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Node.js on multi-core machines

Node.js looks interesting, BUT I must miss something - isn't Node.js tuned only to run on a single process and thread?

Then how does it scale for multi-core CPUs and multi-CPU servers? After all, it is all great to make fast as possible single-thread server, but for high loads I would want to use several CPUs. And the same goes for making applications faster - seems today the way is use multiple CPUs and parallelize the tasks.

How does Node.js fit into this picture? Is its idea to somehow distribute multiple instances or what?


Source: (StackOverflow)

How to read environment variable in Node.js

Is there a way I can read environment variables in Node.js code?

Like for example Python's os.environ['HOME'].


Source: (StackOverflow)

Node.js/Windows error: ENOENT, stat 'C:\Users\RT\AppData\Roaming\npm'

I have Windows 7 32-bit. I installed the latest Node.js 32 bit. When I try to run the command npm install jquery, I receive the error:

Error: ENOENT, stat 'C:\Users\RT\AppData\Roaming\npm

How does one resolve it?


Source: (StackOverflow)

npm WARN package.json: No repository field

I installed expressjs with the following command:

sudo npm install -g express

I have the following warning:

npm WARN package.json range-parser@0.0.4 No repository field.
npm WARN package.json fresh@0.1.0 No repository field.
npm WARN package.json methods@0.0.1 No repository field.
npm WARN package.json methods@0.0.1 No readme data.
npm WARN package.json cookie-signature@1.0.1 No repository field.
npm WARN package.json send@0.1.0 No repository field.
npm WARN package.json pause@0.0.1 No repository field.
npm WARN package.json bytes@0.2.0 No repository field.
npm WARN package.json github-url-from-git@1.1.1 No repository field.
npm WARN package.json assert-plus@0.1.2 No repository field.
npm WARN package.json ctype@0.5.2 No repository field.

Im new to nodejs and expressjs. Why I have the above warnings? Should I be worried?


Source: (StackOverflow)

"message failed to fetch from registry" while trying to install any module

I can't install any node module from the npm.

npm install socket.io

The above command resulted to below output, it is not able to install socket.io

npm http GET https://registry.npmjs.org/socket.io

npm ERR! Error: failed to fetch from registry: socket.io
npm ERR!     at /opt/node0610/lib/node_modules/npm/lib/utils/npm-registry-client/get.js:139:12
npm ERR!     at cb (/opt/node0610/lib/node_modules/npm/lib/utils/npm-registry-client/request.js:32:9)
npm ERR!     at Request._callback (/opt/node0610/lib/node_modules/npm/lib/utils/npm-registry-client/request.js:137:18)
npm ERR!     at Request.callback (/opt/node0610/lib/node_modules/npm/node_modules/request/main.js:109:22)
npm ERR!     at Request.<anonymous> (/opt/node0610/lib/node_modules/npm/node_modules/request/main.js:198:58)
npm ERR!     at Request.emit (events.js:88:20)
npm ERR!     at ClientRequest.<anonymous> (/opt/node0610/lib/node_modules/npm/node_modules/request/main.js:195:10)
npm ERR!     at ClientRequest.emit (events.js:67:17)
npm ERR!     at CleartextStream.<anonymous> (http.js:1134:11)
npm ERR!     at CleartextStream.emit (events.js:67:17)
npm ERR! You may report this log at:
npm ERR!     <http://github.com/isaacs/npm/issues>
npm ERR! or email it to:
npm ERR!     <npm-@googlegroups.com>
npm ERR! 
npm ERR! System Linux 2.6.18-194.el5
npm ERR! command "node" "/opt/node0610/bin/npm" "install" "socket.io"
npm ERR! cwd /opt/node0610/lib/node_modules
npm ERR! node -v v0.6.10
npm ERR! npm -v 1.1.0-3
npm ERR! message failed to fetch from registry: socket.io
npm ERR! 
npm ERR! Additional logging details can be found in:
npm ERR!     /opt/node0610/lib/node_modules/npm-debug.log
npm not ok

My NPM Version is :

[applmgr@dev node_modules]$ npm --version
1.1.0-3

My NodeJS Version is :

[applmgr@dev node_modules]$ node --version
v0.6.10

Source: (StackOverflow)

How to make an HTTP POST request in node.js?

How can I make an outbound HTTP POST request, with data, in node.js?


Source: (StackOverflow)

How to change bower's default components folder?

I'm making a new project that uses bower from twitter. I created a component.json to maintain all my dependency like jquery. Then I run bower install that installs everything in a folder named components. But I need to install the components in a different folder, e.g. public/components.

I have tried editing my components.json into:

{
  "name": "test",
  "version": "1.0.0",
  "directory": "public/",
  "dependencies": {
    "jquery": "*"
  }
}

or:

{
  "name": "test",
  "version": "1.0.0",
  "componentsDirectory": "public/",
  "dependencies": {
    "jquery": "*"
  }
}

as shown in https://github.com/twitter/bower/pull/94 but it doesn't work.


Source: (StackOverflow)

module.exports vs exports in Node.js

I've found the following contract in a Node.js module:

module.exports = exports = nano = function database_module(cfg) {...}

I wonder whats the different between module.exports and exports and why both are used here.


Source: (StackOverflow)

How do I completely uninstall Node.js, and reinstall from beginning (Mac OS X)

My version of node is always v0.6.1-pre even after I install brew node and NVM install v0.6.19.

My node version is:

node -v
v0.6.1-pre

NVM says this (after I install a version of node for the first time in one bash terminal):

nvm ls
v0.6.19
current:    v0.6.19

But when I restart bash, this is what I see:

nvm ls
v0.6.19
current:    v0.6.1-pre
default -> 0.6.19 (-> v0.6.19)

So where is this phantom node 0.6.1-pre version and how can I get rid of it? I'm trying to install libraries via NPM so that I can work on a project.

I tried using BREW to update before NVM, using "brew update" and "brew install node". I've tried deleting the "node" directory in my /usr/local/include and the "node" and "node_modules" in my "/usr/local/lib". I've tried uninstalling npm and reinstalling it following these instructions.

All of this because I was trying to update an older version of node to install the "zipstream" library. Now there's folders in my users directory, and the node version STILL isn't up to date, even though NVM says it's using 0.6.19.

Ideally, I'd like to uninstall nodejs, npm, and nvm, and just reinstall the entire thing from scratch on my system.


Source: (StackOverflow)

ExpressJS How to structure an application?

I'm using the ExpressJS web framework for NodeJS.

People using ExpressJS put their environments (development, production, test ...), their routes ... on the app.js. I think that it's not a beautiful way because when you have a big application, app.js is too big !

I would like to have this structure directories :

| my-application
| -- app.js
| -- config/
     | -- environment.js
     | -- routes.js

Here my code :

app.js

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

require('./config/environment.js')(app, express);
require('./config/routes.js')(app);

app.listen(3000);

config/environment.js

module.exports = function(app, express){
    app.configure(function() {
    app.use(express.logger());
    });

    app.configure('development', function() {
    app.use(express.errorHandler({
        dumpExceptions: true,
        showStack: true
    }));
    });

    app.configure('production', function() {
    app.use(express.errorHandler());
    });
};

config/routes.js

module.exports = function(app) {
    app.get('/', function(req, res) {
    res.send('Hello world !');
    });
};

My code works well and I think that the structure of the directories is beautiful. However, the code had to be adapted and I'm not sure that it's good/beautiful.

Is it better to use my structure of directories and adapt the code or simply use one file (app.js) ?

Thanks for your advices !


Source: (StackOverflow)

How to store Node.js deployment settings/configuration files?

I have been working on a few Node apps, and I've been looking for a good pattern of storing deployment-related settings. In the Django world (where I come from), the common practise would be to have a settings.py file containing the standard settings (timezone, etc), and then a local_settings.py for deployment specific settings, ie. what database to talk to, what memcache socket, e-mail address for the admins and so on.

I have been looking for similar patterns for Node. Just a config file would be nice, so it does not have to be jammed in with everything else in app.js, but I find it important to have a way to have server-specific configuration in a file that is not in source control. The same app could well be deployed across different servers with wildly different settings, and having to deal with merge conflicts and all that is not my idea of fun.

So is there some kind of framework/tool for this, or does everyone just hack something together themselves?


Source: (StackOverflow)

Node.js Best Practice Exception Handling

I just started trying out node.js a few days ago. I've realized that the Node is terminated whenever I have an unhandled exception in my program. This is different than the normal server container that I have been exposed to where only the Worker Thread dies when unhandled exceptions occur and the container would still be able to receive the request. This raises a few questions:

  • Is process.on('uncaughtException') the only effective way to guard against it?
  • Will process.on('uncaughtException') catch the unhandled exception during execution of asynchronous processes as well?
  • Is there a module that is already built (such as sending email or writing to a file) that I could leverage in the case of uncaught exceptions?

I would appreciate any pointer/article that would show me the common best practices for handling uncaught exceptions in node.js


Source: (StackOverflow)

Using node.js as a simple web server

I want to run a very simple HTTP server. Every GET request to example.com should get index.html served to it but as a regular HTML page (i.e., same experience as when you read normal web pages).

Using the code below, I can read the content of index.html. How do I serve index.html as a regular web page?

var http = require('http');
var fs = require('fs');
var index = fs.readFileSync('index.html');

http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end(index);
}).listen(9615);

One suggestion below is complicated and requires me to write a get line for each resource (CSS, JavaScript, images) file I want to use.

How can I serve a single HTML page with some images, CSS and JavaScript?


Source: (StackOverflow)

Node.js + Nginx - What now?

I've set up Node.js and Nginx on my server. Now I want to use it, but, before I start there are 2 questions:

  1. How should they work together? How should I handle the requests?
  2. There are 2 concepts for a Node.js server, which one is better:

    a. Create a separate HTTP server for each website that needs it. Then load all JavaScript code at the start of the program, so the code is interpreted once.

    b. Create one single Node.js server which handles all Node.js requests. This reads the requested files and evals their contents. So the files are interpreted on each request, but the server logic is much simpler.

It's not clear for me how to use Node.js correctly.


Source: (StackOverflow)

Find the version of an installed npm package

How to find the version of an installed node.js/npm package?

This prints the version of npm itself:

npm -v <package-name>

This prints a cryptic error:

npm version <package-name>

This prints the package version on the registry (i.e. the latest version available):

npm view <package-name> version

How do I get the installed version?


Source: (StackOverflow)