node
✨Future Node.js releases will be from this repo. ✨
I've been trying to find a way to write to a file when using Node.js, but with no success. How can I do that?
Source: (StackOverflow)
I am new to this kind of stuff, but lately I've been hearing a lot about how good Node.js is. Considering how much I love working with jQuery and JavaScript in general, I can't help but wonder how to decide when to use Node.js. The web application I have in mind is something like Bitly - takes some content, archives it.
From all the homework I have been doing in the last few days, I obtained the following information. Node.js
- is a command-line tool that can be run as a regular web server and lets one run JavaScript programs
- utilizes the great V8 JavaScript engine
- is very good when you need to do several things at the same time
- is event-based so all the wonderful Ajax-like stuff can be done on the server side
- lets us share code between the browser and the backend
- lets us talk with MySQL
Some of the sources that I have come across are:
Considering that Node.js can be run almost out-of-the-box on Amazon's EC2 instances, I am trying to understand what type of problems require Node.js as opposed to any of the mighty kings out there like PHP, Python and Ruby. I understand that it really depends on the expertise one has on a language, but my question falls more into the general category of: When to use a particular framework and what type of problems is it particularly suited for?
Source: (StackOverflow)
What is the purpose of Node.js module.exports and how do you use it?
I can't seem to find any information on this, but it appears to be a rather important part of Node.js as I often see it in source code.
According to the Node.js documentation:
module
A reference to the current
module. In particular module.exports
is the same as the exports object. See
src/node.js for more information.
But this doesn't really help.
What exactly does module.exports do, and what would a simple example be?
Source: (StackOverflow)
I just installed node and npm through the package on nodejs.org and whenever I try to search or install something with npm it throws the following error, unless I sudo the command. I have a feeling this is a permissions issue? I am already the admin.
npm ERR! Error: EACCES, open '/Users/chietala/.npm/-/all/.cache.json'
npm ERR! { [Error: EACCES, open '/Users/chietala/.npm/-/all/.cache.json']
npm ERR! errno: 3,
npm ERR! code: 'EACCES',
npm ERR! path: '/Users/chietala/.npm/-/all/.cache.json' }
npm ERR!
npm ERR! Please try running this command again as root/Administrator.
npm ERR! System Darwin 12.2.0
npm ERR! command "node" "/usr/local/bin/npm" "search" "bower"
npm ERR! cwd /Users/chietala
npm ERR! node -v v0.10.4
npm ERR! npm -v 1.2.18
npm ERR! path /Users/chietala/.npm/-/all/.cache.json
npm ERR! code EACCES
npm ERR! errno 3
npm ERR! stack Error: EACCES, open '/Users/chietala/.npm/-/all/.cache.json'
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR! /Users/chietala/npm-debug.log
npm ERR! not ok code 0
Source: (StackOverflow)
Despite knowing JavaScript quite well, I'm confused what exactly these three projects in Node.js ecosystem do. Is it something like Rails' Rack? Can someone please explain?
Source: (StackOverflow)
After I upgraded to latest stable node and npm, I tried npm install moment --save. It saves the entry in the package.json with the caret(^) prefix. Previously, it was a tilde(~) prefix.
- Why are these changes made in npm?
- What is the difference between tilde(~) and caret(^)?
- What is the advantages over others?
Source: (StackOverflow)
How should I parse JSON using Node.js? Is there some module which will validate and parse JSON securely?
Source: (StackOverflow)
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)
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:
- How should they work together? How should I handle the requests?
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)
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)
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)
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)