Wisdom jobs Mean Stack Interview Questions and answers have been framed specially to get you prepared for the most frequently asked questions in many job interviews. Here we have provided Tips and Tricks for cracking Mean Stack interview Questions. These Mean Stack Interview questions and answers are useful for Beginner, Advanced Experienced programmers and job seekers of different experience levels. It's a good idea to go through Mean Stack Interview Questions. All the best in your job search.
Question 1. What’s The Mean Stack?
Answer :
The term MEAN stack refers to a collection of JavaScript-based technologies used to develop web applications. MEAN is an acronym for MongoDB, ExpressJS, AngularJS, and Node.js. From client to server to database, MEAN is full stack JavaScript.
Answer :
Express is one the most prevalent and generally utilized web systems in Node.js advancement zone. Express is a negligible web server based on Node.js that gives all the basic usefulness required for conveying web applications to the program and cell phones. ExpressJS enables you to deal with Routes, Server, and I/O stuff effortlessly.
Question 3. What Are The Features Of Node.js?
Answer :
Node.js is a single-threaded but highly scalable system that utilizes JavaScript as its scripting language. It uses asynchronous, event-driven I/O instead of separate processes or threads. It is able to achieve high output via single-threaded event loop and non-blocking I/O.
Question 4. Why Is Consistent Style Important And What Tools Can Be Used To Assure It?
Answer :
Consistent style helps team members modify projects easily without having to get used to a new style every time. Tools that can help include Standard and ESLint.
Question 5. What Is The Difference Between Angular.js And Node.js?
Answer :
Angular.JS is a web application development framework while Node.js is a runtime system.
Answer :
Mongoose is an Object Document Mapper (ODM). This means that Mongoose allows you to define objects with a strongly-typed schema that is mapped to a MongoDB document.
Question 7. What Are The Key Features Of Node.js?
Answer :
Question 8. Explain Repl In Node.js?
Answer :
The REPL stands for “Read Eval Print Loop”. It is a simple program that accepts the commands, evaluates them, and finally prints the results. REPL provides an environment similar to that of Unix/Linux shell or a window console, in which we can enter the command and the system, in turn, responds with the output.
REPL performs the following tasks:
Question 9. What Is The Difference Between Node.js, Ajax, And Jquery?
Answer :
The one common trait between Node.js, AJAX, and jQuery is that all of them are the advanced implementation of JavaScript. However, they serve completely different purposes.
Node.Js – It is a server-side platform for developing client-server applications. For example, if we’re to build an online employee management system, then we won’t do it using client-side JS. But the Node.js can certainly do it as it runs on a server similar to Apache, Django not in a browser.
AJAX (Aka Asynchronous Javascript And XML) – It is a client-side scripting technique, primarily designed for rendering the contents of a page without refreshing it. There are a no. of large companies utilizing AJAX such as Facebook and Stack Overflow to display dynamic content.
JQuery –It is a famous JavaScript module which complements AJAX, DOM traversal, looping and so on. This library provides many useful functions to help in JavaScript development. However, it’s not mandatory to use it but as it also manages cross-browser compatibility, so can help you produce highly maintainable web applications.
Question 10. What’s The Difference Between Operational And Programmer Errors?
Answer :
Question 11. What’s A Test Pyramid? How Might You Actualize It When Discussing Http Apis?
Answer :
A test pyramid portrays that when works test cases there ought to be significantly more low-level unit tests than abnormal state end-to-end tests.
When discussing HTTP APIs, it might come down to this:
Question 12. Explain Callback In Node.js?
Answer :
A callback work is called toward the culmination of a given errand. This enables other code to be keep running meanwhile and keeps any blocking. Being an offbeat stage, Node.js intensely depends on callback. All APIs of Node is composed to help callbacks.
Question 13. What Does Event-driven Programming Mean?
Answer :
In PC programming, occasion driven writing computer programs is a programming worldview in which the stream of the program is controlled by occasions like messages from different projects or strings. It is an application engineering method separated into two segments.
They are:
1) Event Selection
2) Event Handling
Question 14. Is Node.js Entirely Based On A Single-thread?
Answer :
Question 15. Explain Routing In Express.js?
Answer :
Routing is a mechanism used by frameworks to decide how a URL/endpoint is responded/handled by the server. Express provides an excellent way to handle applications routing.
Below is basic code to handle routing in Express:
var express = require('express')
var app = express()
respond with "hello world" when a GET request is made to the homepage
app.get('/', function (req, res) {
res.send('hello world')
});
Question 16. How To Install Express?
Answer :
Run below command to install express
npm install express --save
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