EDIT The issue concerning the compilation of npm for ARM seems to have been fixed, which would outdate this post. The latest builds should be available at https://nodejs.org/dist/. For RPi 1 look for the builds with "armv6l", for RPi2B "armv7l", and for RPi3 I assume you would need "arm64".
Although it's relatively easy to install Node.js on a Raspberry Pi, getting npm to work is a bit more challenging.
It seems there is an issue with compiling npm, at least for ARM. As long as this remains unfixed, there is no npm with the node 0.12.x ARM installation.
A very simple workaround is to copy the node_modules from another system and to run the packages (e.g. bunyan, which is supposed to be installed globally) with node. Since installing (globally or not) is not possible, but node is installed, I will call it directly from the node_modules that I copied from another machine.
So instead of using npm start configured in package.json as node app.js | bunyan I would do node app.js | node node_modules/bunyan/bin/bunyan
Or if I would like to read the log file afterwards:
node node_modules/bunyan/bin/bunyan -o short error.log
This would also work for other systems where npm can't be installed or if npm can't be used to install packages. I've used this on a system behind a corporate proxy, although I've found a better way by now.
Keep in mind that this still requires Node.js to be installed. For a Raspberry Pi running Raspbmc it's possible to use apt-get to install Node, but it won't be a recent version. Instead, I use the ARM build node_latest_armhf.deb from node-arm.
I've also tried compiling Node from source on the Raspberry Pi (model B). It should not be very difficult, but it failed in my case, probably because of the issue with npm, mentioned before. To be complete, I will list my steps.
sudo apt-get install build-essential# adapted from http://elinux.org/Node.js_on_RPi
wget http://nodejs.org/dist/v0.12.7/node-v0.12.7.tar.gz
tar -xzf node-v0.12.7.tar.gz # duration ca. 1 min
cd node-v0.12.7
./configure # duration ca. 1 min
Here I would really recommend to start a screen session, because compiling takes ca. 2 hours.
sudo apt-get install screenscreen start a sessionctrl + a, d detach sessionscreen -dRR reattach to any session runningMy first attempt to run make ended with this error:
/usr/include/linux/sysinfo.h:8:2: error: unknown type name '__kernel_long_t'`
From this thread I found the solution to add these lines:
#ifndef __kernel_long_t
typedef long __kernel_long_t;
typedef unsigned long __kernel_ulong_t;
#endif
to the file /usr/include/linux/sysinfo.h, before the lines:
#define SI_LOAD_SHIFT 16struct sysinfo {...
The second attempt to run make failed with this error:
/bin/sh: 1: cannot create /home/pi/node-v0.12.7/out/Release/.deps//home/pi/node-v0.12.7/out/Release/obj.target/libuv/deps/uv/src/unix/linux-core.o.d: Permission denied
So in the end I ran clean and make as root:
sudo make cleansudo makeafter some hours it fails with:
/out/Release/obj.target/v8_snapshot/geni/snapshot.cc"
Illegal instruction
make[1]: *** [/home/pi/node-v0.12.7/out/Release/obj.target/v8_snapshot/geni/snapshot.cc] Error 132
make[1]: Leaving directory `/home/pi/node-v0.12.7/out'
make: *** [node] Error 2
This is either the compile issue as described in the beginning of this article, or yet again another issue. Since I found out about the compile issue at this point I've stopped experimenting and resorted to the quick workaround.