Working with NodeJS, CouchDB and Express Framework

This is a simple example of using node.js, nano (couch db modules) and the express framework to retrieve some data from a couch instance.

Setting up the modules

We will be using a couch instance from www.iriscouch.com. The database will be named “employees”.

var nano = require('nano')('http://lugomatic.iriscouch.com');
var db = nano.use('employees');

We need to include the express module and create an express server:

var app = require('express').createServer();

With all modules setup it should look like this.

var nano = require('nano')('http://lugomatic.iriscouch.com');
var db = nano.use('employees');
var app = require('express').createServer();

We need to give express access to the imgs, css and js directories so it can retrieve our assets.

app.configure(function(){
 app.use("/public", express.static(__dirname + '/public'));
});

Setting up a route

We are setting up a route to “all” that will call a view from the couch instance and retrieve some data.

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app.get('/all', function(req, res){
	db.view('getAll','getAll',function (error, body, headers) {
     res.send(body, 200);
    });
}); 

Starting sever

app.listen(3000);
console.log('App is running at http://localhost:3000');

Point your browser to http://localhost:3000/all. You should see a JSON object return like below. I only added 2 employees for the demo.

{
    "total_rows": 2,
    "offset": 0,
    "rows": [{
        "id": "8c370768eafc4d67b0d743ffc5000e5d",
        "key": "Eric Vaughan",
        "value": ["Web Developer", true]
    }, {
        "id": "8c370768eafc4d67b0d743ffc5002f27",
        "key": "Joe Lopez",
        "value": ["Web Developer", true]
    }]
}

I will go over how to create a couch instance, create a view and add some data in another post.