Coding Cheatsheets - Learn to Code

Integrating Kafka with Node.js Apache Kafka is a popular open-source distributed event streaming platform that uses publish & subscribe mechanism to stream the records(data). Kafka Terminologies Distributed system: Distributed system is a computing environment where various software components located on different machines (over multiple locations). All components coordinate together to get stuff done as one unit.   Kafka Broker: Brokers are cluster of multiple servers. Message of each topic are split among the various brokers. Brokers handle all requests from clients to write and read events. A Kafka cluster is simply a collection of one or more Kafka brokers. Topics: A topic is a stream of "related" messages. Its unique throughout application. Kafka producers write messages to topics. Producer: Producer publishes data on the topics. A producer sends a message to a broker and the broker receives and stores messages. Consumers: Consumers read data from topics. A consu...

Here are simple steps to create real time notification using NodeJs, Socket.io and Mysql Socket.IO enables real-time bidirectional event-based communication.It has two parts: a client-side library that runs in the browser, and a server-side library for node.js. Install Socket.IO npm install --save socket.io I hope you have install express and mysql. This are basic few code inside server file. var express = require( 'express' ); var app = express(); app.use( express.static( __dirname + '/public') ); var mysql = require('mysql'); var server = require( 'http' ).Server( app ); var io = require( 'socket.io' )( server ); server.listen( 3000, function(){   console.log( 'listening on *:3000' ); } ); app.get('/', function(req, res) {    res.sendFile(__dirname + '/index.html'); }); The require('socket.io')(http) creates a new socket.io instance attached to the http server. Now make mysql conn...

How to Implement CRUD in Node.js With MySQL In this post, we are going to create a simple CRUD application in Node.js with MySQL as the database. We are using EJS as the template engine. Before get started with this tutorial: You need to have Node installed. Read my previous post for Node.js installation. Step 1: Create index.js as main file and package.json file package.json { "name": "curdnode", "version": "1.0.0", "description": "Create simple curd example in nodejs", "main": "index.js", "scripts": { "start": "node index.js", "test": "echo \"Error: no test specified\" && exit 1" }, "author": "techsudhir", "license": "ISC" } index.js console.log('Welcome You'); Now open up your command line and run : npm start Output: Welcome You Stop the c...

NodeJs Entry level Tutorial Node.js is an open-source, cross-platform JavaScript runtime environment for developing a diverse variety of tools and applications. It is a server-side platform built on Google Chrome's JavaScript Engine Follow Basic steps to run your first example Step1: Download Nodejs and install it. Step2: After installation Check NodeJs working or not a) Open Windows Command Prompt b) Execute the Command node -v. It print a version number Example: C:\Users\Sudhir>node -v Output: v6.9.2 c) Execute the Command npm -v . It print NPM’s version number Example: C:\Users\Sudhir>npm -v Output: 3.10.9 Step3: Type npm init and press enter Step4: It will ask for file name, version and description etc Step5: It will create a package.json file { "name": "nodetest", "version": "1.0.0", "description": "Hello test", "main": "index.js", "scripts": { ...