with greater versatility using REST APIs. Furthermore, it has become the technique that microservices systems employ the most frequently.

Another thing that makes the REST API so beneficial is that there are no constraints on how data can be represented and transferred between servers, browsers, databases, and other networks.

Principles Of REST APIIn React

A service or application can access information located inside another service or application using an API. In contrast to the program or service that contains assets, the one that accesses data is called the "server." REST API may theoretically be created in any computer language and covers many file formats.

Stacking Systems

A design can be hierarchical, thanks to the layered system. This restriction restricts the connection of elements outside of the local layer. The responses and calls pass via many levels since no level can view at any other level. This idea permits the addition of new commands while maintaining the functioning of existing ones.

Standard Interface

The main characteristic which sets the REST architectural design apart from various network-based designs is its uniform interface. It establishes a standard contract that forbids the usage of independent or multiple interfaces inside an API.

Regardless of the location developers made this request, all APIs accessing the same information should have the same appearance (Idempotent).


This is indeed an additional restriction applied to the REST architectural tenet. It forbids retaining information on the servers and requires every "request" to contain all data sent between server and client. Since it lessens the effects of statelessness, information must be cacheable on that server or client side.

The classification of content as non-cacheable or cacheable in a request's response, whether explicit or implicit, is considered by cache limitations. When a response is marked as "cacheable," client caching is permitted to utilize the received data for subsequent, identical queries.

Decoupled Service

The isolation between the server and client is referred to as client-server decoupling. Despite having various characteristics and listening to queries, a server will always approve or decline a request from a client. The performance of server modules and the user interface's mobility is enhanced via client-server decoupling.

Characteristics Of REST API in React

React is designed to support a unidirectional data stream. You have better influence over the application when using one-way data binding. ReactJS is built on parts, and a ReactJS app's components have controls and logic. Managing the software while operating on more significant projects is simpler because You can reuse these elements.

Because React combines basic JavaScript and HTML concepts with certain helpful additions, it is easy to comprehend.

React leverages Virtual DOM to hasten web application development. As with conventional web apps, Virtual DOM examines the earlier configurations of the elements and then updates only the portions of the Real DOM which have been modified. Because React uses a JSX document, the app is simple to create and comprehend.

Benefits Of REST APIs

  • REST APIs are said to be relatively simple to grasp and comprehend.

  • Any language or platform may use and readily operate a REST API that isn't language or platform-specific.

  • For foreign customers, creating a flawless REST API is relatively simple.

  • In comparison to their competitors, these are also simpler to expand.

  • With the aid of REST APIs, engineers may divide complex programs into simple elements.

Ways To Utilize React To Consume REST APIs

There are many approaches to using REST APIs in the React app; however, in this tutorial, we'll focus on the two most common methods: Fetch API (an in-built web browser API) and Axios (the promise-based HTTP browser).

Important Note

You ought to be acquainted with React hooks, React, and JavaScript because they are essential to understanding this article.

It's crucial to realize that using APIs in React differs significantly from using them in JavaScript before you explore how to accomplish so. This results from such requests currently being handled by a React Component. Moreover, you'll be employing core elements in this scenario, and therefore you'll have to employ two essential React Hooks -

useState Hook

You need to set up a context where You will keep the information until it is delivered when you execute a data request. You may save it in the context object or a state administration framework like Redux, and you'll save the supplied information in the local state of React.

const [posts, setPosts] = useState([]);

useEffect Hook

Inside this useEffect() hook of React, API queries are made. Once the application installs, it displays instantly or waits until a certain status is reached. The overall syntax you'll employ is as follows -

useEffect(() => {
   // data fetching here

}, []);


Companies use JavaScript to develop interactive web apps. Nevertheless, using HTML strings involves extensive coding to create large-scale online applications.

React improves efficiency with better performance and lesser codes since it gives developers more flexibility when creating machine-readable programs. Accessing your React REST API guarantees quick performance and an improved UI in the front-end dynamic web app.

Updated on: 07-Dec-2022

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