JSON Interview Questions

In JSON

• all property names are surrounded by double quotes.
• values are restricted to simple data: no function calls, variables, comments, or computations.

JSON is used for communication between javascript and serverside technologies.

Example Usage:

    var obj={"website":"Onlineinterviewquestions"};
    JSON.stringify(obj); // '{"website":"Onlineinterviewquestions"}'

• object literals
• Object.create
• constructors

• It is faster and lighter than XML as on the wire data format
• XML data is typeless while JSON objects are typed
• JSON types: Number, Array, Boolean, String
• XML data are all string
• Data is readily available as JSON object is in your JavaScript
• Fetching values is as simple as reading from an object property in your JavaScript code

• JSON: JSON is a simple data format used for communication medium between different systems
• JSONP: It is a methodology for using that format with cross-domain ajax requests while not being affected by same origin policy issue.

JSON-RPC-Java is a Java implementation of the JSON-RPC protocol.Below is list of some of its features

• Dynamically call server-side Java methods from JavaScript DHTML web applications. No Page reloading.
• Asynchronous communications.
• Transparently maps Java objects to JavaScript objects.
• Lightweight protocol similar to XML-RPC although much faster.
• Leverages J2EE security model with session specific exporting of objects.
• Supports Internet Explorer, Mozilla, Firefox, Safari, Opera, and Konqueror.

• Numbers: Integer, float or Double
• String: string of Unicode characters, must be rapped into double quotes “”
• Boolean: True or false
• Array: ordered list of 0 or more values
• Objects : An unordered collection key/ value pairs
• Null: An Empty value

Read Latest Jquery interview questions

let json = JSON.stringify(value[, replacer, space])

• Function properties (methods).
• Symbolic properties.
• Properties that store undefined.

var exjson = {'key':'value'};
delete exjson['key'];