JSON in Programming

Question 1 of 20

Which JavaScript method is used to convert a JavaScript object into a JSON string?

Choose 1 answer

A. JSON.parse()

B. JSON.stringify()

C. JSON.toString()

D. JSON.serialize()

Question 2 of 20

What is the output of the following code? const obj = {name: 'John', age: 30}; console.log(JSON.stringify(obj));

Choose 1 answer

A. {name: 'John', age: 30}

B. "{name: 'John', age: 30}"

C. "{\"name\":\"John\",\"age\":30}"

D. {\"name\":\"John\",\"age\":30}

Question 3 of 20

Which of the following will throw a syntax error when passed to JSON.parse()?

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A. "{ \"name\": \"John\" }"

B. "{ name: 'John' }"

C. "[1, 2, 3]"

D. "\"Hello\""

Question 4 of 20

What will happen if you try to parse an invalid JSON string using JSON.parse()?

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A. It returns undefined

B. It throws a SyntaxError

C. It converts the string to an object with a 'null' value

D. It returns null

Question 5 of 20

True or False: JSON.stringify can handle circular references in JavaScript objects.

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A. True

B. False

Question 6 of 20

Which JavaScript method is used to convert a JSON string into a JavaScript object?

Choose 1 answer

A. JSON.parse()

B. JSON.stringify()

C. JSON.convert()

D. JSON.deserialize()

Question 7 of 20

What is the purpose of the 'replacer' function in JSON.stringify?

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A. It adds new properties to the JSON object

B. It controls which properties should be included in the JSON string

C. It modifies the structure of the JSON object

D. It handles error cases during serialization

Question 8 of 20

How do you catch errors when parsing invalid JSON in JavaScript?

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A. By using a try-catch block

B. By using JSON.safeParse()

C. By setting an error handler in JSON.parse()

D. By checking for null values before parsing

Question 9 of 20

True or False: JSON data is always deserialized into a dictionary-like structure in Python.

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A. True

B. False

Question 10 of 20

Which Python method is used to convert a Python dictionary to a JSON string?

Choose 1 answer

A. json.dumps()

B. json.loads()

C. json.parse()

D. json.stringify()

Question 11 of 20

In Python, which of the following functions is used to deserialize JSON data from a file?

Choose 1 answer

A. json.dump()

B. json.loads()

C. json.load()

D. json.read()

Question 12 of 20

What would be the output of json.dumps({'name': 'Alice', 'age': 30}, indent=2) in Python?

Choose 1 answer

A. A JSON string with no indents

B. A JSON string with 2 spaces indent for each level

C. A minified JSON string

D. A JSON string formatted as a list

Question 13 of 20

Which of the following statements is true regarding JSON in Java?

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A. Java has built-in support for JSON parsing

B. External libraries such as Jackson or GSON are required for JSON processing

C. JavaScript must be used to handle JSON in Java

D. JSON is not supported in Java

Question 14 of 20

In PHP, which function is used to decode a JSON string?

Choose 1 answer

A. json_decode()

B. json_encode()

C. json_parse()

D. json_to_array()

Question 15 of 20

What is the primary reason JSON is used for data interchange in many programming languages?

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A. It is a lightweight data format with human-readable syntax

B. JSON supports binary data

C. JSON has native support in all languages

D. JSON can only be used for frontend web development

Question 16 of 20

True or False: In JavaScript, JSON.parse() can accept a 'reviver' function to customize object creation.

Choose 1 answer

A. True

B. False

Question 17 of 20

Which Python function is used to load a JSON string into a Python object?

Choose 1 answer

A. json.loads()

B. json.dumps()

C. json.parse()

D. json.open()

Question 18 of 20

In Java, which class is commonly used with Jackson for deserializing JSON into Java objects?

Choose 1 answer

A. ObjectMapper

B. JSONObject

C. Gson

D. JSONSerializer

Question 19 of 20

How would you handle invalid JSON data in Python when using json.loads()?

Choose 1 answer

A. Wrap the call in a try-except block

B. Use the 'safe' parameter in json.loads()

C. Use json.safe_loads() instead

D. Invalid JSON automatically gets ignored

Question 20 of 20

What would be the output of this PHP code? $data = json_encode(["name" => "John", "age" => 30]); echo $data;

Choose 1 answer

A. {'name': 'John', 'age': 30}

B. {"name": "John", "age": 30}

C. ["name" => "John", "age" => 30]

D. {name: John, age: 30}

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