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File system in nodeJS Introduction The fs module enables interacting with the file system in a way modelled on standard POSIX functions To use the promise-based APIs To use the callback and sync APIs All file system operations have synchronous, callback, and promise-based forms // Using ESM Module syntax: import…

DNS in nodeJS Introduction Domain Name System (DNS) The DNS module enables name resolution. For example, use it to look up IP addresses of hostnames Uses the DNS protocol for lookups dns.lookup() uses the operating system facilities to perform name resolution const dns = require('dns'); dns.lookup('domainname', (err, address, family) =>…

Cluster in nodeJS Introduction A single instance of Node.js runs in a single thread To take advantage of multi-core systems, the user will sometimes want to launch a cluster of Node.js processes to handle the load The cluster module allows easy creation of child processes that all share server ports…

Read Eval Print Loop (REPL) in nodeJS Introduction The repl module provides a Read-Eval-Print-Loop (REPL) implementation that is available both as a standalone program or includible in other applications The repl module exports the repl.REPLServer class Accept individual lines of user input Evaluate those according to a user-defined evaluation function,…

Sending mails in nodeJS The npm provides a pretty package to send the emails 1. Using nodemailer The Nodemailer module makes it easy to send emails from the nodejs application Install using the command, npm install nodemailer var nodemailer = require('nodemailer'); var transporter = nodemailer.createTransport({ service: 'gmail', auth: { user:…