MEAN Study Guide 2026
Everything you need to pass the MEAN exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 MEAN Exam Format at a Glance
📚 MEAN Topics to Study (21)
✍️ Sample MEAN Questions & Answers
1. What is returned by the subsequent expression? round(-20.51) =
The expression Math.round(-20.51) returns the value -21. The Math.round() function in JavaScript is used to round a number to the nearest whole number. When applied to -20.51, it rounds the number to the nearest integer value. Since -20.51 is closer to -21 than to -20, the result is -21.
2. Which MongoDB write concern value ensures acknowledgment from a majority of replica set members?
Write concern { w: 'majority' } ensures the primary and a majority of secondaries have confirmed the write before acknowledging success.
3. What is CSRF (Cross-Site Request Forgery) and how is it mitigated in Express?
CSRF attacks submit unauthorized requests using the victim's credentials; CSRF tokens embedded in forms or SameSite cookie attribute prevent cross-origin request forgery.
4. Which MongoDB feature allows you to enforce a schema on a collection?
MongoDB's built-in schema validation using $jsonSchema lets you define required fields, types, and constraints that documents must satisfy.
5. In Node.js _________ is the APIs of NOde.JS
In Node.js, asynchronous programming is a fundamental aspect of the platform, and there are several APIs available to facilitate asynchronous operations. These APIs allow you to perform I/O operations, handle events, and execute asynchronous tasks efficiently.
6. What is Angular's Change Detection strategy `OnPush` used for?
ChangeDetectionStrategy.OnPush tells Angular to skip change detection for a component unless its @Input references change, an event occurs, or an Observable emits.