43 JSON Interview Questions And Answers 2018

JSON Interview Questions And Answers 2018. Here Coding compiler sharing a list of JSON interview questions & answers for freshers and experienced. This list JSON questions will help you to crack your next JSON job interview. All the best for your future and happy learning.

JSON Interview Questions

  1. What does JSON stand for?
  2. What is JSON?
  3. What programming languages supported by JSON?
  4. Is JSON is a language?
  5. What are the properties of JSON?
  6. Why do we use JSON?
  7. What is JSON data?
  8. What is the difference between XML and JSON?
  9. Why JSON format is better than XML?
  10. Is JSON markup language?

JSON Interview Questions And Answers

JSON Interview Questions # 1) What does JSON stand for?

Answer) JSON stands for “JavaScript Object Notation”.

JSON Interview Questions # 2) What is JSON?

Answer) JSON is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language, Standard ECMA.

JSON Interview Questions # 3) What programming languages supported by JSON?

Answer) 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.

JSON Interview Questions # 4) Is JSON is a language?

Answer) 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.

JSON Interview Questions # 5) What are the properties of JSON?

Answer) These properties make JSON an ideal data-interchange language.

JSON is built on two structures:

A collection of name/value pairs. In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array.

An ordered list of values. In most languages, this is realized as an array, vector, list, or sequence.

These are universal data structures. Virtually all modern programming languages support them in one form or another. It makes sense that a data format that is interchangeable with programming languages also be based on these structures.

JSON Interview Questions For Freshers

JSON Interview Questions # 6) Why do we use JSON?

Answer) 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.

JSON Interview Questions # 7) What is JSON data?

Answer) 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.

JSON Interview Questions # 8) What is the difference between XML and JSON?

Answer) 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.

JSON Interview Questions # 9) Why JSON format is better than XML?

Answer) JSON and XML used different formats. When compared both JSON is easy to write and use it applications then XML. The XML format can also be determined by the XML DTD or XML Schema (XSL) and can be tested.

The JSON a data-exchange format which is getting more popular as the JavaScript applications possible format. Basically this is an object notation array. JSON has a very simple syntax so can be easily learned.

JSON Interview Questions # 10) Is JSON markup language?

Answer) 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.

Top JSON Interview Questions

11) What is JSON Text?

Answer) A JSON text is a sequence of tokens formed from Unicode code points that conforms to the JSON value grammar. The set of tokens includes six structural tokens, strings, numbers, and three literal name tokens.

The six structural tokens:
[ U+005B left square bracket
{ U+007B left curly bracket
] U+005D right square bracket
} U+007D right curly bracket
: U+003A colon
, U+002C comma

These are the three literal name tokens:
true U+0074 U+0072 U+0075 U+0065
false U+0066 U+0061 U+006C U+0073 U+0065
null U+006E U+0075 U+006C U+006C

Insignificant whitespace is allowed before or after any token. Whitespace is any sequence of one or more of the following code points: character tabulation (U+0009), line feed (U+000A), carriage return (U+000D), and space (U+0020). Whitespace is not allowed within any token, except that space is allowed in strings.

JSON Interview Questions # 12) What is JSON Value?

Answer) A JSON value can be an object, array, number, string, true, false, or null.

13) What is JSON Syntax?

A) JSON syntax is derived from JavaScript object notation syntax. Data is in name/value pairs. Data is separated by commas. Curly braces hold objects. Square brackets hold arrays.

JSON Interview Questions # 14) What is JSON Value?

Answer) In JSON, value holds some data. A value can be a string in double quotes, or a number, or true or false or null, or an object or an array. These structures can be nested.

Values in JSON must be one of the following data types:

  • a string
  • a number
  • an object (JSON object)
  • an array
  • a boolean
  • null

15) What is JSON Array?

Answer) An array structure is a pair of square bracket tokens surrounding zero or more values. An array is an ordered collection of values. An array begins with [ (left bracket) and ends with ] (right bracket). Values are separated by , (comma).

The values are separated by commas. The JSON syntax does not define any specific meaning to the ordering of the values. However, the JSON array structure is often used in situations where there is some semantics to the ordering.

Interview Quetions And Answers on JSON

JSON Interview Questions # 16) What is Number in JSON?

Answer) 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.

17) What is JSON String?

Answer) A string is a sequence of zero or more Unicode characters, wrapped in double quotes, using backslash escapes. A character is represented as a single character string. A string is very much like a C or Java string.

A string is a sequence of Unicode code points wrapped with quotation marks (U+0022). All code points may be placed within the quotation marks except for the code points that must be escaped: quotation mark (U+0022), reverse solidus (U+005C), and the control characters U+0000 to U+001F. There are two-character escape sequence representations of some characters.

\” represents the quotation mark character (U+0022).
\\ represents the reverse solidus character (U+005C).
\/ represents the solidus character (U+002F).
\b represents the backspace character (U+0008).
\f represents the form feed character (U+000C).
\n represents the line feed character (U+000A).
\r represents the carriage return character (U+000D).
\t represents the character tabulation character (U+0009).

JSON Interview Questions # 18) What is JSON object?

Answer) An object is an unordered set of name/value pairs. An object begins with { (left brace) and ends with } (right brace). Each name is followed by : (colon) and the name/value pairs are separated by , (comma).

19) What is JSON RPA Java?

Answer) 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).

JSON Interview Questions # 20) What is a JSON parser?

Answer) 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.

Advanced JSON Interview Questions

21) Which browser provides native JSON support?

Answer) 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.

JSON Interview Questions # 22) What is the difference between JSON parse and JSON Stringify?

Answer) JSON.stringify() is to create a JSON string out of an object/array. They are the inverse of each other. JSON.stringify() serializes a JS object into a JSON string, whereas JSON.parse() will deserialize a JSON string into a JS object.

23) What is the MIME type of JSON?

Answer) The MIME media type for JSON text is application/json . The default encoding is UTF-8.

JSON Interview Questions # 24) What is the use of JSON Stringify?

Answer) The JSON.stringify() method converts a JavaScript value to a JSON string, optionally replacing values if a replacer function is specified, or optionally including only the specified properties if a replacer array is specified.

25) What does JSON parse do?

Answer) 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.

JSON Interview Questions # 26) What is serialization in Javascript?

Answer) 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.

27) What is Polyfill?

Answer) 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.

JSON Interview Questions # 28) What is toJSON() method in JOSN?

Answer) The toJSON() method returns a string representation of the Date object.

29) What is JSONP?

Answer) JSONP stands for JSON with Padding. JSONP is a method for sending JSON data without worrying about cross-domain issues. JSONP does not use the XMLHttpRequest object. JSONP uses the <script> tag instead.

JSON Interview Questions # 30) What is the difference between JSON and JSONP?

Answer) JSONP is a simple way to overcome browser restrictions when sending JSON responses from different domains from the client. But the practical implementation of the approach involves subtle differences that are often not explained clearly. Here is a simple tutorial that shows JSON and JSONP side by side.

JSON Interview Questions For Experienced

31) What is serialization and deserialization in JSON?

Answer) JSON is a format that encodes objects in a string. Serialization means to convert an object into that string, and deserialization is its inverse operation. When transmitting data or storing them in a file, the data are required to be byte strings, but complex objects are seldom in this format.

JSON Interview Questions # 32) What is serialization of an object?

Answer) To serialize an object means to convert its state to a byte stream so that the byte stream can be reverted back into a copy of the object.

33) What is the use of JSON in Java?

Answer) The Java API for JSON Processing provides portable APIs to parse, generate, transform, and query JSON. JSON (JavaScript Object Notation) is a lightweight, text-based, language-independent data exchange format that is easy for humans and machines to read and write.

JSON Interview Questions # 34) Why do we use JSON in PHP?

Answer) A common use of JSON is to read data from a web server, and display the data in a web page. This chapter will teach you how to exchange JSON data between the client and a PHP server.

35) What is JSON Formatter?

Answer) The JSON Formatter & Validator helps debugging JSON data by formatting and validating JSON data so that it can easily be read by human beings.

JSON Interview Questions # 36) What is JSON Viewer?

Answer) JSON Viewer – Convert JSON Strings to a Friendly Readable Format.

37) What is JSON Validator?

Answer) The JSON Validator helps debugging JSON data by formatting and validating JSON data so that it can easily be read by human beings.

JSON Interview Questions # 38) Why do we use JSON in Android?

JSON stands for JavaScript Object Notation.It is an independent data exchange format and is the best alternative for XML.

Android provides four different classes to manipulate JSON data. These classes are JSONArray,JSONObject,JSONStringer and JSONTokenizer.

39) Why do we use JSON in Python?

Answer) Python programming language is used to encode and decode JSON objects.

Python encode() function encodes the Python object into a JSON string representation.

Python decode() function decodes a JSON-encoded string into a Python object.

JSON Interview Questions & Answers

JSON Interview Questions # 40) What is JSON in JavaScript?

Answer) JSON is derived from the JavaScript programming language, it is a natural choice to use as a data format in JavaScript. JSON, short for JavaScript Object Notation.

41) What is JSON Schema?

Answer) JSON Schema is a specification for JSON based format for defining the structure of JSON data.

JSON Interview Questions # 42) What are the advantages of JOSN?

Answer)

  • It is used while writing JavaScript based applications that includes browser extensions and websites.
  • JSON format is used for serializing and transmitting structured data over network connection.
  • It is primarily used to transmit data between a server and web applications.
  • Web services and APIs use JSON format to provide public data.
  • It can be used with modern programming languages.

43) Can you write an example code in JSON?

Answer) The following example shows how to use JSON to store information related to books based on their topic and edition.

{
"book": [
 
{
"id":"01",
"language": "Java",
"edition": "third",
"author": "Herbert Schildt"
},
 
{
"id":"07",
"language": "C++",
"edition": "second"
"author": "E.Balagurusamy"
}
]
}

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Advanced Reactjs Interview Questions For Experienced

Advanced Reactjs Interview Questions For Experienced 2018. If you are looking for React interview questions, then this blog post provides a list of 43 Real-time scenario based React.js interview questions. Explore below listed React questions and prepare for your next Reactjs job interview. All the best for your future and happy learning.

Reactjs Interview Questions

What is React.js? How is it different from other javascript frameworks?
Can you explain about the standard JavaScript toolchain, transpilation, JSX?
Explain lifecycle of a React component?
Have you used HTML while working with React.js?
How do you embed two components in one component?
How might React handle or restrict Props to certain types, or require certain Props to exist?
How React component lifecycle methods help in building interfaces?
How React Router and its techniques differ from more traditional JavaScript routers like Backbone’s Router?
How to apply validation on Props in ReactJS? Apply validation in previously developed example in above question?
How to set up routing in ReactJS. Explain with the help of step by step approach?
How to use Events in ReactJS? Give an example of using events?
How to use Forms in ReactJS? Give an example of using Forms in ReactJS by developing a User Registration Form?
How would you create Higher Order Components (HOCs) in React.js?
Please explain step by step approach on how to setup environment for ReactJS?
What are Components in ReactJS? Explain the Component Lifecycle with the help of a diagram explaining each component method in detail. Also, Give an example of both Stateless and Stateful components with source code?
What are pure functional Components?
What are react component lifecycle methods?

Advaned Reactjs Interview Questions

What are State and Props in ReactJS? What is the difference between the two? Give a proper example of using State and Props to elaborate the concept with complete source code?
What are stateless components in React.js?
What are the advantages and disadvantages of using React components?
What are the benefits of using React.js?
What is a router in React.js?
What is Flux concept in ReactJS? Explain various flux elements including Action, Dispatcher, Store and View. Give a simple practical example of installing and using Flux in an application?
What is Flux in React.js?
What is high-level component lifecycle in React.js?
What is JSX and how JSX can help applications in React.js?
What is low-level component lifecycle in React.js?
What is ReactJS-JSX? What are the advantages of using JSX? Explain basic code snippet of JSX with the help of a practical example?

Reactjs Interview Questions For Experienced

What is Redux and Flux? When do you use them?
What is shouldComponentUpdate and when is used in React.js?
What is the difference between an Element and a Component in React?
What is the difference between AngularJs Vs React.js?
What is the difference between Flux Vs MVC?
What is the difference between React Components extend, createClass and mixins, HOCs?
What is the difference between React Components in ES5 and ES6?
What is the difference between setState() and forceUpdate()?
What is the difference between various React Component lifecycle methods?
What is the significance of keys in React?
What is the significance of refs in React?
What is the Virtual DOM, and a pragmatic overview of how React renders it to the DOM in React.js?
What kind of tools might you use in the build steps to optimize the compiled output of the React code?
When would you use setState() and forceUpdate()?
Which feature can we use to cause a component to render only when its ID changes?

References: Codementor, Toptal, Webdevelopmenthelp websites.

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Advanced Javascript Interview Questions For Experienced

133 Advanced Javascript Interview Questions For Experienced. If you are preparing for javascript job interview, these real-time javascript interview questions will help freshers and experienced to crack the javascript job. Read Now.!

Javascript Interview Questions

Between JavaScript and an ASP script, which is faster?
Can you access Cookie using javascript?
Can you assign a anonymous function to a variable?
Can you pass a anonymous function as an argument to another function?
Define unescape() and escape() functions?
Describe the properties of an anonymous function in JavaScript?
Does JavaScript support automatic type conversion?
Enumerate the differences between Java and JavaScript?
Explain how can you submit a form using JavaScript?
Explain how to detect the operating system on the client machine?
Explain how to read and write a file using JavaScript?
Explain the difference between “==” and “===”?
Explain the for-in loop?
Explain the role of deferred scripts in JavaScript?
Explain the unshift() method ?
Explain the working of timers in JavaScript? Also elucidate the drawbacks of using the timer, if any?
Explain what is pop()method in JavaScript?
Explain window onload and onDocumentReady?
Give an example of closure?
How are DOM utilized in JavaScript?
How are event handlers utilized in JavaScript?
How are JavaScript and ECMA Script related?
How are object properties assigned?
How are object properties assigned?
How can a page be forced to load another page in JavaScript?
How can a particular frame be targeted, from a hyperlink, in JavaScript?
How can a value be appended to an array?

Advanced Javascript Interview Questions

How can JavaScript codes be hidden from old browsers that don’t support JavaScript?
How can the OS of the client machine be detected?
How can the style/class of an element be changed?
How can you convert the string of any base to integer in JavaScript?
How can you create an Array in JavaScript?
How can you create an Object in JavaScript?
How can you get the reference of a caller function inside a function?
How can you get the total number of arguments passed to a function?
How can you get the type of arguments passed to a function?
How can you read properties of an Object in JavaScript?
How generic objects can be created?
How many types of functions JavaScript supports?
How to create a Cookie using JavaScript?
How to define a anonymous function?
How to delete a Cookie using JavaScript?
How to find operating system in the client machine using JavaScript?
How to handle exceptions in JavaScript?
How to print a web page using javascript?
How to read a Cookie using JavaScript?
How to read elements of an array in JavaScript?
How to redirect a url using JavaScript?
How typeof operator works?

Scenario Based Javascript Interview Questions

How will you explain closures in JavaScript? When are they used?
Is it possible to break JavaScript Code into several lines?
Is JavaScript a case-sensitive language?
Is JavaScript case sensitive? Give an example?
Mention what is the disadvantage of using innerHTML in JavaScript?
Name some of the JavaScript features.
What are all the looping structures in JavaScript?
What are all the types of Pop up boxes available in JavaScript?
What are disadvantages of using JavaScript?
What are escape characters?
What are global variables? How are these variable declared and what are the problems associated with using them?
What are JavaScript Cookies?
What are JavaScript Data Types?
What are Screen objects?
What are the advantages of using JavaScript?
What are the decodeURI() and encodeURI()?
What are the different types of errors in JavaScript?
What are the two basic groups of dataypes in JavaScript?
What are the valid scopes of a variable in JavaScript?
What are the variable naming conventions in JavaScript?
What are the various functional components in JavaScript?
What are undeclared and undefined variables?
What boolean operators can be used in JavaScript?
What do mean by NULL in Javascript?
What does the following statement declares?
What is ‘this’ keyword in JavaScript?
What is === operator?

Real Time Javascript Interview Questions

What is a named function in JavaScript? How to define a named function?
What is a prompt box?
What is an undefined value in JavaScript?
What is arguments object in JavaScript?
What is break and continue statements?
What is callback?
What is called Variable typing in Javascript?
What is closure?
What is Date object in JavaScript?
What is JavaScript?
What is JavaScript?
What is namespacing in JavaScript and how is it used?
What is negative infinity?
What is Number object in JavaScript?
What is purpose of onError event handler in JavaScript?
What is the ‘Strict’ mode in JavaScript and how can it be enabled?
What is the data type of variables of in JavaScript?
What is the difference between an alert box and a confirmation box?
What is the difference between call() and apply()?
What is the difference between JavaScript and Jscript?
What is the difference between ViewState and SessionState?
What is the function of delete operator?

Essential Javascript Interview Questions

What is the method for reading and writing a file in JavaScript?
What is the purpose of ‘this’ operator in JavaScript?
What is the role of break and continue statements?
What is the use of blur function?
What is the use of isNaN function?
What is the use of Push method in JavaScript?
What is the use of type of operator?
What is the use of Void(0 )?
What is the way to get the status of a CheckBox?
What is unshift method in JavaScript?
What is variable typing?
What typeof returns for a null value?
Whether JavaScript has concept level scope?
Which built-in method adds one or more elements to the end of an array and returns the new length of the array?
Which built-in method calls a function for each element in the array?
Which built-in method combines the text of two strings and returns a new string?
Which built-in method removes the last element from an array and returns that element?
Which built-in method returns the calling string value converted to lower case?
Which built-in method returns the calling string value converted to upper case?
Which built-in method returns the character at the specified index?
Which built-in method returns the characters in a string beginning at the specified location?
Which built-in method returns the index within the calling String object of the first occurrence of the specified value?
Which built-in method returns the length of the string?
Which built-in method returns the string representation of the number’s value?

Latest Javascript Interview Questions

Which built-in method reverses the order of the elements of an array?
Which built-in method sorts the elements of an array?
Which company developed JavaScript?
Which keyword is used to print the text in the screen?
Which keywords are used to handle exceptions?
Which symbol is used for comments in Javascript?
Which type of variable among global and local, takes precedence over other if names are same?
Why it is not advised to use innerHTML in JavaScript?
Write about the errors shown in JavaScript?
Write the code for adding new elements dynamically?
Write the point of difference between web-garden and a web-farm?

Source: Guru99

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