Connect to Cloudant CouchDB with Node.js?

Question

I am trying to connect to my CouchDB database on Cloudant using Node.js.

This worked on the shell:

    curl https://weng:password@weng.cloudant.com/my_app/_all_docs

But this node.js code didn't work:

    var couchdb = http.createClient(443, 'weng:password@weng.cloudant.com', true);
    var request = couchdb.request('GET', '/my_app/_all_docs', {
        'Host': 'weng.cloudant.com'
    });
    request.end();
    request.on('response', function (response) {
        response.on('data', function (data) {
            util.print(data);
        });
    });

It gave me this data back:

    {"error":"unauthorized","reason":"_reader access is required for this request"}

How do I do to list all my databases with Node.js?

Answer 1

The built-in Node.js http client is pretty low level, it doesn't support HTTP Basic auth out of the box. The second argument to http.createClient is just a hostname. It doesn't expect credentials in there.

You have two options:

1. Construct the HTTP Basic Authorization header yourself

var Base64 = require('Base64');
var couchdb = http.createClient(443, 'weng.cloudant.com', true);
var request = couchdb.request('GET', '/my_app/_all_docs', {
    'Host': 'weng.cloudant.com',
    'Authorization': 'Basic ' + Base64.encode('weng:password')
});
request.end();
request.on('response', function (response) {
    response.on('data', function (data) {
        util.print(data);
    });
});

You will need a Base64 lib such as one for node written in C, or a pure-JS one (e.g. the one that CouchDB Futon uses).

2. Use a more high-level Node.js HTTP client

A more featureful HTTP client, like Restler, will make it much easier to do the request above, including credentials:

var restler = require('restler');
restler.get('https://weng.cloudant.com:443/my_app/_all_docs', {
    username: 'weng',
    password: 'password'
}).on('complete', function (data) {
    util.print(data);
});

Answer 2

There are lots of CouchDB modules for Node.js.

• node-couch - a CouchDB connector
• node-couchdb - A full API implementation
• node-couchdb-min - Light-weight client with low level of abstraction and connection pooling.
• cradle - a high-level, caching, CouchDB client

Answer 3

Just wanted to add

• nano - minimalistic couchdb driver for node.js

to the list. It is written by Nuno Job, CCO of nodejitsu, and actively maintained.

Answer 4

This answer is looking a bit dated. Here is an updated answer that I verified using the following Cloudant Supported NPM Node Client library that works. https://www.npmjs.com/package/cloudant#getting-started

And to answer his question on how to list his databases use the following code.

//Specify your Cloudant Database Connection URL. For Bluemix format is: https://username:password@xxxxxxxxx-bluemix.cloudant.com

dbCredentials_url = "https://username:password@xxxxxxxxx-bluemix.cloudant.com"; // Set this to your own account 

// Initialize the library with my account. 
// Load the Cloudant library. 
cloudant = require('cloudant')(dbCredentials_url);

// List the Cloudant databases
cloudant.db.list(function(err, allDbs) {
console.log('All my databases: %s', allDbs.join(', ')) });