script

<script>
        TESTER = document.getElementById('tester');
        // https://flask-stub.herokuapp.com/get_data
        // var server_url = 'http://127.0.0.1:5000/get_data'
        var server_url = 'https://flask-stub.herokuapp.com/get_data';

        let data;

        fetch(server_url)
            .then(function (response) {
                return response.json();
            })
            .then(function (data) {
                console.log(data)
                let x = [];
                let y = [];
                for (let key in data) {
                    x.push(key);
                    y.push(data[key]);
                    console.log(key);
                }

                Plotly.newPlot( TESTER, [{
                    x: x,
                    y: y
                }], {
                    margin: { t: 0 } } );
                    });
    </script>