JSON interview questions for freshers/JSON Interview Questions and Answers for Freshers & Experienced

What is Polyfill?

The JSON object is not supported in older browsers. We can work around this by inserting a piece of code at the beginning of your scripts, allowing use of JSON object in implementations which do not natively support it (like Internet Explorer 6) is called Polyfill.

What is serialization in Javascript?

The serialize() method creates a URL encoded text string by serializing form values. You can select one or more form elements (like input and/or text area), or the form element itself. The serialized values can be used in the URL query string when making an AJAX request.

What does JSON parse do?

The JSON.parse() method parses a JSON string, constructing the JavaScript value or object described by the string. An optional reviver function can be provided to perform a transformation on the resulting object before it is returned.

How to Validate json in jQuery?

function isValidJson(jsonData) { try { $.parseJSON(jsonData); return true; } catch (e) { return false; } } var json = '{"name":"PHP Tutorial","Description":"Web technology experts notes"}' isValidJson(json);

How to Validate json in javascript?

function isValidJson(jsonData) { try { JSON.parse(jsonData); return true; } catch (e) { return false; } } var json = '{"name":"PHP Tutorial","Description":"Web technology experts notes"}' isValidJson(json);

How to get PHP array from json Object?

$object='{"name":"PHP Tutorial","Description":"Expert in web technology"}'; $array = json_decode($object);

How to create json from php array?

$array = array('name'=>'PHP Tutorial','Description'=>'Web technology experts notes');

echo json_encode($array);

Which browser provides native JSON support?

All modern browsers support native JSON encoding/decoding (Internet Explorer 8+, Firefox 3.1+, Safari 4+, and Chrome 3+). Basically, JSON.parse(str) will parse the JSON string in str and return an object, and JSON.stringify(obj) will return the JSON representation of the object obj.

Which functions are used for encoding and decoding JSON in PHP?

For encoding, json_encode() function is used. This function takes PHP value like array as input and returns JSON representation of it. For decoding, json_decode() function is used. This function takes JSON string as input and returns associative array.

What is a JSON parser?

JSON parser to parse JSON object and MAINTAIN comments. By using JSON, when receiving data from a web server, the data should be always in a string format. We use JSON.parse() to parse the data and it becomes a JavaScript object.

The JSON.parse() method parses a JSON string, constructing the JavaScript value or object described by the string. An optional reviver function can be provided to perform a transformation on the resulting object before it is returned.

What is JSON RPA Java?

JSON-RPC is a simple remote procedure call protocol similar to XML-RPC although it uses the lightweight JSON format instead of XML (so it is much faster).

What is Number in JSON?

JSON Numbers – A number is very much like a C or Java number, except that the octal and hexadecimal formats are not used. A number is a sequence of decimal digits with no superfluous leading zero.

It may have a preceding minus sign (U+002D). It may have a fractional part prefixed by a decimal point (U+002E). It may have an exponent, prefixed by e (U+0065) or E (U+0045) and optionally + (U+002B) or – (U+002D). The digits are the code points U+0030 through U+0039.

Numeric values that cannot be represented as sequences of digits (such as Infinity and NaN) are not permitted.

How to delete an index from JSON Obj?

Deleting an Element from JSON Obj
var exjson = {'key':'value'};
delete exjson['key'];

How do you decode a JSON string?

Use JSON.parse method to decode a JSON string into a Javascript object.

How to convert an Object into JSON? What is the full syntax of JSON.stringify?

JSON.stringify method is used to convert an Javascript Object into JSON.
Syntax:
let json = JSON.stringify(value[, replacer, space])

How to convert an Object into JSON? What is the full syntax of JSON.stringify?

JSON.stringify method is used to convert an Javascript Object into JSON.
Syntax:
let json = JSON.stringify(value[, replacer, space])

Explain the syntax rules for JSON?

This is the most popular JSON Interview Questions asked in an interview. In JSON, data is being arranged in Key value pair. In this left side represents the key and right side represents the value and these both things are separated by the colon. The data is mainly separated with help of using a comma. In JSON, curly braces define the objects and arrays are defined inside the JSON object by using the square brackets.

Explain Newtonsoft in JSON?

Newtonsoft is referred to as the framework which is mainly used in the .net framework for performing the operations with JSON. It is also called as Json.net. There are a lot of features using Newtonsoft like it enables the user to parse, create, modify and query the JSON using its internal framework. It is simple and easy to use. It enables the user to serialize and de serialize any object with JSON serializer. It is faster than other serializers. It supports the conversion from XML to JSON and vice versa. Its syntax is simple and provides an easier way to query the JSON. It is a free and open source. To convert the data into JSON structure, a creation of an object is required to store data and once the object has been created then we can store the variables and keys in an object. After storing data in the object then we can serialize that data that is how serialization is done and de-serialization is reverse of it.

What is the rule for writing JSON?

JSON is the collection of key and value pair separated by the comma.
Key and value are separated by the colon (:).
Square brackets are used to store JSON array.
Curly brackets are used to hold JSON objects.

What is JSON-RPC? List some Features of JSON-RPC-Java

JSON-RPC: JSON-RPC is a simple remote procedure call protocol similar to XML-RPC although it uses the lightweight JSON format instead of XML.
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.

What is the extension of the JSON file?

A JSON file has an extension of “.json”. Being in a text-based format, a JSON file can be viewed or edited using any text editor like notepad or notepad++.

Which functions are used for encoding and decoding JSON in PHP?

For encoding, json_encode() function is used. This function takes PHP value like array as input and returns JSON representation of it. For decoding, json_decode() function is used. This function takes JSON string as input and returns associative array.

What is BSON?

BSON is a computer data interchange format. The name "BSON" is based on the term JSON and stands for "Binary JSON". It is a binary form for representing simple or complex data structures including associative arrays (also known as name-value pairs), integer indexed arrays, and a suite of fundamental scalar types. BSON originated in 2009 at MongoDB.

Mention what is JSONP?

JSONP stands for JSON with padding. It is a method used to bypass the cross-domain policies in web browsers. In other words, JSONP is the simple way to deal with browser restrictions when sending JSON responses from different domains from the client.

Mention what is the MIME type of JSON?

MIME type for JSON text is “application/json”

Mention what are the drawbacks of JSON?

Drawbacks of json are

* It does not contain type definition
* It lacks some sort of DTD

Explain how you can convert a string into a JSON Array?

To convert a string into a JSON array, you need to create a JSONObject object for each of your objects, and add those to your JSON array.

List some benefits of JSON over XML?

* 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

Is JSON markup language?

JSON is like XML in that it is used to structure data in a text format and is commonly used to exchange data over the Internet. JSON is not a markup language. JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write.

What is the default value of a constructor’s prototype?

A plain, empty object that derives from Object.prototype is the default value of a constructor’s prototype

What is the difference between XML and JSON?

The fundamental difference, which no other answer seems to have mentioned, is that XML is a markup language (as it actually says in its name), whereas JSON is a way of representing objects (as also noted in its name). This is what makes markup languages so useful for representing documents.

What is JSON data?

JSON, or JavaScript Object Notation, is a minimal, readable format for structuring data. In JSON data is nothing but a information. It is used primarily to transmit data between a server and web application, as an alternative to XML.

Why do we use JSON?

The JSON format is often used for serializing and transmitting structured data over a network connection. It is used primarily to transmit data between a server and web application, serving as an alternative to XML.

Mention what is the function used for encoding JSON in PHP?

For encoding JSON in PHP, json_encode () function is used. This function returns the JSON representation of a value on success or false on failure.

What are different ways to create objects?

You can create Object by

* object literals
* Object.create
* constructors

Mention what is the role of JSON.stringify?

JSON.stringify() converts an object into a JSON text and saves that JSON text in a string.

Mention what are the data types supported by JSON?

Data types supported by JSON includes

* Number
* String
* Boolean
* Array
* Object
* Null

What does $.parseJSON() do ?

$.parseJSON() takes a well-formed JSON string and returns the resulting JavaScript value.

Who is known as the father of JSON?

Douglas Crockford is known as the father of JSON. Douglas Crockford was the person who originally defined the JSON format back in 2000.

What does Object.create do?

Object.create creates a new object with the specified prototype object and properties.

Is JSON is a language?

JSON is a data format. It could be classified as a language, but not a programming language. Its relationship to JavaScript is that it shares its syntax (more or less) with a subset of JavaScript literals.

List types Natively supported by JSON?

JSON supports Objects, Arrays, Primitives (strings, numbers, boolean values (true/false), null) data types.

What programming languages supported by JSON?

JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others.

Mention which function is used to convert a JSON text into an object?

To convert JSON text into an object “eval” function is used.

Mention what is JSON-RPC and JSON Parser?

JSON RPC: It is a simple remote procedure call protocol same as XML-RPC although it uses the lightweight JSON format instead of XML
JSON Parser: JSON parser is used to parse the JSON data into objects to use its value. It can be parsed by javaScript, PHP and jQuery

Why must one use JSON over XML?

* 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

Mention what is the rule for JSON syntax rules? Give an example of JSON object?

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

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

How to convert Javascript objects into JSON?

JSON.stringify(value); is used to convert Javascript objects into JSON.
Example Usage:

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

Explain how to transform JSON text to a JavaScript object?

One of the common use of JSON is to collect JSON data from a web server as a file or HTTP request, and convert the JSON data to a JavaScript, ant then it avails the data in a web page.

what is JSON objects?

An object can be defined as an unordered set of name/value pairs. An object in JSON starts with {left brace} and finish or ends with {right brace}. Every name is followed by: (colon) and the name/value pairs are parted by, (comma).

what is JSON?

JSON is a simple data exchange format. JSON means JavaScript Object Notation; it is language and platform independent.

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