Hanpan Hanpan - 2 months ago 18
Node.js Question

How do I import global modules in Node? I get "Error: Cannot find module <module>"?

I am trying to setup Node on Mac OSX Lion. It all seems to work ok, but I can't seem to import anything modules from my global modules folder. I get the error,

Error: Cannot find module <module>


If I run this:
node -e require.paths
, the response I get is:

[ '/usr/local/lib/node_modules',
'/Users/Me/.node_modules',
'/Users/Me/.node_libraries',
'/usr/local/Cellar/node/0.4.12/lib/node' ]


Which is correct, my modules are indeed installed in /usr/local/lib/node_modules. When I try and run a script, however, I am getting this:

Error: Cannot find module 'socket.io'
at Function._resolveFilename (module.js:326:11)
at Function._load (module.js:271:25)
at require (module.js:355:19)
at Object.<anonymous> (/Users/Me/node/server.js:2:10)
at Module._compile (module.js:411:26)
at Object..js (module.js:417:10)
at Module.load (module.js:343:31)
at Function._load (module.js:302:12)
at Array.<anonymous> (module.js:430:10)
at EventEmitter._tickCallback (node.js:126:26)


My .bash_profile looks like this:

export PATH=/usr/local/mysql/bin:$PATH
export NODE_PATH=/usr/local/lib/node_modules
export DYLD_LIBRARY_PATH="$DYLD_LIBRARY_PATH:/usr/local/mysql/lib/"


Would really appreciate some help, I have no idea why I can't import any libraries.

Answer

If you're using npm >=1.0, you can use npm link <global-package> to create a local link to a package already installed globally. (Caveat: The OS must support symlinks.)

However, this doesn't come without its problems.

npm link is a development tool. It's awesome for managing packages on your local development box. But deploying with npm link is basically asking for problems, since it makes it super easy to update things without realizing it.

As an alternative, you can install the packages locally as well as globally.

For additional information, see