Olete.in – MCQs, Mock Tests & Government Job Prep | JSON JSON Multiple choice Questions

JSON name/value pair is written as

1. name’ : ‘value’
2. name = ‘value
3. name = “value”
4. “name” : “value”

✅ Correct Answer: 4

JSON strings have to be in

1. single quote
2. double quote
3. single quote or double quote
4. None of These

✅ Correct Answer: 2

In the below notation, Employee is of type { “Employee”: [ “Amy”, “Bob”, “John” ] }

1. Not a valid JSON string
2. Array
3. Class
4. Object

✅ Correct Answer: 2

Which of the following is not a JSON type?

1. Object
2. date
3. Array
4. string

✅ Correct Answer: 2

Which of these is correct about the JSON standard?

1. It is an open standard
2. It is privately developed
3. It requires a license to use
4.

✅ Correct Answer: 1

What is the file extension of JSON?

1. .jn
2. .js
3. .jsn
4. json

✅ Correct Answer: 4

In modern websites what is the common usage for JSON?

1. To store information remotely.
2. To send and receive bits of data.
3. To store information locally.
4. None of these

✅ Correct Answer: 2

Which of the following code will return a valid JSON object?

1. JSON.parse(‘({“FirstName”: “John”, “LastName”:”Doe”})’);
2. JSON.parse(“{‘FirstName’: ‘John’, ‘LastName’:’Doe’}”);
3. JSON.parse(“({‘FirstName’: ‘John’, ‘LastName’:’Doe’})”);
4. JSON.parse(‘{“FirstName”: “John”, “LastName”:”Doe”}’);

✅ Correct Answer: 4

Which of these is proper a JSON array?

1. { “letters” : [ “a”, “b”, “c”; ] }
2. { ‘letters’ : {“a”, “b”, “c” } }
3. { “letters” : [ a, b, c ] }
4. { “letters” : [ “a”, “b”, “c” ] }

✅ Correct Answer: 4

In the below notation, Employee is of type { “Employee”: { “Name”: “Amy”, “Age”: 25 } }

1. Object
2. Array
3. Class
4. Not a valid JSON string

✅ Correct Answer: 1

Which answer represents the following order of TYPES? Object, String, Boolean, Number

1. “{ }”, “a string”, “false”, “0”
2. [ ], 0, “true”, “0”
3. { }, “0”, false, 0
4. { }, hello, “false”, “0”

✅ Correct Answer: 3

In this example, what is the TYPE of employee? { “employee” : { “type” : “Director”, “functions” : [‘sales’, ‘marketing’] } }

1. String .
2. Director
3. type
4. Object

✅ Correct Answer: 4

Given this JSON example: { “Employee”: { “Name”: “Amy”, “Age”: 25 } }; What is the type of Employee.Age ?

1. Number
2. Object
3. Array
4. String

✅ Correct Answer: 1

Which of these is a benefit JSON has over XML?

1. JSON is more forgiving of poor formatting
2. JSON has less markup requirements and therefore is lighter than XML
3. JSON can be written poorly and still be parsed
4. JSON does not need to be stored in a file to be sent remotely

✅ Correct Answer: 2

What does JSON stand for?

1. JavaScript Object Nomenclature
2. JavaScript Objective Notation
3. JavaScript Object Notation
4. JavaScript Orientated Nomenclature

✅ Correct Answer: 3

JSON elements are separated by

1. semi-colon
2. line break
3. comma
4. white space

✅ Correct Answer: 3

What keywords are reserved in JSON and cannot be used as keys?

1. Value
2. Object
3. There are none
4. Key

✅ Correct Answer: 3

Which of the following is a valid JSON string?

1. { “meals” : { “breakfast” , “lunch” , “dinner” } }
2. { “meals” : [ “breakfast” , “lunch” , “dinner” ] }
3. [ “meals” : { “breakfast” , “lunch” , “dinner” } ]
4. [ {“meals” : { “breakfast” , “lunch” , “dinner” } } ]

✅ Correct Answer: 2

Which of the following code will throw an error?

1. JSON.parse(null);
2. JSON.parse(‘{}’);
3. JSON.parse(undefined);
4. JSON.parse(‘[]’);

✅ Correct Answer: 3

Which statement about the toJSON method is true?

1. It customizes JSON stringification behavior
2. It allows an object to determine its own JSON representation
3. All three statements are true
4. It is internally called by JSON.stringify()

✅ Correct Answer: 3

Which of these data interchange formats has seen a decline in usage in favor of JSON?

1. ASCII
2. Plain-text
3. SQL
4. XML

✅ Correct Answer: 4

True or false? A disadvantage of JSON is that it requires the use of JavaScript.

1. False, JSON is language independent.
2. False, JavaScript must be available although it is not necessary to use.
3. True, though all browsers have JavaScript enabled.
4. True, though JavaScript is readily available in today’s browsers.

✅ Correct Answer: 1

Which is true about JSON namespacing?

1. JSON namespaces can be accessed immediately after receiving data.
2. JSON namespaces can be accessed after parsing data.
3. JSON doesn’t have namespaces. Though every object is inherently a namespace.
4. None of These

✅ Correct Answer: 3

What kind of format is JSON, and what does the acronym mean?

1. A lightweight data-encoding framework. Java Omnipresent Notation.
2. A lightweight data-interchange format. JavaScript Object Notation.
3. A lightweight data-interchange format. Java Objective Notion.
4. A lightweight database framework. JavaScript Object Notation.

✅ Correct Answer: 2

Can you use a double quote inside a JSON string?

1. Yes, if you use the ascii code.
2. Yes, you can use it without any special treatment
3. Yes, if it is escaped like ( ” )
4. No, you should use single quotes

✅ Correct Answer: 3

In this example, what is the TYPE of employee.functions? { “employee” : { “type” : “Director”, “functions” : [‘sales’, ‘marketing’] } }

1. String
2. Object
3. Array
4. Sales, Marketing

✅ Correct Answer: 3

Which statement about the reviver parameter in JSON.parse() is true?

1. All three statements are true
2. Used to reform generic objects into instances of pseudo-classes
3. A function that will be called for every key and value at every level of the final result
4. Each value will be replaced by the result of the reviver function

✅ Correct Answer: 1

Which statement about the reviver parameter in JSON.parse() is true?

1. All three statements are true
2. Used to reform generic objects into instances of pseudo-classes
3. A function that will be called for every key and value at every level of the final result
4. All of the above

✅ Correct Answer: 1

What function will convert a JavaScript object to a JSON string?

1. JSON.text()
2. JSON.serialize()
3. JSON.toString()
4. JSON.stringify()

✅ Correct Answer: 4

In this example, what would the VALUE of employee.functions[1] be? { “employee” : { “type” : “Director”, “functions” : [‘sales’, ‘marketing’] }

1. null
2. undefined
3. marketing
4. sales

✅ Correct Answer: 3

What is the MIME type of JSON?

1. application/x-json
2. text/json
3. application/json
4. application/javascript

✅ Correct Answer: 3

In this example, what is the VALUE of employee.type? { “employee” : { “type” : “Director”, “functions” : [‘sales’, ‘marketing’] }

1. String
2. Object
3. Director
4. None of These

✅ Correct Answer: 3

In this example, what would the TYPE of employee.hireDate be? { “employee” : { “type” : “Director”, “functions” : [‘sales’, ‘marketing’], “hireDate” : “March 8, 2011” } }

1. March 8, 2011
2. String
3. Date
4. Number

✅ Correct Answer: 2

What is JSONP meant to mitigate?

1. Size constraints of JSON
2. Cross-domain communication
3. Future proofing JSON as JavaScript changes.
4. None of these

✅ Correct Answer: 2

Which of these is supported as a JSON Value type?

1. Infiniti
2. Null
3. Undefined
4. NaN

✅ Correct Answer: 2

When coding a string object in JSON, what must separate the string and the value?

1. A space
2. A semicolon
3. A comma
4. A colon

✅ Correct Answer: 4

Does JSON support Unicode characters? A.

1. No, JSON has no support for any kind of character encoding.
2. No, JSON only has support for UTF-8 characters
3. Yes, JSON has support for Unicode characters. Allowing for almost any information in any human language
4. Yes, only when stored as the key in a ( key : value ) pair.

✅ Correct Answer: 3

What is the value of obj in the following code? var obj = JSON.parse(‘{“fruit”: “Apple”}’, function(k, v) { if (v == “Apple”) return “Orange” else return v; });

1. { “fruit” : “Apple”}
2. { “fruit” : “Orange”}
3. {“Orange”}
4. {“Apple”}

✅ Correct Answer: 2

In what situation would you want to use XML over JSON?

1. When JSON is not offered.
2. When you need to use tags to structure your content
3. You need message validation or you’re using XSLT.
4. Never, JSON is worlds better.

✅ Correct Answer: 3

What is a JSONStringer used for?

1. It is used to quickly create JSON text.
2. It quickly converts JSON to Java strings.
3. It is used to create number strings in JSON.
4. It is used to create JSON ordered pairs.

✅ Correct Answer: 1

Which of the following control characters cannot be used when writing a JSON string without escaping?

1. ; or :
2. “ or
3. < or >
4. / or {

✅ Correct Answer: 2

What is the value of json in the following code? var days = {}; days[‘Monday’] = true; days[‘Wednesday’] = true; days[‘Sunday’] = false; var json = JSON.stringify({x: days});

1. {“day”:{“Monday”:”true”,”Wednesday”:”true”,”Sunday”:”false”}}
2. {“x”:{“Monday”:true,”Wednesday”:true,”Sunday”:false}}
3. {“day”:{“Monday”:true,”Wednesday”:true,”Sunday”:false}}
4. {“x”:[“Monday”:true,”Wednesday”:true,”Sunday”:false]}

✅ Correct Answer: 2

How does JSON being “lightweight” translate into a benefit for the site visitors?

1. Faster transfer times over the internet
2. Parsing JSON is noticeably faster than parsing XML
3. Web apps have a smaller footprint
4. None of These

✅ Correct Answer: 1

What error does JSON.parse() throw when the string to parse is not valid JSON?

1. ReferenceError
2. EvalError
3. SyntaxError
4. TypeError

✅ Correct Answer: 3

What two structures is JSON built on?

1. A collection of name/value pairs, and an ordered list of values, or array.
2. A collection of object/item pairs, and an ordered list of pairs, or array.
3. A collection of name/value objects, and an ordered list of objects, or array.
4. A collection of native-value pairs, and an ordered list of arrays, or values.

✅ Correct Answer: 1

Which of the following is not a valid way to parse JSON string?

1. JSON.eval()
2. JSON.parse()
3. jQuery.parseJSON()
4. eval()

✅ Correct Answer: 1

Does whitespace matter in JSON?

1. No, it will be stripped out.
2. Yes, only within strings
3. Yes, only outside of strings
4. Yes, both inside and outside of strings

✅ Correct Answer: 2

What is the value of json in the following code? var cars = []; cars[0] = ‘Ford’; cars[1] = ‘Toyota’; cars[2] = ‘BMW’; var json = JSON.stringify({x: cars});

1. {“x”:[‘Ford’,’Toyota’,’BMW’]}
2. {“x”:{“Ford”,”Toyota”,”BMW”}}
3. {“x”:[“Ford”,”Toyota”,”BMW”]}
4. {“cars”:[“Ford”,”Toyota”,”BMW”]}

✅ Correct Answer: 3

What is the value of json in the following code? var obj = { fruit: ‘apple’, toJSON: function () { return ‘orange’; } }; var json = JSON.stringify({x: obj});

1. {“x”:”orange”}
2. {“fruit”:”apple”}
3. {“x”:”apple”}
4. {“fruit”:”orange”}

✅ Correct Answer: 1

What types of values can you have in JSON key:value pairs?

1. Strings, Arrays, and Primitives
2. Arrays, Primitives, and Objects stored as strings
3. Strings, Arrays, Primitives and Objects
4. Strings only

✅ Correct Answer: 3

What does JSONP stand for?

1. JSON Procedures
2. JSON Parsing
3. JSON with padding
4. JSON Programming

✅ Correct Answer: 3

Which of the following code will not throw an error?

1. JSON.parse(”);
2. JSON.parse(null);
3. JSON.parse();
4. JSON.parse({});

✅ Correct Answer: 2

How does JSON handle numeric values that cannot be represented by a sequence of digits (like Infiniti and Nan)?

1. They are stored as strings and then converted when parsed.
2. They are not permitted.
3. They are stored fine but it’s the parsers job to convert them to numeric values.
4. None of these

✅ Correct Answer: 2

Which of the following number formats are not used in JSON?

1. Octal and gate
2. Octal and binary
3. Binary and hexadecimal
4. Octal and hexadecimal

✅ Correct Answer: 4

What is used by the JSONObject and JSONArray constructors to parse JSON source strings?

1. JSONTokener
2. JSONParser
3. JParser
4. ParserJ

✅ Correct Answer: 1

Which statement about the space parameter in JSON.stringify() is false?

1. It controls spacing in the resulting JSON string
2. All three statements are false
3. It removes whitespace
4. It is an optional parameter

✅ Correct Answer: 3

JSON stands for ________________

1. Java Standard Output Network
2. JavaScript Object Notation
3. JavaScript Output Name
4. Java Source Open Network

✅ Correct Answer: 2

Which is correct format of writting JSON name/value pair

1. 'name : value'
2. name = 'value'
3. name = "value"
4. "name" : "value"

✅ Correct Answer: 4

Which of the following is not a type in JSON?

1. date
2. Object
3. Array
4. string

✅ Correct Answer: 1

Who is the Father of JSON ?

1. Douglas Crockford
2. Rasmus Lerdorf
3. Douglas Michel
4. Dennis Ritchie

✅ Correct Answer: 1

. The MIME type of JSON is -

1. application/json
2. application/x-json
3. application/javascript
4. text/json

✅ Correct Answer: 1

JSONP stands for -

1. JSON Parsing
2. JSON Procedures
3. JSON Programming
4. JSON with padding

✅ Correct Answer: 4

__________is not a valid way to parse JSON string.

1. JSON.parse()
2. JSON.eval()
3. jQuery.parseJSON()
4. None of the above

✅ Correct Answer: 2

Which of the following code will throw an error?

1. JSON.parse(‘{}’);
2. JSON.parse(null);
3. JSON.parse(undefined);
4. JSON.parse(‘[]’);

✅ Correct Answer: 3

JSON elements are separated by the -

1. line break
2. semi-colon
3. comma
4. white space

✅ Correct Answer: 3

Which of following statement is false about the space parameter in JSON.stringify() ?

1. It controls spacing in the resulting JSON string
2. It is an optional parameter
3. It removes whitespace
4. All are false

✅ Correct Answer: 3

What extension in used to save a JSON file?

1. .json .
2. .js .
3. javaN
4. on

✅ Correct Answer: 1

Can you use a double quote inside a JSON string?

1. No, you should use single quotes
2. Yes, if you use the ascii code.
3. Yes, if it is escaped like ( " )
4. Yes, you can use it without any special treatment

✅ Correct Answer: 3

. For What is a JSONStringer used for?

1. To converts JSON to Java strings
2. To quickly create JSON text
3. To quickly create JSON text
4. To quickly create JSON text

✅ Correct Answer: 4

What are two main structures compose JSON?

1. Arrays and Objects
2. Keys and values
3. Class and Objects
4. None of above

✅ Correct Answer: 2