MEAN Stack Interview Questions and Answers
- What’s the MEAN Stack?
- Define Node.Js?
- When Node.js shouldn’t be used?
For spreading applications, node.js can be used. However, it’s one rib framework. Therefore, in cases where the system needs a long interval, we should not use it. If the server does some calculation, it will not be able to method the other requests at that time. Therefore, once there is a method that requires less dedicated C.P.U. time, Node.js is the best option.
If an application needs a long processing time, then node.js should be used. The explanation for this is, a single-threaded node is organized. Therefore, if a single application needs any long-running calculations in the background, it will not be able to process any further requests.
- What is DATA Modeling?
In the Mongoose and MongoDB context, data modeling determines what data can be in a database, and what data must be in a document. You might want to be able to save the first name, last name, email address, and telephone number while saving user information. But you only need an email address and a first name, and the email address must be unique. This information is defined as the basis for the data model in a schema.
- Why should we use Nodejs?
For what reason is Node.js so famous? Most of the web applications used a stateless request-and-response mechanism before the introduction of Node.js. To make the work of the developers rougher, they must always be sure that the correct code is written in the place when users work with the system so that the status of the web session is maintained.
But this issue has been resolved with the release of Node.js as users can now work in real-time and have 2-way communication with the server, i.e. anyone, whether the client or server, can start the communication.
- Explain callback in Node.js?
In node.js, the callback function is used to address multiple server requests. Like, if you have a large file that takes time for a server to read and do not want a server to read that big file, the callback is used when other requests are addressed. Call back allows the server to first handle the pending request and to call up a function after the request has been completed.
For example, if we have a file read function, Node.js automatically returns the control to the execution environment after it starts reading the file so that the next instruction can be executed. When the read operation of the file is complete, the callback function is called and the file’s content is passed as its argument. This feature makes Node.js highly scalable; with it, a large number of queries are processed without waiting for any feature to return the expected result.
- Explain the purpose of the ExpressJS package?
Express.js is a framework built on top of Node.js that makes it easier for server-side applications to manage data flow between server and routes. The lightweight and flexible framework offers a wide variety of functions necessary for the development of web and mobile applications. Express.js is developed on the Node.js middleware module called connect. The connection module also uses HTTP to communicate with Node.js. It makes it easy to integrate with Express.js if you work with any connect-based middleware modules.
- Explain the usage of a buffer class in Node.js?
- Why we use mean stack?
- Define Event Emitter of Node.js
You can build and manage customized events with the event module present at Node. Js. In this context, it should be noted that the event module contains the game emitter class, which can be used for handling and raising personalized events. Furthermore, you should be aware that when an event emitter detects an error, it will emit an error case. On the other side, it sends a sample with the name of the new user if a new user is added. Also, it sends a demonstration by remote user’s name when the current user is disabled.
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