Track JavaScript errors with Google Analytics

track_ajax_errors.js

// jQuery AJAX errors handler
$(document).ajaxError(function (event, request, settings) {
    ga(
        'send',
        'event',
        'jQuery Ajax Error',
        settings.url,
        JSON.stringify({
            result: event.result,
            status: request.status,
            statusText: request.statusText,
            crossDomain: settings.crossDomain,
            dataType: settings.dataType
        }),
        0,
        true
    );
});

track_jquery_errors.js

// jQuery errors handler
jQuery.error = function (message) {
    ga(
        'send',
        'event',
        'jQuery Error',
        message,
        navigator.userAgent,
        0,
        true
    );
}

track_vanilla_errors.js

// Pure JavaScript errors handler
window.addEventListener('error', function (err) {
    var lineAndColumnInfo = err.colno ? ' line:' + err.lineno +', column:'+ err.colno : ' line:' + err.lineno;
    ga(
        'send',
        'event',
        'JavaScript Error',
        err.message,
        err.filename + lineAndColumnInfo + ' -> ' +  navigator.userAgent,
        0,
        true
    );
});