OpenJS Node.js Application Developer (JSNAD)

Question 1

What is the difference between Promises and callbacks in Node.js?

Promises provide a cleaner syntax for handling async operations and support chaining; callbacks are the older pattern There is no difference; they are interchangeable Callbacks are newer and more efficient than Promises Promises can only handle synchronous operations

Correct Answer:

Promises provide a cleaner syntax for handling async operations and support chaining; callbacks are the older pattern

Question 2

What does 'async/await' provide in Node.js?

Syntactic sugar over Promises that makes asynchronous code look and behave like synchronous code A way to make synchronous code run asynchronously automatically A method to block the event loop until an operation completes A replacement for the event loop entirely

Correct Answer:

Syntactic sugar over Promises that makes asynchronous code look and behave like synchronous code

Question 3

How should unhandled Promise rejections be handled in a production Node.js application?

By adding a global 'unhandledRejection' event handler and logging the error By ignoring them since Node.js handles them automatically By wrapping every line of code in try-catch blocks By disabling Promises entirely in production

Correct Answer:

By adding a global 'unhandledRejection' event handler and logging the error

Question 4

What is the 'error-first callback' pattern in Node.js?

A convention where callbacks receive an error object as the first argument, null if no error occurred A pattern where errors are always thrown as exceptions A method of logging errors to a file before callbacks execute A pattern where the first callback in a chain handles all errors

Correct Answer:

A convention where callbacks receive an error object as the first argument, null if no error occurred

Question 5

What is the purpose of 'try...catch' with async/await?

To catch errors thrown by awaited Promises in a synchronous-looking style To try different API endpoints until one works To cache the results of async operations To prevent the event loop from processing errors

Correct Answer:

To catch errors thrown by awaited Promises in a synchronous-looking style

Exam overview

About this Exam

Prepare with the OpenJS Node.js Application Developer (JSNAD) practice quiz. This question bank includes 30 questions covering node, express, difference, async, and professionals. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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OpenJS Node.js Application Developer (JSNAD)

This practice set contains 30 questions from the matching question bank and focuses on node, express, difference, async, and professionals. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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OpenJS Node.js Application Developer (JSNAD)

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