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Getting Started with MongoDB and Node.js


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Slides from my talk at Mongo Seattle 2010.

Published in: Technology

Getting Started with MongoDB and Node.js

  1. 1. Getting Started With Node.js and mongoDB Grant Goodale (@ggoodale) 7/26/2010
  2. 2. What is ? “Evented I/O for V8 Javascript” – Application engine for “scalable network applications” Really freaking fast: One process, zero* threads (Almost) no blocking * actually, there is a thread pool. We’ll get to that.
  3. 3. What is ? High concurrency with low overhead No thread swapping or context switching Applications must be designed from the ground up to not block on I/O, CPU-intensive work, etc.
  4. 4. What Node.js Isn’t A full-stack web framework (a la Ruby on Rails) But! you can get there: ExpressJS: ( (Web framework with MongoDB support built in - similar to Sinatra) (Rack-like middleware for Node and Express) haml.js: (Pure js implementation of HAML)
  5. 5. What Node.js Isn’t (cont.) Great at sending large static files concurrently. (use nginx.) Buffer implementation in recent versions improves this dramatically: Completely non-blocking. CPU-intensive stuff will still block you (do it in a worker process). Some system calls (executed in a thread pool)
  6. 6. &
  7. 7. & Great together! Both: speak Javascript understand JSON documents are freaking fast. So, what should you build?
  8. 8. & You can build: Standard n-tier web applications Great way to learn mongoDB and Node Go build a blog engine! (Everyone does.) Lots of libraries to help you get started: ExpressJS, Connect, etc.
  9. 9. & You should build: Applications requiring high throughput and concurrency Applications with real-time needs Applications with long-polling connections Real-time multiuser chat Web or log analytics (e.g. Hummingbird)
  10. 10. Getting Started Grab the following: mongoDB: Node.js: npm, a package manager for Node: curl | sh
  11. 11. Getting Started Use npm to install a mongoDB driver for Node: npm install mongodb Tons of other fun stuff as well - full package list at
  12. 12. Evented I/O: a Primer Before:
  13. 13. Evented I/O: a Primer After:
  14. 14. Evented I/O: a Primer After:
  15. 15. Evented I/O: a Primer After:
  16. 16. A simple example: Syslog
  17. 17. Mongoose Cleans up a bit of the nested callback “fun”
  18. 18. Mongoose Cleans up a bit of the nested callback “fun”
  19. 19. Mongoose Adds ORM capabilities (but doesn’t mandate them)
  20. 20. Other Fun Stuff: (Need extensions? We got 'em.) Routers, file servers, frameworks, crypto... Cross-platform WebSockets Supports HTML5 websockets Falls back to Flash / AJAX in less capable browsers
  21. 21. Questions? twitter: ggoodale email: