Get json data by url in sketch plugin

sketch-app-plugin-json.js

function get(queryURL) {
    var request = NSMutableURLRequest.new();
    [request setHTTPMethod:@"GET"];
    [request setURL:[NSURL URLWithString:queryURL]];

    var error = NSError.new();
    var responseCode = null;

    var oResponseData = [NSURLConnection sendSynchronousRequest:request returningResponse:responseCode error:error];

    var dataString = [[NSString alloc] initWithData:oResponseData encoding:NSUTF8StringEncoding];

    return dataString;
}