1.
An introduction to hapi.js
Dave Stevens
@davestevens84 | davestevens84@gmail.com

2.
What is hapi.js?
• Framework for building web applications and
services
• Eran Hammer
• Walmart
• Robust, Stable, Reliable
• Security is a key consideration

3.
BENEFITS
What’s so great about hapi

4.
Modularization
• Allows for logical modularization of your
application
• Rich plugin interface
• Large application can be easily distributed
over multiple smaller modules

5.
Tested at scale
• All Walmart Black Friday traffic 2 years
running
• Didn’t explode
• APIs and web applications at Yahoo, Disney,
Paypal and Zappos

6.
Eco-system
• Good (process monitoring and logging)
• Good-replay (replay log events!)
• Glue (compose servers from manifests)
• TV (Interactive debug console)
• Joi (Schema validation)
• Etc… https://github.com/hapijs

7.
Installing
• npm install --save hapi

8.
Creating a server
var Hapi = require(‘hapi’);
var server = new Hapi.Server();
server.connection({
host:’localhost’,
port: 9009
});

9.
Creating a server (2)
server.route({
path: ‘/’,
method: ‘GET’,
handler: function (request, reply) {
reply(‘Hi VegasJS!’);
}
});
server.start();

10.
Routing
server.route({
path: ‘/’,
method: ‘GET’,
handler: function (request, reply) {
reply(‘Hi VegasJS!’);
}
});
Values surrounded by {} populate request.params in handler
e.g. path:‘/name/{firstname}’ would mean that /name/dave results
in request.params.firstname being equal to ‘dave’
Very configurable to handle multitude of eventualities – one example,
multi-segment parameters:
path: ‘/name/{names*}’ then requesting /name/dave/andrew/stevens
would result in request.params.names being ‘dave/andrew/stevens’
which we can split on ‘/’ to create array, etc.

11.
Routing
server.route({
path: ‘/’,
method: ‘GET’,
handler: function (request, reply) {
reply(‘Hi VegasJS!’);
}
});
Specify HTTP method here, can also have multiple methods in
An array eg.
method: [‘PUT’, ‘POST’],

12.
Routing
server.route({
path: ‘/’,
method: ‘GET’,
handler: function (request, reply) {
reply(‘Hi VegasJS!’);
}
});

13.
Plugins
• Allow you to build out your application
components as self-contained modules
• Also manipulate requests and other events,
hook in to server events, etc.
• Kinda like middleware but think bigger!

14.
Decorate
• Avoid duplicate code by using
server.decorate
server.decorate(‘reply’, ‘error’, function (err) {
console.error(err);
return this.response({message: ‘There was an
error’}).code(500);
});
// in handler, reply.error(err);

15.
Next Steps
• > npm install –g makemehapi
• > makemehapi
• Challenges and guided learning!
• Talk to me
• #hapijs on Twitter (official: @hapijs)
• #hapi on Freenode IRC
• http://bit.ly/orghapi

16.
Obligatory “Look, I Finished” Slide
• Twitter @davestevens84
• Email davestevens84@gmail.com
• Accost me in the street