Converting Custom Data Arrays to JSON using JavaScript

My goal was to create a utility function that can convert custom data (the type of data Sencha Touch stores use) into JSON format. I've made progress, but the function fails when dealing with complex data from the Twitter API, although it works fine with simpler data types.

Custom Data

var items = [];
for (var i = 0; i < 10; i++) {
   var item = {};

   var data = {};
   data.prop1 = "123456789";
   data.prop2 = "Some Name";
   data.prop3 = "Some Date and Time";

   item.data = data;

   items.push(item);
}

The above data can be iterated through in a loop and converted to JSON using the following function.

function toJSON(items) {
    var jsonString = "[";

    for (var i = 0; i < items.length; i++) {
        var item = items[i];

        jsonString += "{";

        for (var propertyName in item.data) {
            jsonString += '"' + propertyName + '":' + '"' + item.data[propertyName] + '",';
        }

        if (jsonString.substr(jsonString.length - 1, 1) === ",") {
            jsonString = jsonString.substr(0, jsonString.length - 1);
        }

        jsonString += "},";
    }

    if (jsonString.substr(jsonString.length - 1, 1) === ",") {
        jsonString = jsonString.substr(0, jsonString.length - 1);
    }

    jsonString += "]";

    return jsonString;
}

The main question is whether my encoding process is correct?

You can visit these fiddles for a hands-on experience: http://jsfiddle.net/WUMTF/ and

Answer №1

Have you considered utilizing the native JSON.stringify() method, or the versions provided by popular JavaScript / AJAX libraries? These options are typically more reliable, tested, secure, and efficient. In fact, many library versions simply leverage the browser's native methods when available.

While your current toJSON implementation may work for simple test data, it may struggle with more complex data structures due to various limitations. For instance, it assumes that the top level is always an array and that each element in the array only has properties one level deep. Take a look at https://github.com/douglascrockford/JSON-js/blob/master/json.js, Douglas Crockford's JSON implementation. This comprehensive approach covers all essential aspects of a valid JSON implementation. Recreating this level of functionality from scratch may prove challenging and time-consuming.

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