Error: The TVJS Framework encountered a JSON Parse issue due to an unexpected EOF

I am currently developing a TVML application specifically for Apple TV. However, when I attempt to execute this code to send a request to a remote server, I encounter the following error: SyntaxError: JSON Parse error: Unexpected EOF. My goal is to run this code from the application.js file and populate the initial view of the application. Any suggestions or assistance would be greatly appreciated.

    loadData("https:/xxx.xxx.net")

    function loadData(url) {
      var xhr;
      var jsonData;
      xhr = new XMLHttpRequest();
      xhr.responseType = "json";
      xhr.onreadystatechange = function() {
        if (xhr.status == 200) {
        jsonData = JSON.parse(xhr.responseText);
        console.log(jsonData);
        };
      };

      xhr.open("GET", url, true);
      xhr.send();
      if (jsonData != undefined) { return jsonData }
    };

Interestingly, other devices such as Roku utilize the same API without any issues.

{
    "playlists": [
        {
            "id": 8,
            "title": "test",
            "description": "new playlist test",
            "cover_url": "http://598-1446309178.png"
        },
        {
            "id": 9,
            "title": "test1",
            "description": "lives",
            "cover_url": "http://754-1446309324.jpg"
        },
        {
            "id": 10,
            "title": "test2",
            "description": "video games",
            "cover_url": "http://6173-1446310649.jpg"
        },
        {
            "id": 11,
            "title": "test4",
            "description": "little",
            "cover_url": "http://dd6-1446312075.jpg"
        }
    ]
}

Answer №1

If you encounter issues with your app, consider utilizing Safari for debugging purposes. After launching your app, navigate to "Develop / Simulator / {your app}". While your code segment appears fine, it is advisable to verify the content of xhr.responseText as it may be empty. Another problem lies in the asynchronous request being triggered by using "true" in the following line:

xhr.open("GET", url, true);

Make sure to establish a callback function and incorporate it into your code. I prefer employing an error-first callback approach.

function loadData(url, callback) {
      var xhr;
      var jsonData;
      xhr = new XMLHttpRequest();
      xhr.responseType = "json";
      xhr.onreadystatechange = function() {
        if (xhr.status == 200) {
        try{
            jsonData = JSON.parse(xhr.responseText);
        } catch(e) {
            return callback('json parsing error');
        }
        callback(null, jsonData);
        console.log(jsonData);
        };
      };

      xhr.open("GET", url, true);
      xhr.send();
    };

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