React Hooks tutorials for beginners-5


Welcome to part-5 of the series. You can find part-4 here. We will look into doing API calls with useEffect in this part.

Fetching data with useEffect

In this part, we will fetch data from an API endpoint. We will first install the axios package to do api call. Open the terminal and run below command.

npm install --save axios
axios install

Now, create a new file DataFetching.js inside the components folder. Inside useEffect we are using axios to hit the API endpoint, which is returning a promise.


After this include the component in App.js file.


Now, in localhost we can see the data been received in the console.


Now, we will set the state to show the posts on the screen. We will just pass to setPosts.


Now, we will get the posts title displayed, but we get an issue and that is the infinite call to the api endpoint.

Api infinite

We can fix it easily, because we want the data to be fetched only once and mimic the componentDidMount lifecycle method. As from the earlier part, we do this my specifying an empty array as the second parameter.

empty array

Now, back to localhost and our issue is resolved.

Issue resolved

We will now learn how to fetch individual posts through useEffect now.

For this we need to hit the endpoint like, where each number represent a post.


Now, create a new file DataFetching2.js inside the components folder. It is mostly similar to DataFetching.js, but have a input box which contains it’s set of state.

We are also hitting a different API end point and instead of passing an empty array as second parameter, we are passing id. We are passing id, because the useEffect should trigger if the state variable id is changed. The id is changed through the input box.


Now, include the DataFetching2 in App.js file.


Now, in localhost, we will see the single post title and also the new title, if we change it from the input box.


This completes part-5 of the series. You can find part-6 here.

You can find the code for the same in this github repo.




Founder TWD, JavaScript & ReactJS Trainer, Youtuber, Blogger

Love podcasts or audiobooks? Learn on the go with our new app.

Recommended from Medium

Leetcode 5453. Running Sum of 1d Array

Ans: In computer science, a primitive is a fundamental data type.

React Router v5 with a Project

30 Day code challenge-python

Using index files for importing from multiple files within a module

Directory Structure

Convenient Tactics of Logging in NodeJS and JavaScript in the Browser

Node.js Middleware

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store
Nabendu Biswas

Nabendu Biswas

Founder TWD, JavaScript & ReactJS Trainer, Youtuber, Blogger

More from Medium

ReactJS Tutorial Part #4 ~ ReactJS Components

How to use react clean-up function with example

Learning React with TypeScript by Building an API app

Introduction of React JS