OMFYS Technologies Interview Questions and Answers

Middleware in web development acts as a bridge between different components of a software application, allowing them to communicate and interact with each other.

• Middleware is software that connects different software applications or components.

• It helps in handling communication between different systems or components.

• Middleware can provide services such as authentication, logging, and caching.

• Examples of middleware inc...read more

Code to start a simple Web server in JavaScript

• Use Node.js to create a simple web server

• Require the 'http' module

• Use the createServer method to create a server instance

• Listen on a specific port for incoming requests

var, let, and const are all used for variable declaration in JavaScript, but they have different scopes and mutability.

• var has function scope and can be redeclared and reassigned

• let has block scope and can be reassigned but not redeclared

• const has block scope and cannot be reassigned or redeclared

To connect to MongoDB using Javascript, you can use the official MongoDB Node.js driver.

• Install the MongoDB Node.js driver using npm: npm install mongodb

• Require the MongoDB Node.js driver in your Javascript file: const MongoClient = require('mongodb').MongoClient

• Connect to MongoDB using MongoClient.connect() method

• Specify the MongoDB connection URL and database name in the connect() method

• Access the MongoDB database an...read more

Async and Await are keywords used in JavaScript to handle asynchronous operations in a synchronous way.

• Async is used to declare a function as asynchronous, which means it will always return a promise.

• Await is used to pause the execution of a function until a promise is settled (resolved or rejected).

• Async functions can contain one or more await expressions to wait for promises to be resolved.

• Async functions always retu...read more