The Hello World program with JSON

Now that we have a basic understanding of JSON, let us work on our Hello World program. This is shown in the screenshot that follows:

The preceding program will alert World onto the screen when it is invoked from a browser. Let us pay close attention to the script between the <script> tags.

In the first step, we are creating a JavaScript variable and initializing the variable with a JavaScript object. Similar to how we retrieve data from a JavaScript object, we use the key-value pair to retrieve the value. Simply put, JSON is a collection of key and value pairs, where every key is a reference to the memory location where the value is stored on the computer. Now let us take a step back and analyze why we need JSON, if all we are doing is assigning JavaScript objects that are readily available. The answer is, JSON is a different format altogether, unlike JavaScript, which is a language.

Note

JSON keys and values have to be enclosed in double quotes, if either...