For http://moves-export.herokuapp.com/ when you have too many days. Run it in your console

export.js

function save() {
    var textToWrite = out;
    var textFileAsBlob = new Blob([textToWrite], {
        type: 'text/json'
    });
    var fileNameToSaveAs = "moves-export.json";

    var downloadLink = document.getElementById("download");
    downloadLink.download = fileNameToSaveAs;
    downloadLink.innerHTML = "";

    if (window.webkitURL != null) {
        // Chrome allows the link to be clicked
        // without actually adding it to the DOM.
        downloadLink.href = window.webkitURL.createObjectURL(textFileAsBlob);
    } else {
        // Firefox requires the link to be added to the DOM
        // before it can be clicked.
        downloadLink.href = window.URL.createObjectURL(textFileAsBlob);
        downloadLink.onclick = destroyClickedElement;
        downloadLink.style.display = "none";
        document.body.appendChild(downloadLink);
    }

    downloadLink.click();
}

var i = $('#date').val();
var out = '';
var firstday = new Date(i.slice(0, 4), i.slice(4, 6) - 1, i.slice(6, 8));
var today = new Date();

// Calculate all days to export

var difference = Math.abs(today.getTime() - firstday.getTime());
var totaldays = Math.ceil(difference / (1000 * 3600 * 24));

console.log("Total days to export: " + totaldays);

out += '{"export":['; // Open JSON object

// Loop trough each date and get a response

day = firstday;

var i = 0;

function fetch_data() {
    if (i < totaldays) {
        y = day.getFullYear().toString();

        m = day.getMonth();
        m = m + 1;
        if (m < 10) {
            m = '0' + m.toString();
        } else {
            m = m.toString();
        }

        d = day.getUTCDate();
        if (d < 10) {
            d = '0' + d.toString();
        } else {
            d = d.toString();
        }
        export_day = y + m + d;
        // Do a AJAX request to get the data of that day.
        var posting = $.post('/data', {
            date: export_day,
            access_token: '44e5BNVJ72oGQkv2aEzEEMTlo58tx9o40NqYWPsB10_Tr0qt84_duheZDRr30fyU'
        });

        // Add the response to a filed
        posting.done(function(data) {
            out += JSON.stringify(data['data'][0]);
            if (i != totaldays - 1 || i != 0) { // First and last trailing comma removed to produce valid JSON.
                out += ',';
            }

        });

        console.log((totaldays - 1) + ' ' + i);

        // Add another day
        day = new Date(day.getTime() + (24 * 60 * 60 * 1000));

        // Continue the loop in 2s
        setTimeout(fetch_data, 2000);
        i++;

    } else { // When the loop is done, end object
        out += ']}';
        alert('Done exporting!');
        save();
    }
}
setTimeout(fetch_data, 0);