Operational JSON Interview Questions & Answers:

1. What is MIME type for JSON?

The MIME type for JSON text is "application/json"

2. What is JSON file type?

The file type for JSON files is ".json"

3. Explain Syntax of JSON using JavaScript?

Because JSON uses JavaScript syntax, no extra software is needed to work with JSON within JavaScript.

With JavaScript you can create an array of objects and assign data to it like this:

JSON CODE
{
"studeents": [
{ "firstName":"Ali" , "lastName":"Khan" },
{ "firstName":"John" , "lastName":"Sena" },
{ "firstName":"Kate" , "lastName":"Winslet" }
]
}

4. Explain JSON Arrays?

JSON arrays are written inside square brackets.

An array can contain multiple objects:
JSON Arrays
{
"studeents": [
{ "firstName":"Ali" , "lastName":"Khan" },
{ "firstName":"John" , "lastName":"Sena" },
{ "firstName":"Kate" , "lastName":"Winslet" }
]
}

5. Explain JSON Objects?

JSON objects are written inside curly brackets,

Objects can contain multiple name/values pairs.

6. Explain JSON Values?

JSON values can be:

► A number (integer or floating point)
► A string (in double quotes)
► A Boolean (true or false)
► An array (in square brackets)
► An object (in curly brackets)
► null

7. Explain JSON Syntax Rules?

JSON syntax is a subset of the JavaScript object notation syntax.

► Data is in name/value pairs
► Data is separated by comma
► Curly brackets holds objects
► Square brackets holds arrays

8. Which browsers provide native JSON support?

Native JSON support is included in newer browsers and in the newest ECMAScript (JavaScript) standard.

Web Browsers Support:

► Firefox (Mozilla) 3.5
► Internet Explorer 8
► Chrome
► Opera 10
► Safari 4

9. What is JSON Parser?

The eval() function can compile and execute any JavaScript. This represents a potential security problem.

It is safer to use a JSON parser to convert a JSON text to a JavaScript object. A JSON parser will recognize only JSON text and will not compile scripts.

10. How to convert JSON Text to a JavaScript Object?

One of the most common use of JSON is to fetch JSON data from a web server (as a file or as an HttpRequest), convert the JSON data to a JavaScript object, and then it uses the data in a web page.