Component.js

import React, { Component } from 'react';

export default class UserData extends Component {
  constructor(){
    super();
    this.state = {
      name: ''
    };
  }

  componentDidMount() {
    this.setState({
      name: 'Jubileu'
    });
  }

  render() {
    return (
      <div className="user-data">
        <h2>{this.state.name}</h2>
      </div>
    );
  }
}