JSON MCQs – Performance and Security

Performance and security are critical considerations when working with JSON in modern applications. Ensuring JSON data is optimized for transmission, storage, and processing can significantly impact an application’s efficiency. Security is equally vital to protect JSON data from vulnerabilities like injection attacks and unauthorized access.

Understanding the best practices and tools for managing JSON performance and security prepares developers for real-world challenges and boosts confidence during interviews. The following MCQs will help you enhance your knowledge of these essential topics.

1.) What is a common vulnerability associated with parsing untrusted JSON?

A) JSON Injection
B) JSON Brute Force
C) JSON Flooding
D) JSON Parsing Loops

Answer: Option A

Explanation: JSON injection occurs when untrusted data is inserted into JSON structures without proper validation, leading to security risks.

2.) Which tool can be used to measure JSON parsing performance in JavaScript?

A) JSONLint
B) JSON Formatter
C) Chrome DevTools
D) JSON Schema Validator

Answer: Option C

Explanation: Chrome DevTools can profile JavaScript code, including JSON parsing performance.

3.) Which of the following ensures JSON data is safe from injection attacks?

A) Minification
B) Input validation and sanitization
C) Using only numeric data
D) Removing all keys from JSON

Answer: Option B

Explanation: Input validation and sanitization ensure that malicious inputs are not processed in JSON data.

4.) Why should large JSON files be paginated in APIs?

A) To increase readability
B) To reduce client-side processing time
C) To improve network performance and reduce latency
D) To avoid key duplication

Answer: Option C

Explanation: Pagination breaks large datasets into smaller chunks, improving network performance and reducing latency.

5.) What is the purpose of using JSON Web Tokens (JWT)?

A) To replace JSON
B) To validate and secure data transmission
C) To beautify JSON
D) To convert JSON into binary format

Answer: Option B

Explanation: JSON Web Tokens (JWT) securely transmit information between parties as a JSON object.

6.) Which of these techniques can prevent excessive JSON data exposure in APIs?

A) Enabling strict validation in APIs
B) Compressing JSON
C) Using JSON.stringify()
D) Avoiding nested JSON structures

Answer: Option A

Explanation: Strict validation ensures only required fields are exposed in JSON responses, preventing data leakage.

7.) How can large nested JSON objects impact performance?

A) They improve network speed
B) They reduce API latency
C) They make JSON more secure
D) They slow down parsing and increase memory usage

Answer: Option D

Explanation: Large nested JSON objects can increase parsing time and memory usage, impacting performance.

8.) Which attack can occur when JSON data is excessively large and causes resource exhaustion?

A) Denial of Service (DoS)
B) Cross-Site Scripting (XSS)
C) SQL Injection
D) Remote Code Execution

Answer: Option A

Explanation: Sending excessively large JSON payloads can lead to Denial of Service (DoS) attacks by exhausting server resources.

9.) Which HTTP header is critical for securing JSON responses?

A) Content-Type
B) Access-Control-Allow-Origin
C) Accept-Encoding
D) X-Content-Type-Options

Answer: Option B

Explanation: The Access-Control-Allow-Origin header ensures JSON data is only accessible from allowed domains, preventing unauthorized access.

10.) What is one method to detect changes in JSON data?

A) Hashing the JSON content
B) Beautifying the JSON
C) Removing whitespace from JSON
D) Using nested structures

Answer: Option A

Explanation: Hashing the JSON content allows quick detection of any changes in the data.

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