During my work on the javascript Qt quiz, I had to decide how to store quiz questions. I have chosen the external json file for that purpose. This post describes this solution.

1. Write json content with the use of json parser to avoid typos. Parsers like http://json.parser.online.fr/ will help you to painfully create even the longest json files — you will see error immediately when you break the syntax.
2. The valid json can look like this:

    {
        "quiz": 
        [
            {
                "question": "Question 1",
                "a": "Answer a",
                "b": "Answer b",
                "c": "Answer c",
                "correct": "a"
            },
            {
                "question": "Question 2",
                "a": "Answer a",
                "b": "Answer b",
                "c": "Answer c",
                "correct": "b"
            },
            {
                "question": "Question 3",
                "a": "Answer a",
                "b": "Answer b",
                "c": "Answer c",
                "correct": "c"
            }
        ]
    }
   

3. Save json in the same folder as your js script. I named my file questions.json.
4. Load the json data with $.getJSON. Following example is complete script that loads the questions from json to allQuestions array.

       var allQuestions = new Array();
       
       $(function(){
           $.getJSON('questions.json',function(data){
               allQuestions = data.quiz;
               console.log('json loaded successfully');
           }).error(function(){
               console.log('error: json not loaded');
           });
       });
   

5. Now your json data is available in allQuestions array and you can access it, for example:

   var currentQuestion = allQuestions[0].question;
   var answerA         = allQuestions[0].a; 
   /* and so on*/
   

This solution can be developed further with encoding and decoding json.