error installing coffeescript on mac 10.7.2 - macos

Question

Node and npm are both installed and up to date but keep getting this error when trying to install coffeescript. I am still new to programming so any advice would be greatly appreciated.
test-macbook:~ Test$ npm -v
1.1.0-3
test-macbook:~ Test$ node -v
v0.6.8
test-macbook:~ Test$ npm install -g coffee-script
npm http GET https://registry.npmjs.org/coffee-script
npm http 304 https://registry.npmjs.org/coffee-script
npm ERR! Could not create /usr/local/lib/node_modules/___coffee-script.npm
npm ERR! error installing coffee-script#1.2.0
npm ERR! Error: EACCES, permission denied '/usr/local/lib/node_modules/___coffee-script.npm'
npm ERR!
npm ERR! Please try running this command again as root/Administrator.
npm ERR!
npm ERR! System Darwin 11.2.0
npm ERR! command "node" "/usr/local/bin/npm" "install" "-g" "coffee-script"
npm ERR! cwd /Users/Dylan
npm ERR! node -v v0.6.8
npm ERR! npm -v 1.1.0-3
npm ERR! path /usr/local/lib/node_modules/___coffee-script.npm
npm ERR! code EACCES
npm ERR! message EACCES, permission denied '/usr/local/lib/node_modules/___coffee-script.npm'
npm ERR! errno {}
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR! /Users/Dylan/npm-debug.log
npm not ok

Answer 1

Following the advice of nmp author Isaac Z. Schlueter:
I strongly encourage you not to do package management with sudo!
Instead of sudo npm install ... you could instead change permissions on your /usr/local directory:
sudo chown -R $USER /usr/local
After doing this once, you should be able to npm install ... (without sudo).

Answer 2

I realize this is an older thread, but I just ran across this and wanted to update the last answer.
Changing the owner of the entire /usr/local directory is a horrible answer to this question. There's no reason at all that you should do that.
If you look at the error message from npm, it's being denied write permissions on /usr/local/lib/node_modules/ I know that after installing node and npm on OS X Mavericks, its default owner is a non-existent user.
0 drwxr-xr-x 3 24561 wheel 102 Jan 23 14:17 node_modules
If you're just running node/npm on your local development machine, just change the owner of the node_modules folder to your user:
sudo chown -R yourusername /usr/local/lib/node_modules
Then you can install modules with npm without sudo and without changing the owner of /usr/lib from root, as it should be.

Answer 3

The error message is fairly clear:
npm ERR! Error: EACCES, permission denied '/usr/local/lib/node_modules/___coffee-script.npm'
npm ERR!
npm ERR! Please try running this command again as root/Administrator.
You can't install it in /usr/local/lib/node_modules because you don't have the necessary permissions. Try using sudo:
dylan-hermans-macbook:~ sudo npm install -g coffee-script
The npm author recommends not using sudo because packages can run arbitrary commands so sudo npm install is dangerous. He suggests switching the ownership of /usr/local to your user. I think that's horribly advice that just gives you a false sense of security: if a package can run arbitrary commands then it can mess with your home directory (including all your personal data, executables, config and startup files, ...) regardless of sudo or who owns /usr/local so not using sudo really doesn't do much for you. If you don't trust a package then don't install it; if you don't trust a package then how can you even use it? The /usr/local tree is still a system directory tree and OSX is still a multi-user operating system.
IMO a much better solution is twofold:
Don't install or use any packages that you don't trust. If you install it then you're trusting that code to be you (unless you're always going to run it in a jail of some sort but if you're going to those lengths you're probably better off writing the code yourself).
Leave sudo and /usr/local alone and install it all inside your home directory. You'll be subject to most of the same dangers as using sudo or changing the /usr/local ownership but at least you won't be picking up bad habits.