[NEW] Secure Code in NodeJs JavaScript

Common Vulnerabilities and Their Prevention (40%)

Secure Coding Practices and Best Practices (40%)

Option B: Utilizing parameterized queries or prepared statements

Option C: Escaping all single quotes in the user input manually

Option D: Encoding the user input using Base64 before querying

Option E: Validating that the input only contains alphanumeric characters

Option F: Hashing the input data using SHA-256 before inserting it into the database

Correct Answer: Option B

Explanation:

Option B is correct because parameterized queries ensure that the database strictly treats user input as data rather than executable code, completely neutralizing SQL injection attacks,

Option C is incorrect because manual escaping is highly prone to human error and might miss specific database dialects' nuances,

Option D is incorrect because Base64 is merely encoding, not escaping, and the database will evaluate the decoded malicious payload if not handled right,

Option E is incorrect because restricting to alphanumeric characters breaks legitimate use cases like email addresses or names with hyphens,

Option F is incorrect because hashing is meant for passwords, not for general data storage or querying against standard text fields,

Question 2: When implementing Cross-Site Request Forgery (CSRF) prevention in an Express application, which combination of techniques provides the most robust defense?

Option B: Using GET requests for all state-changing operations

Option C: Implementing anti-CSRF tokens alongside SameSite cookie attributes

Option D: Disabling CORS (Cross-Origin Resource Sharing) entirely

Option E: Relying solely on the Origin header validation for all incoming requests

Option F: Encrypting the JWT payload and storing it in a standard unflagged cookie

Correct Answer: Option C

Explanation:

Option B is incorrect because GET requests should never be used for state-changing operations, and doing so makes CSRF exploitation trivial,

Option C is correct because combining a unique anti-CSRF token validated on the server with the SameSite attribute on cookies ensures that requests cannot be forged from unauthorized external origins,

Option D is incorrect because disabling CORS does not prevent CSRF, as traditional HTML form submissions bypass preflight CORS checks entirely,

Option E is incorrect because Origin headers are not always reliably sent by browsers due to certain proxies or strict privacy settings,

Option F is incorrect because standard unflagged cookies are automatically sent with cross-origin requests, leaving the application entirely susceptible to CSRF,

Question 3: What is a secure best practice for handling errors and logging in a production NodeJs environment?

Option B: Using standard console logging for all debugging and writing the output to a public file

Option C: Logging descriptive error details internally while returning generic error messages to the client

Option D: Silently ignoring non-fatal errors to keep the application running without interruption

Option E: Storing all database connection strings in the error logs for quick access during crashes

Option F: Disabling all logging in production to maximize application performance and save disk space

Correct Answer: Option C

Explanation:

Option B is incorrect because standard console logging can be synchronous and writing to a public file exposes sensitive operational data to unauthorized users,

Option C is correct because logging descriptive errors internally allows developers to properly debug issues, while sending generic messages to the client successfully prevents information leakage,

Option D is incorrect because silently ignoring errors leads to unpredictable application states and makes debugging practically impossible,

Option E is incorrect because logs should never contain sensitive credentials like database connection strings or API keys under any circumstances,

Option F is incorrect because disabling logs wholly prevents monitoring, auditing, and learn comptia a core 2 220 1102 os security troubleshooting when severe security incidents or application crashes occur,

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