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Why Node.js? • Rapid innovation & delivery • Developer happiness • Attract & retain talent • Performance “Why Node.js is Becoming the Go-To Technology in the Enterprise” – nearform.com

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Why Node.js? productivity satisfaction performance lower costs Improved results year-over-year Node.js Foundation User Survey

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https://blog.platformatic.dev/nodejs-is-here-to-stay

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• Backend API for SPAs, Mobile apps, etc. • “Serverless” computing • Real-time, streaming • WebSockets, push notifications • Chat, IM, social media Node.js Use Cases

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More than just backend • Automation Scripts (DevOps) • CLI tools (compile with nexe) • Microservices • Internet of Things • Desktop Apps

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Slack Visual Studio Code Figma

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DevOps • Small footprint • Cross-platform • Event-driven • OSS tools • Containers

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Releases and Long-Term Support (LTS)

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Node.js v22 • V8 12.4 • Maglev Compiler • Native watch mode • Native WebSocket • Mascot

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Install Node.js https://nodejs.org

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Install Node.js with NVM Mac or Linux? Use nvm! https://github.com/nvm-sh/nvm Windows? Install Windows Subsytem for Linux (WSL)! > nvm install 20

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Install Node.js with NVM https://github.com/coreybutler/nvm-windows > nvm install 20

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What You Get > node –v v20.16.0 > npm –v 10.8.2

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> node –v v20.16.0 > npm –v 10.8.2 What You Get

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First Things First! > mkdir myproject > cd myproject > npm init This utility will walk you through creating a package.json file!!...

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Install Dependencies > npm install axios > npm install !--save-dev eslint > npm install -D eslint-config-reverentgeek

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const fs = require( "fs" ); !// Built-in Node.js module const express = require( "express" ); !// Module installed via npm const ApiService = require( "./app/ApiService" ); !// Local module const api = new ApiService( { port: 8888 } ); module-examples.js

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const fs = require( "fs" ); !// Built-in Node.js module const express = require( "express" ); !// Module installed via npm const ApiService = require( "./app/ApiService" ); !// Local module const api = new ApiService( { port: 8888 } ); module-examples.js

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const fs = require( "fs" ); !// Built-in Node.js module const express = require( "express" ); !// Module installed via npm const ApiService = require( "./app/ApiService" ); !// Local module const api = new ApiService( { port: 8888 } ); module-examples.js

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const fs = require( "fs" ); !// Built-in Node.js module const express = require( "express" ); !// Module installed via npm const ApiService = require( "./app/ApiService" ); !// Local module const api = new ApiService( { port: 8888 } ); module-examples.js

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const fs = require( "fs" ); !// Built-in Node.js module const express = require( "express" ); !// Module installed via npm const ApiService = require( "./app/ApiService" ); !// Local module const api = new ApiService( { port: 8888 } ); module-examples.js

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const ApiService = require( "./app/ApiService" ); const api = new ApiService( { port: 8888 } ); !// Traditional Node-style callback api.methodWithACallback( "bacon", 42, function( err, results ) { if ( err ) { !// Do something with the error console.log( err ); return; } !// Do stuff with results for ( let i = 0; i < results.length; i!++ ) { !// stuff!!... } } ); callback-example.js

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const ApiService = require( "./app/ApiService" ); const api = new ApiService( { port: 8888 } ); !// Traditional Node-style callback api.methodWithACallback( "bacon", 42, function( err, results ) { if ( err ) { !// Do something with the error console.log( err ); return; } !// Do stuff with results for ( let i = 0; i < results.length; i!++ ) { !// stuff!!... } } ); callback-example.js

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const ApiService = require( "./app/ApiService" ); const api = new ApiService( { port: 8888 } ); !// Traditional Node-style callback api.methodWithACallback( "bacon", 42, function( err, results ) { if ( err ) { !// Do something with the error console.log( err ); return; } !// Do stuff with results for ( let i = 0; i < results.length; i!++ ) { !// stuff!!... } } ); callback-example.js

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const ApiService = require( "./app/ApiService" ); const api = new ApiService( { port: 8888 } ); !// Promise-style callback api.methodReturningAPromise( "bacon", 42 ) .then( results !=> { for ( let i = 0; i < results.length; i!++ ) { !// stuff!!... } } ) .catch( err !=> { console.log( err ); } ); promise-example.js

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const ApiService = require( "./app/ApiService" ); const api = new ApiService( { port: 8888 } ); !// Promise-style callback api.methodReturningAPromise( "bacon", 42 ) .then( results !=> { for ( let i = 0; i < results.length; i!++ ) { !// stuff!!... } } ) .catch( err !=> { console.log( err ); } ); promise-example.js

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const ApiService = require( "./app/ApiService" ); const api = new ApiService( { port: 8888 } ); !// Promise-style callback api.methodReturningAPromise( "bacon", 42 ) .then( results !=> { for ( let i = 0; i < results.length; i!++ ) { !// stuff!!... } } ) .catch( err !=> { console.log( err ); } ); promise-example.js

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const ApiService = require( "./app/ApiService" ); const api = new ApiService( { port: 8888 } ); !// Promise-style callback api.methodReturningAPromise( "bacon", 42 ) .then( results !=> { for ( let i = 0; i < results.length; i!++ ) { !// stuff!!... } } ) .catch( err !=> { console.log( err ); } ); promise-example.js

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const ApiService = require( "./app/ApiService" ); const api = new ApiService( { port: 8888 } ); !// Async-await callback async function doTheThing() { try { const users = await api.asyncMethodReturningUsers(); const results = await api.methodReturningAPromise( "bacon", 42 ); for ( let i = 0; i < results.length; i!++ ) { !// stuff!!... } } catch( err ) { console.log( err ); } } doTheThing(); async-await-example.js

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const ApiService = require( "./app/ApiService" ); const api = new ApiService( { port: 8888 } ); !// Async-await callback async function doTheThing() { try { const users = await api.asyncMethodReturningUsers(); const results = await api.methodReturningAPromise( "bacon", 42 ); for ( let i = 0; i < results.length; i!++ ) { !// stuff!!... } } catch( err ) { console.log( err ); } } doTheThing(); async-await-example.js

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const ApiService = require( "./app/ApiService" ); const api = new ApiService( { port: 8888 } ); !// Async-await callback async function doTheThing() { try { const users = await api.asyncMethodReturningUsers(); const results = await api.methodReturningAPromise( "bacon", 42 ); for ( let i = 0; i < results.length; i!++ ) { !// stuff!!... } } catch( err ) { console.log( err ); } } doTheThing(); async-await-example.js

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const ApiService = require( "./app/ApiService" ); const api = new ApiService( { port: 8888 } ); !// Async-await callback async function doTheThing() { try { const users = await api.asyncMethodReturningUsers(); const results = await api.methodReturningAPromise( "bacon", 42 ); for ( let i = 0; i < results.length; i!++ ) { !// stuff!!... } } catch( err ) { console.log( err ); } } doTheThing(); async-await-example.js

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function convertToCelsius( f ) { return ( f - 32 ) * ( 5 / 9 ); } function convertToFahrenheit( c ) { return ( c * ( 9 / 5 ) ) + 32; } const temp = { freezingCelsius: 0, freezingFahrenheit: 32, boilingCelsius: 100, boilingFahrenheit: 212, convertToCelsius, convertToFahrenheit }; module.exports = temp; temperature.js

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function convertToCelsius( f ) { return ( f - 32 ) * ( 5 / 9 ); } function convertToFahrenheit( c ) { return ( c * ( 9 / 5 ) ) + 32; } const temp = { freezingCelsius: 0, freezingFahrenheit: 32, boilingCelsius: 100, boilingFahrenheit: 212, convertToCelsius, convertToFahrenheit }; module.exports = temp; temperature.js

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function convertToCelsius( f ) { return ( f - 32 ) * ( 5 / 9 ); } function convertToFahrenheit( c ) { return ( c * ( 9 / 5 ) ) + 32; } const temp = { freezingCelsius: 0, freezingFahrenheit: 32, boilingCelsius: 100, boilingFahrenheit: 212, convertToCelsius, convertToFahrenheit }; module.exports = temp; temperature.js

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function convertToCelsius( f ) { return ( f - 32 ) * ( 5 / 9 ); } function convertToFahrenheit( c ) { return ( c * ( 9 / 5 ) ) + 32; } const temp = { freezingCelsius: 0, freezingFahrenheit: 32, boilingCelsius: 100, boilingFahrenheit: 212, convertToCelsius, convertToFahrenheit }; module.exports = temp; temperature.js

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function convertToCelsius( f ) { return ( f - 32 ) * ( 5 / 9 ); } function convertToFahrenheit( c ) { return ( c * ( 9 / 5 ) ) + 32; } const temp = { freezingCelsius: 0, freezingFahrenheit: 32, boilingCelsius: 100, boilingFahrenheit: 212, convertToCelsius, convertToFahrenheit }; module.exports = temp; temperature.js const t = require( "./temperature" ); const c = t.boilingCelsius; const f = t.convertToFahrenheit( c ); console.log( `${ c } C is ${ f } F` ); !// output: 100 C is 212 F temp-example.js

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function convertToCelsius( f ) { return ( f - 32 ) * ( 5 / 9 ); } function convertToFahrenheit( c ) { return ( c * ( 9 / 5 ) ) + 32; } const temp = { freezingCelsius: 0, freezingFahrenheit: 32, boilingCelsius: 100, boilingFahrenheit: 212, convertToCelsius, convertToFahrenheit }; module.exports = temp; temperature.js const t = require( "./temperature" ); const c = t.boilingCelsius; const f = t.convertToFahrenheit( c ); console.log( `${ c } C is ${ f } F` ); !// output: 100 C is 212 F temp-example.js

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function convertToCelsius( f ) { return ( f - 32 ) * ( 5 / 9 ); } function convertToFahrenheit( c ) { return ( c * ( 9 / 5 ) ) + 32; } const temp = { freezingCelsius: 0, freezingFahrenheit: 32, boilingCelsius: 100, boilingFahrenheit: 212, convertToCelsius, convertToFahrenheit }; module.exports = temp; temperature.js const t = require( "./temperature" ); const c = t.boilingCelsius; const f = t.convertToFahrenheit( c ); console.log( `${ c } C is ${ f } F` ); !// output: 100 C is 212 F temp-example.js

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function convertToCelsius( f ) { return ( f - 32 ) * ( 5 / 9 ); } function convertToFahrenheit( c ) { return ( c * ( 9 / 5 ) ) + 32; } const temp = { freezingCelsius: 0, freezingFahrenheit: 32, boilingCelsius: 100, boilingFahrenheit: 212, convertToCelsius, convertToFahrenheit }; module.exports = temp; temperature.js const t = require( "./temperature" ); const c = t.boilingCelsius; const f = t.convertToFahrenheit( c ); console.log( `${ c } C is ${ f } F` ); !// output: 100 C is 212 F temp-example.js

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function convertToCelsius( f ) { return ( f - 32 ) * ( 5 / 9 ); } function convertToFahrenheit( c ) { return ( c * ( 9 / 5 ) ) + 32; } const temp = { freezingCelsius: 0, freezingFahrenheit: 32, boilingCelsius: 100, boilingFahrenheit: 212, convertToCelsius, convertToFahrenheit }; module.exports = temp; temperature.js const t = require( "./temperature" ); const c = t.boilingCelsius; const f = t.convertToFahrenheit( c ); console.log( `${ c } C is ${ f } F` ); !// output: 100 C is 212 F temp-example.js

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import { readFile } from "node:fs/promises"; export async function readFileJson( fileName ) { const text = await readFile( fileName ); const data = JSON.parse( text ); return data; } esm-module-example.js

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import { readFile } from "node:fs/promises"; export async function readFileJson( fileName ) { const text = await readFile( fileName ); const data = JSON.parse( text ); return data; } esm-module-example.js

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import { readFile } from "node:fs/promises"; export async function readFileJson( fileName ) { const text = await readFile( fileName ); const data = JSON.parse( text ); return data; } esm-module-example.js

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esm-module-example.js import { readFile } from "node:fs/promises"; export async function readFileJson( fileName ) { const text = await readFile( fileName ); const data = JSON.parse( text ); return data; } esm-example.js import { readFileJson } from "./esm-module-example.mjs"; const baconFile = new URL( "./bacon.json", import.meta.url ); const bacon = await readFileJson( baconFile ); console.log( bacon );

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esm-module-example.js import { readFile } from "node:fs/promises"; export async function readFileJson( fileName ) { const text = await readFile( fileName ); const data = JSON.parse( text ); return data; } esm-example.js import { readFileJson } from "./esm-module-example.mjs"; const baconFile = new URL( "./bacon.json", import.meta.url ); const bacon = await readFileJson( baconFile ); console.log( bacon );

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const sql = require( "mssql" ); !// Read from environment variables const cnx = process.env.SQL_CONNECTION; async function getAccountByEmail( email ) { try { const pool = await sql.connect( cnx ); const result = await pool.request() .input( "email", sql.VarChar( 100 ), email ) .query( "select * from accounts where email = @email" ); return result; } catch ( err ) { !// log error } } sql-example.js

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const sql = require( "mssql" ); !// Read from environment variables const cnx = process.env.SQL_CONNECTION; async function getAccountByEmail( email ) { try { const pool = await sql.connect( cnx ); const result = await pool.request() .input( "email", sql.VarChar( 100 ), email ) .query( "select * from accounts where email = @email" ); return result; } catch ( err ) { !// log error } } sql-example.js

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const sql = require( "mssql" ); !// Read from environment variables const cnx = process.env.SQL_CONNECTION; async function getAccountByEmail( email ) { try { const pool = await sql.connect( cnx ); const result = await pool.request() .input( "email", sql.VarChar( 100 ), email ) .query( "select * from accounts where email = @email" ); return result; } catch ( err ) { !// log error } } sql-example.js

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const sql = require( "mssql" ); !// Read from environment variables const cnx = process.env.SQL_CONNECTION; async function getAccountByEmail( email ) { try { const pool = await sql.connect( cnx ); const result = await pool.request() .input( "email", sql.VarChar( 100 ), email ) .query( "select * from accounts where email = @email" ); return result; } catch ( err ) { !// log error } } sql-example.js

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const sql = require( "mssql" ); !// Read from environment variables const cnx = process.env.SQL_CONNECTION; async function getAccountByEmail( email ) { try { const pool = await sql.connect( cnx ); const result = await pool.request() .input( "email", sql.VarChar( 100 ), email ) .query( "select * from accounts where email = @email" ); return result; } catch ( err ) { !// log error } } sql-example.js

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const sql = require( "mssql" ); !// Read from environment variables const cnx = process.env.SQL_CONNECTION; async function getAccountByEmail( email ) { try { const pool = await sql.connect( cnx ); const result = await pool.request() .input( "email", sql.VarChar( 100 ), email ) .query( "select * from accounts where email = @email" ); return result; } catch ( err ) { !// log error } } sql-example.js

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const sql = require( "mssql" ); !// Read from environment variables const cnx = process.env.SQL_CONNECTION; async function getAccountByEmail( email ) { try { const pool = await sql.connect( cnx ); const result = await pool.request() .input( "email", sql.VarChar( 100 ), email ) .query( "select * from accounts where email = @email" ); return result; } catch ( err ) { !// log error } } sql-example.js

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const sql = require( "mssql" ); !// Read from environment variables const cnx = process.env.SQL_CONNECTION; async function getAccountByEmail( email ) { try { const pool = await sql.connect( cnx ); const result = await pool.request() .input( "email", sql.VarChar( 100 ), email ) .query( "select * from accounts where email = @email" ); return result; } catch ( err ) { !// log error } } sql-example.js

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const sql = require( "mssql" ); !// Read from environment variables const cnx = process.env.SQL_CONNECTION; async function getAccountByEmail( email ) { !!... } module.exports = { getAccountByEmail }; sql-example.js

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Developer tools Package(s) Description eslint lint and format rules for JavaScript nodemon automatically restarts in dev node:test, jest, mocha test frameworks testdouble, sinon spies, stubs, mocks

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Recommended tools Package(s) Description dotenv loads environment variables from a .env file fs-extra adds convenient extensions to file system fetch, axios, or got http clients socket.io sockets, real-time commander command-line argument library for building CLIs nexe compile app to a standalone executable

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Frameworks • Express.js • Fastify • Nest.js • Electron.js

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Integration Strategies • Node.js as proxy, use http client • nginx • Messaging (e.g. RabbitMQ, ZeroMQ Azure Service Bus)

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https://bit.ly/node-crash-course