react-fetch.js

import React from 'react';

export default class FetchData extends React.Component {
  constructor() {
    super();

    this.state = {
      data: null,
      isLoading: false,
      error: '',
    };
  }
  componentDidMount() {
    this.setState({ isLoading: true });
    fetch('https://httpbin.org/anything')
      .then(response => response.json())
      .then((data) => this.setState({
        isLoading: false,
        data: data,
      }))
      .catch(error => {
        console.log(error);

        this.setState({
          isLoading: false,
          error: error.toString()
        });
      });
  }
  render() {
    if (this.state.isLoading) {
      return <div>Cargando...</div>;
    }
    if (this.state.error) {
      return <div>{this.state.error}</div>;
    }

    console.log(this.state.data);

    return <div>{JSON.stringify(this.state.data)}</div>
  }
}