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Installation
Node should install out of the box on Linux, Macintosh, and Solaris.
With some effort you should be able to get it running on other Unix platforms and Windows (either via Cygwin or MinGW).
Node has several dependencies, but fortunately most of them are distributed along with it. If you are building from source you should only need 2 things.
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python - version 2.4 or higher. The build tools distributed with Node run on python.
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libssl-dev - If you plan to use SSL/TLS encryption in your networking, you'll need this. Libssl is the library used in the openssl tool. On Linux and Unix systems it can usually be installed with your favorite package manager. The lib comes pre- installed on OS X.
Building from source
Use make to build and install Node (execute the following on the command line)
export JOBS=2 # optional, sets number of parallel commands.
mkdir ~/local
./configure --prefix=$HOME/local/node
make
make install
export PATH=$HOME/local/node/bin:$PATH
If you have any installation problems, look at Troubleshooting Installation.
Pre-built binaries
You can also install node from packages: Installing Node.js via package manager
Building from source
There are two ways of building Node on Windows. One is over the Cygwin emulation layer the other is using MinGW (GNU toolchain for windows). See the Cygwin and MinGW pages.
Neither builds are satisfactorily stable but it is possible to get something running.
NPM is a package manager that has become the de-facto standard for installing additional node libraries and programs. Here's the quick and easy one-liner for installing on Unix.
$ curl http://npmjs.org/install.sh | sudo sh
To install a library e.g. Express:
$ npm install express
And visit https://github.com/isaacs/npm for details.