App with getData()

App.jsx

import React from "react";

class App extends React.Component {
  constructor (props) {
    super(props);
    this.state = {
      data: [],
      currentTicket: 0,
      finished: false,
      score: '',
    };
  }

  componentDidMount() {
    this.getData();
  }
  
  getData = () => {
    fetch('/tickets.json').then((response) => {
      return response.json();
    }).then((data) => {
      this.setState({ data });
    });
  }

  render () {
    return (
      <h1>Testas</h1>
    );
  }
}

export default App;