Node Js Quizz

What is the primary role of the event loop in Node.js?

• Handling HTTP requests

• Managing asynchronous operations

• Synchronizing database queries

• Controlling the DOM in the browser

Which of the following is a characteristic of readable streams in Node.js?

• They are bidirectional.

• They are always in flowing mode.

• They emit 'finish' event when data is written.

• They cannot be piped.

In Express.js, what is the purpose of the next function in middleware?

• It terminates the middleware execution.

• It passes control to the next middleware in the stack.

• It triggers a route handler.

• It sends a response to the client.

Which keyword is used to import modules in CommonJS (Node.js) syntax?

• import

• use

• require

• include

In Node.js, what is the purpose of the 'domain' module?

• It handles errors in asynchronous operations.

• It manages the application's global state.

• It isolates error handling for specific parts of the application.

• It sets the default error handling behavior.

Scaling and Performance

• Distributing tasks to worker threads.

• Running multiple instances of the application on different servers.

• Optimizing the performance of individual functions.

• Managing database connections.

How can you mitigate common security vulnerabilities in a Node.js application?

• Regularly update Node.js modules.

• Disable error logging.

• Use weak passwords for authentication.

• Store sensitive information directly in the source code.

Which testing framework is commonly used for Node.js applications?

• Mocha

• Jest

• Jasmine

• All of the above

What is the purpose of JWT (JSON Web Tokens) in user authentication?

• Storing user passwords securely.

• Encoding user information in a compact format.

• Verifying the integrity of HTTP requests.

• Encrypting communication between the client and server.

Which protocol is commonly used with WebSockets in Node.js?

• HTTP

• TCP

• UDP

• SMTP