Adding Routes:

var Hapi = require('hapi');
var server = new Hapi.Server(3000);

server.route({
    method: 'GET',
    path: '/',
    handler: function (request, reply) {
        reply('Hello, world!');
    }
});
server.route({
method: 'GET',
    path: '/test',
    handler: function (request, reply) {
        reply('Hello, test world!');
    }
});

server.route({
    method: 'GET',
    path: '/{name}',
    handler: function (request, reply) {
        reply('Hello, ' + encodeURIComponent(request.params.name) + '!');
    }
});

server.start(function () {
    console.log('Server running at:', server.info.uri);
});

Save the file and start the server again. You’ll get “Hello world” text as a response in browser if you try to visit http://localhost:3000. “Hello, test world” for  http://localhost:3000/test and “Hello, haseeb” for http://localhost:3000/haseeb .If you want to explore more about the routes in hapi, check out this routing tutorialby hapi.js.Next we’ll jump into write REST API.

REST is basically a well defined way of interacting with web-servers. Resources are requested via URLs. RESTful services are about using various HTTP methods (GET, POST, PUT, DELETE) to manipulate data. Hapi.js can do it all with ease. We will write a simple API that allow us to get and save todo items. Initially our application will have an array consist of todo items. Each item will be an object.

var Hapi = require('hapi');
var todos = [
{
todo : “take a nap”,
note : “note for nap”
},
{
todo : “buy a book”,
note : “note for book”
},
{
todo : “read a blog”,
note : “note for blog”
},
];
var server = new Hapi.Server(3000);

server.route({
method: 'GET',
path: '/todos',
handler: function (request, reply) {
reply(todos);
}
});

server.route({
method: 'GET',
path: '/todo/{id}',
handler: function (request, reply) {
if (request.params.id) {
console.log(todos.length);
if (todos.length < request.params.id) {
return reply('No item found.').code(404);
}
return reply(todos[request.params.id-1]);
}
reply(todos);
}
});

You will get the item according to the id parameter. Save the file and start the server so you can test:http://localhost:3000/todo/1

http://localhost:3000/todo/2

http://localhost:3000/todo/3

Now we write a POST route for saving a todo item in our array that we get from POST request. we will add a validation object to ensure that all data is posted; otherwise, an error is returned. Joi is validation module which we use to validate our posted data.

server.route({
method: 'POST',
path: '/todos',
config: {

handler: function (request, reply) {
var newTodo = {
todo: request.payload.todo,
note: request.payload.note
};
todos.push(newTodo);
reply(todos);
           },

       validate: {
payload: {
todo: joi.string().required(),
note: joi.string().required()
}
}

}
});

”joi” here is a module that we require by:

var joi = require(“joi”);

$ curl -X POST -H "Content-Type: application/json" -d '{"todo":"Build API", "note":"Hapi is is amazing"}' -i http://localhost:3000/todos

We need to add ability to DELETE also.

server.route({
method: 'DELETE',
path: '/todo/{id}',
handler: function(request, reply) {
if (todos.length < request.params.id) {
return reply('No Todo found.').code(404);
}
todos.splice((request.params.id-1), 1);
reply(true);
}
});

$ curl -X DELETE http://localhost:3000/todo/2 -i

As you have noticed that we are passing “2” as id of the todo. It will delete 2nd todo from our todo list.

Enough with hapi and its routes. Now we need to add MongoDB in the game as data player. As of yet, we were using a local data object “todos” for storing data. And obviously this isn’t the real motive for storing data on the server. We want to keep it secure in the database. So let’s get it done too.

Installing MongoDB

First we need to download and install mongoDB. Brew is an appropriate tool to automate mongodb installation.

$ brew update
$ brew install mongodb

For more options to install mongodb, check the following link :http://docs.mongodb.org/manual/tutorial/install-mongodb-on-os-x/

On a successful installation, you’ll be able to access “mongod” ( primary daemon process for the MongoDB system) and “mongo” (CLI) from terminal or command prompt.

On “Mongo” CLI, there are is a lot you can do. Create and explore DBs, collections and data rows. Just like the mysql cli. Its amazing to operate it via command line. Play around with it a bit.

There is more help available on mongodb site to understand it.You should check this: http://docs.mongodb.org/manual/tutorial/getting-started/

For a small exercise, create a db name “mytodos” and within that db create a collection name “todos” and add few records in that collection.

All of this can easily done by mongo cli with executing few lines. Make sure you are inserting a document.