JSON MCQs – APIs and JSON

APIs and JSON are integral to modern web development, enabling efficient data exchange between systems. JSON serves as the backbone for API communication, powering web applications, mobile apps, and microservices. These MCQs on APIs and JSON will help you prepare for technical interviews, equipping you with the knowledge to solve real-world problems and succeed in coding assessments.

1.) What does the term API stand for?

A) Application Programming Interface
B) Application Process Integration
C) Automated Programming Integration
D) Advanced Processing Interface

Answer: Option A

Explanation: API stands for Application Programming Interface, which allows communication between software applications.

2.) Which HTTP method is commonly used to fetch JSON data from an API?

A) POST
B) PUT
C) GET
D) DELETE

Answer: Option C

Explanation: The GET method is used to retrieve data from a server, including JSON responses.

3.) What does the Content-Type header specify in an API request?

A) The size of the request body
B) The format of the data being sent or expected
C) The HTTP method to be used
D) The status of the response

Answer: Option B

Explanation: The Content-Type header defines the data format, such as application/json, for requests and responses.

4.) Which of the following methods parses a JSON response in JavaScript?

A) JSON.stringify()
B) JSON.decode()
C) JSON.parse()
D) JSON.fetch()

Answer: Option C

Explanation: The JSON.parse() method converts a JSON string into a JavaScript object.

5.) What is the purpose of the fetch() method in JavaScript?

A) To send emails
B) To make HTTP requests to APIs
C) To parse JSON strings
D) To encrypt data

Answer: Option B

Explanation: The fetch() method is used in JavaScript to make HTTP requests, often to interact with APIs.

6.) What is the default HTTP method for the fetch() function?

A) POST
B) PATCH
C) PUT
D) GET

Answer: Option D

Explanation: By default, the fetch() function uses the HTTP GET method.

7.) Which of the following status codes indicates a successful API request?

A) 404
B) 500
C) 200
D) 403

Answer: Option C

Explanation: The HTTP status code 200 indicates that the API request was successful.

8.) What does a 404 status code signify in an API response?

A) Unauthorized access
B) Resource not found
C) Internal server error
D) Bad request

Answer: Option B

Explanation: A 404 status code indicates that the requested resource could not be found on the server.

9.) Which JavaScript method can convert an object into a JSON string for an API request?

A) JSON.encode()
B) JSON.parse()
C) JSON.stringify()
D) JSON.serialize()

Answer: Option C

Explanation: The JSON.stringify() method converts JavaScript objects to JSON strings for API transmission.

10.) What is a common format for API error responses?

A) JSON object
B) Plain text
C) Plain text
D) CSV file

Answer: Option A

Explanation: API error responses are typically formatted as JSON objects for consistency and easy parsing.

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