show Socket data in render method

App.js

render() {
    const { data } = this.state;
    return (
      <div className="App">
        <h2>Hello world</h2>
        {Object.keys(data).map((key, index) => (
          <div key={index}>
            <div>{key}</div>
            <div>{data[key]}</div>
          </div>
        ))}
      </div>
    );
  }