What is Node.js?

Introductory presentation for EVRY employees about what Node.js is and how it works.

Transcript

1. What is Node.js? ! HANS KRISTIAN FLAATTEN
2. ! Agenda OPTIONAL SUBHEADING • What is Node.js • Architecture • Packages • Example • Q&A
3. ! 3
4. ! 4 Node.js Stats ! v6.9.5 latest stable versions 16M " downloads/month
5. ! 5 NPM Stats ! 400k public packages 18B " downloads/month
6. ! 6 Typical Use Cases Ê Real Time Systems " Internet of Things # API backends
7. ! • Microsoft • PayPall • IBM • Wallmart • NASA • Netflix 7 Who uses Node.js • eBay • Uber • LinkedIn • Telenor • finn.no
8. ! How Node.js Works "
9. ! 9 Node.js architecture • Standard library / API • http, dns, fs, etc. • Google’s v8 JavaScript engine • libeuv for OS bindings
10. ! 10
11. ! 11
12. ! Packages $
13. ! 13
14. ! 14 npm package.json { "name": "my package", "version": "1.0.0", "scripts": { "test": "mocha test.js" }, "dependencies": { "express": "^4.2.1", "mongodb": "^2.3.5" } }
15. ! 15 npm package.json { "name": "my package", "version": "1.0.0", "scripts": { "test": "mocha test.js" }, "dependencies": { "express": "^4.2.1", "mongodb": "^2.3.5" } }
16. ! 16 npm package.json { "name": "my package", "version": "1.0.0", "scripts": { "test": "mocha test.js" }, "dependencies": { "express": "^4.2.1", "mongodb": "^2.3.5" } }
17. ! 17 npm install $ npm install
18. ! Example program %
19. ! 19 var express = require('express'); var app = express(); app.get('/', function(req, res){ res.send('Hello World'); }); app.listen(3000); console.log('Express started on port 3000');