Hello world - intro to node js
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Jeff Andersen from GoInstant Have you ever thought that writing web applications should allow you to use your mad Javascript skillz on the server side as well? Node.js is such a platform. Bundling up the Google Chrome Javascript runtime, Node lets you easily building fast and scalable network applications perfect for the real-time web. It's also a pretty great platform for building basic data driven websites too. Jeff, a web developer at Halifax based GoInstant, will introduce us to the Node platform, exploring it from the ground up.
Transcript of Hello world - intro to node js
HELLO WORLD
Jeff AndersenDeveloperTwitter: @jeffandersen Email: [email protected]
What is Node.js?• In a nutshell: server-side JavaScript
• Used to build scalable network applications
• Built on Google’s v8 JavaScript engine
• Event-driven, non-blocking (asynchronous) I/O
Who uses it?
Installing Node.js• Visit nodejs.org
• Download the package/installer and run
• Alternatively: use nvm - Node Version Manager (Similar to Ruby’s RVM) https://github.com/creationix/nvm
Test out the repl• From the command line type `node`
• Type out commands and hit enter
Use cases• REST APIs
• Streaming data
• High concurrency
• Leveraging UNIX tools
• Realtime applications
Event Driven
Event Driven
Sync vs Async
Synchronous (Blocking)
Asynchronous (Non-Blocking)
Asynchronous (Non-Blocking)
• Node is built for async i/o
• Sometimes difficult to understand
• Callback soup
Let’s run it
HTTP Server
5 lines of codeLet’s run it
HTTP Server
• npmjs.org
• Open source software
• Official package manager for Node.js
• Nearly 55 thousand packages and almost 2.5 million downloads per day
• package.json
Package.json
npm install
Recommended Modules• async - Higher-order functions and common patterns for
asynchronous code
• lodash - A utility library delivering consistency, customization, performance, & extras.
• express - Sinatra inspired web development framework
• mocha - simple, flexible, fun test framework
• pg - PostgreSQL client
• redis - Redis client
Example app
Example appBasic REST api
What do we need?• HTTP server
• Postgres database
• Postgres client
• JSON formatted responses
We have an HTTP server
Problems?• One handler replying to every request
• Missing
• Routing/URL parameters
• Response formatting
• npm install express
• Sinatra style web framework
• Simple verb-based request handlers
• Full-featured router
• body parser, url parameters, query string parsing
• Automatic response formatting
Introducing Express
Same functionality
Let’s code
What could be added?• OAuth middleware
• Middleware: A function that processes a request, typically on an interim basis to the final request handler.
• Permissions & token scopes
• JSON web hooks
Twitter recommendations• @izs - Isaac Schlueter, Creator of NPM & Node core gate keeper
• @eranhammer - Eran Hammer, Walmart Labs & OSS contributor
• @substack - James Halliday, Node module authoring machine
• @tjholowaychuk - TJ Holowaychuk, Author: Express, Mocha, etc
• @igrigorik - Ilya Grigorik, Developer advocate at Google
• @jeresig - John Resig, Creator of jQuery
• @goinstant - Realtime Collaboration API and Backend
