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// send a message from the js to the python socketio
// in here we are sending the text that is in the inputBox
function runBackup(){
    input = document.getElementById('beginBackupBtn').value;
    var socket = io.connect('http://127.0.0.1:5000');
    socket.on('connect', function(){
        socket.send(input);
    });
    };

from flask_socketio import SocketIO, emit, send

app = Flask(__name__)
app.config['SECRET_KEY'] = 'mysecret'
socketio = SocketIO(app)

# getting the message that is sent from the js
@socketio.on('backup')
def handleMessage(msg):
    print('Message: ' + msg)
    send

<!--  Here is the import that should be in the headr for having the socket enabled in the js -->

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.2.0/socket.io.js"></script>