You can use the following sample code, it opens a connection to localhost server listening port 5414.
When connects to server, sends the message "Message from react".

import React, { Component } from 'react';



export class sgcWebSockets extends Component {

    static displayName = sgcWebSockets.name;



    constructor(props) {

        super(props);

        this.ws = WebSocket

        this.websocketOpen = this.websocketOpen.bind(this);

    }



    websocketOpen() {



        this.ws = new WebSocket('ws://localhost:5414')



        this.ws.onopen = () => {

            // connected

            this.ws.send('Message from react')

        }

        this.ws.onmessage = evt => {

            // listen to data sent from the websocket server

            const message = JSON.parse(evt.data)

        }



        this.ws.onclose = () => {

            // disconnected

        }

    }



    render() {

        return (

            <div>

                <h1>sgcWebSockets</h1>

                <button className="btn btn-primary" onClick={this.websocketOpen}>Connect</button>

            </div>

        );

    }

}

Kind regards,
Sergio