CODE EXAMPLE FOR JAVASCRIPT

https://stackoverflow.com/questions/51115640/how-to-send-form-data-from-react-to-express/51116082

class Register extends Component {
  constructor(props) {
    super(props)
    this.state = {
      first_name: '',
      last_name: '',
      email: '',
      password: '',
      phone: ''
    }
  }

  onChange = (e) => {
    this.setState({ [e.target.name]: e.target.value });
  }

  onSubmit = (e) => {
    e.preventDefault();
    // get form data out of state
    const { first_name, last_name, password, email, phone } = this.state;

    fetch('http://localhost:4000/api/users/register' , {
      method: "POST",
      headers: {
        'Content-type': 'application/json'
      }
      .then((result) => {
        console.log(result)
      })
  })
}
      render() {
        const { classes } = this.props;
        const { first_name, last_name, password, email, phone } = this.state;
        return (
          <div className="session">
          <h1>Create your Account</h1>
            <div className="register-form">
              <form method='POST' action='http://localhost:4000/api/users/register'>
                <TextField label="First Name" name="first_name" />
                <br/>
                <TextField label="Last Name" name="last_name" />
                <br/>
                <TextField label="Email" name="email" />
                <br/>
                <TextField label="Password" name="password" />
                <br/>    
                <TextField label="Phone #" name="phone" />
                <Button type='Submit' variant="contained" color="primary">
                  Register
                </Button>
              </form>
            </div>
          </div>
        );
      }
    }

    export default Register;