Fetch data externally from API in ReactJS

Have you ever tried creating a ReactJS application and wondered how to import data that is managed by an external service? Well I have, and here I will show you an example of how it is done.

The job of ReactJS is to render UI components based on props and state. To get external data into your web app, you can perform these steps:

  1. Fetch data from the external service. We can use the axios http library to make the request to the external API. Note that we chain the request with a .then( ... ) to parse the response.
    const url = /* API endpoint here */;
    axios.get(url).then(res => {
     /* parse response here */
  2. Store it into the component’s state. We can do this by parsing the API response and setting the component’s state.
    const users = res.data.results;
    this.setState({ users });
  3. Re-render component after it is added to the DOM. We can achieve this by adding steps 1 & 2 into the componentDidMount lifecycle method.
    componentDidMount() {
     /* code from steps 1 & 2 here*/

See my example here: https://codesandbox.io/s/loving-shtern-fln8d

Written on June 22, 2020