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Node.js program structure in MEAN environment

I'm currently working on a web application based on the popular MEAN stack (MongoDB, Express, AngularJS and Node.js). As I am still struggling with some aspects of node.js, I would like to ask for your advice and opinion on a major architecure decision of mine.
As I found Jade rather ugly (notation-wise) and did not want the server to render webpages (for cpu power saving reasons), I chose to always send back prepared html files/templates.
Example:
app.get('/', function(req, res) {
res.sendfile("public/index.html");
});
On the client side, I then initiate further Angular-JSON based communication to realize REST webservices to instantly get and fill in the needed data. Any reasonable arguments against this approach or maybe good points why I should be using a render engine on the server side?
Besides, does anyone know a good online tutorial for a multipage web application featuring user registration/validation, authentication process, rest webservices and so on? Something newbies can take a look at to get a feeling of how to structure a medium to large sized node.js application well? I've been googling for days now but feel that all tutorials I found were always missing essential ingredients or were rather "elementary".
Thanks in advance.
Igor

I started with Node.js like 2 month ago and now I am starting a project following this same approach.
In the same way, I am not using a "render engine", mainly because I am planning to use my client code (angular) to create a hybrid application using cordova (phoneGap).
I learned a lot from the tutorials of Node.js in Pluralshigh:
http://pluralsight.com/training/Courses/TableOfContents/building-angularjs-nodejs-apps-mean
http://pluralsight.com/training/Courses/TableOfContents/nodejs-dotnet-developers
Finally, regarding security, "Passport" is a great library to implement authentication.
btw: I am using Token-Based Authentication.
And the answer to "how integrate Passport with tokens", I found it here:
passport-local with node-jwt-simple

Integration of Node.js and Backbone.js

I have done considerable reading on both Node.js and Backbone.js; I've read some tutorials and done the relevant courses on Code School. I feel that I've got a pretty good idea of the functions that each technology serves in the context of a web application.
My problem is that I don't really know how to integrate the two technologies and use them in tandem. I would really appreciate if someone could point me to a resource which goes through the entire development of an application using Node, MongoDB, and Backbone together.
Many thanks

This is a good tutorial that shows how to setup that entire stack.
http://backbonetutorials.com/nodejs-restify-mongodb-mongoose/
In short...
Node.js
You can use a library like restify to provide a restful API for your client-side Backbone application. It can also serve your static assets for your Backbone application. The example uses restify, but could be accomplished with other libraries like express.
Mongoose
Mongoose is a javascript abstraction layer for MongoDB. This provides an easy way to interact with MongoDB from Node.js.
Backbone
Your Backbone application can utilize your restify node.js backend to handle the model synchronization. You should have plenty of control to setup the routes via restify in a way that makes Backbone happy.

This ebook could be useful (it's on Backbone, but uses Node for the backend):
http://addyosmani.github.io/backbone-fundamentals/
You also may want to look at this book:
http://www.amazon.com/Building-Node-Applications-MongoDB-Backbone/dp/1449337392

There is also Node Cellar Source.
There is not much explanation about the code, but the app is simple enough to get started and understand the basics layouts of node / backbone
It is, i think, just between an 'Hello World' code and a full app.

I use for ap in backbone yeoman https://github.com/yeoman/generator-backbone and you use it with node.js too

create rest api: http://coenraets.org/blog/2012/10/creating-a-rest-api-using-node-js-express-and-mongodb/
code backbone on the client: http://coenraets.org/blog/2012/10/nodecellar-sample-application-with-backbone-js-twitter-bootstrap-node-js-express-and-mongodb/
the backbonetutorials.com restify one is out of date. It's best to use express, especially if you plan to do any authorization. It's also more widely used

This is a comprehensive tutorial on rolling your own blog with Nodejs, Mongodb and expressjs
http://howtonode.org/express-mongodb
It's old but with a little effort you can get it to work and learn at the same time

I have found this to be the most up to date material on using Backbone.js with node
http://amzn.to/1DygKlJ

Writing Real-Time apps with NodeJS

im looking forward to build RT web apps with NodeJS. Coming from Rails, I've felt in love with NodeJS and Async JS programming.
Run a few experiments with Node, and then as I search tools and resources to get used with, I got overwhelmed with the lot of stuff over there.
I found lot's of libraries and components over there, and pretty much got confused on how a large-scale well-writen and implemented RT web app should be built.
So the app will run over NodeJS, using Express framework.
I read about knockout.js, a client-side library to provide realtime stuff like automatic UI refresh, and I guess I could conbine it with jQuery.
Also, I found socket.io.
The author says:
Socket.IO aims to make realtime apps possible in every browser and mobile device, blurring the differences between the different transport mechanisms. It's care-free realtime 100% in JavaScript.
So socket.io is about compatibility.
What about backbone.js? Where does it goes to?
With so much stuff, I got shocked. What should I learn? Which modules worth studing?
Im focusing on NodeJS and Express but most books/screencasts covers old versions of nodejs. So im being guided by its official API.
Now im here asking your advice and to organize somehow all the info out there.
Correct me if my assumptions are not precise, please point me to the right direction and feel free to suggest any other module that could help on my learning.
Thanks in advance

It might be useful for you to separate the node.js server side libraries (via npm etc...) from all of the client side (browser) libraries and technologies like jquery, backbone, knockout etc... when you think about it. Even socket.io which exposes a persistent socket connection between the browser and the server (to avoid polling) does not dictate what client side technologies you use.
Focus on exposing a solid web-api ( random example ) from your server and your client technologies can be swapped, augmented etc... with no effect on the server. The only place they intersect is if you're using a view technology like Jade. It's also an option to have a pure separation where the server is just serving up the client files and your client is a thicker javascript application (using knockout, jquery etc...) calling a good server web api.
Some folks try to unify the client and server models - for example, this article using backbone and node. It depends on how much data you work with to say whether that's feasible but it does couple the client and server and makes the server stateful which can have downsides (scale out, requires affinity etc...). Personally, I get wary of that much magic (binding, state, syncing etc...). Node is about keeping things simple, light and fast. It's a fast front end network server.
My 2 cents (and some may disagree). Start with node on the server and pick your storage (mongoDb etc...). Design a solid RESTful (hypermedia) API - a good webapi regardless of the client. Then start with a basic html/css/js, maybe jquery client and add things like knockout etc... as you expand your client skills. That will allow you to replace your client technologies independent of your server as the new technology winds change (and they will).
That's the hallmark of a well designed system - the ability to replace componets/sub-systems without rewriting everything :)
Hope that helps clear up some of the fog :)

You may want to look at Meteor if you are focussing on real-time Javascript apps: http://meteor.com/

Is Node.js a good alternative to build complete websites?

I'm wondering if using Node.js (express.js) is the best option to go for a complete website. I've been using Rails + Node.js and am wondering if this is still the best option or if I should move completely to Node.js.
Are there websites built completely with node.js? I imagine it must lack many things Rails offers.

I imagine it must lack many things
Rails offers.
I gave a short list below but I would like to know what you could be missing and I think(almost certain) we can give you some alternatives on node.js.
Modules
node.js is getting pretty complete and I think you can run your entire site using only node.js using for example the following modules. I assume you know about npm. If not I really advice you to google for it and learn that. To search npm you can use http://search.npmjs.org:
web framework:
High performance, high class web
development for Node.js
https://github.com/visionmedia/express
Socket.IO aims to make realtime apps possible in every browser and mobile
device, blurring the differences
between the different transport
mechanisms.
https://github.com/learnboost/socket.io-node
I believe with these two web-frameworks you can create a lot of sites. For example express is a very powerfull web framework and supports a lot of cool things like:
session support.
a lot powerful template engines. I like Jade for example. You could also share these between client and server a lot of the times easily.
excellent routing.
just to name a few.
database:
Redis is an open source, advanced
key-value store. It is often referred
to as a data structure server since
keys can contain strings, hashes,
lists, sets and sorted sets.
https://github.com/mranney/node_redis
MongoDB (from "humongous") is a scalable, high-performance, open source,
document-oriented database.
Mongoose is a MongoDB object modeling tool designed to work in an
asychronous environment.
https://github.com/learnboost/mongoose/
With those two databases I think you should be able to accomplish most of your tasks. The nice thing is that Redis is extremely fast/simple advanced KV-store(dataset in memory/also supports VM) and supports replication while Mongodb is more completely(slower then redis) and also supports sharding.
authentication:
Authentication and authorization (password, facebook, & more) for your node.js Connect and Express apps.
https://github.com/bnoguchi/everyauth
Like I said previously you can get a long way with only these modules.

Express.js is more akin to Sinatra. They're simpler frameworks than rails.
Express's list of sites is fairly small http://expressjs.com/applications.html
So I think it's also good to look at Sinatra's list http://www.sinatrarb.com/wild.html
So to answer your questions in reverse order. Yes it lacks all the features of rails. Yes there are sites written completely in Express. And going to 100% Node.js might be the right decision for your site.
It depends on which features you'd miss and what performance you need.

I'm not sure, but I guess it's perfectly possible. I have built complete sites using plain server side javascript for years without problems. The advantage of node.js seems to be its event driven model and things like socket.io. I just started experimenting with it, I'll probably will try porting an existing site to node.js.
Here you can find a large list of sites built with node.js.
Finally, you may want to read: What it’s like building a real website in Node.js

Yes, as of now node.js lacks many (well, at least a few) things rails offers. Eventually the set of available node.js modules will collectively provide good alternatives to RoR across the board. Or at least different (and often more modern) approaches to the same fundamental problems. There are still some important things missing in the node.js ecosystem including a good ORM for postgresql (rails has ActiveRecord which is great) and a good DB schema management subsystem. Both of these do not exist in the node.js ecosystem as of this moment, but surely they will be there in due time. Rails has these down pat right now.
There are some tricks node.js has that RoR doesn't. Debugging in node.js is more seamless than RoR and express.js is more flexible. Express is the library approach (you tell it what to do) whereas rails is the framework approach (you fill out the boilerplate it creates for you). There are also some fantastic things like stylus and jade, which have equivalents in rails, but when you have a full app written in one language (either javascript or CoffeeScript, which I prefer) and everything is in a modern node.js/TJ Holowaychuck style, you get a level of cohesiveness that is really nice to work within.
The other thing to keep in mind is that while the list of available node.js modules is quite impressive, many of them are not as mature and battle-tested as their rails/django analogs. It's hit or miss, so beware.

can we use couchdb for web application development?

I was wondering whether we can use java script for application development and use couchdb to serve it. I was also imagining jquery as the java script library. Do you think this is possible?

Check out using CouchApp. CouchApp allows you to build your application in JavaScript and host it out of CouchDB. Its a great way to learn CouchDB and its a very rapid development environment.
CouchApp

Sure you can. Following is a link to a blogging project being developed with couchdb as the backend and PHP as the front. Its open source so you might get some ideas by looking at its code.
Arik Blogging Software

Like others pointed out, CouchApps are one of they key features of CouchDB. CouchDB's built-in admin interface “Futon” is built that way. — The example application in CouchDB: The Definitive Guide (free online book) is also a CouchApp: http://guide.couchdb.org/