Hello world - intro to node js
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The document provides an overview of Node.js, emphasizing its capabilities as a server-side JavaScript platform designed for scalable network applications using asynchronous, non-blocking I/O. It includes installation instructions, use cases like REST APIs and real-time applications, and discusses popular packages and frameworks such as Express. Additionally, it highlights community resources and notable contributors to Node.js development.
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Hello world - intro to node js
- 2. HELLO WORLD
- 5. 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
- 6. Who uses it?
- 7. 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
- 8. Test out the repl • From the command line type `node` • Type out commands and hit enter
- 9. Use cases • REST APIs • Streaming data • High concurrency • Leveraging UNIX tools • Realtime applications
- 10. Event Driven
- 11. Event Driven
- 12. Sync vs Async
- 15. Asynchronous (Non-Blocking) • Node is built for async i/o • Sometimes difficult to understand • Callback soup
- 16. Let’s run it
- 17. HTTP Server
- 18. 5 lines of code Let’s run it
- 19. HTTP Server
- 21. • 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
- 22. Package.json
- 23. npm install
- 24. 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
- 25. Example app
- 26. Example app Basic REST api
- 27. What do we need? • HTTP server • Postgres database • Postgres client • JSON formatted responses
- 28. We have an HTTP server
- 29. Problems? • One handler replying to every request • Missing • Routing/URL parameters • Response formatting
- 30. Introducing Express • 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
- 32. Let’s code
- 33. 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
- 34. 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