## What I learned today

Personal blog about programming and all that stuff

Following the guide in my last post you can safely install NodeJS on a Raspberrry Pi. If you try this on a Raspberrry Pi Zero W, this will take a very long time, because it builds NodeJS from source and this device has a very limited CPU performance. Here is a better and faster solution.

The Raspberrry Pi Zero W features an ARM11 CPU, which is fairly slow, compared to the Raspberrry Pi 3B+ or Raspberrry Pi 4. This makes the device suitable for application, where the focus is on power consumption. But running CPU intensive tasks on the Pi Zero is not so much fun.

I recently described how to set up NodeJS on a RaspebrryPi using nvm. The disadvantage of that method is, that ist takes a huge amount of time when run on a Raspberrry Pi Zero.

## Here is a better solution

### Find out, what type of Raspberrry Pi you own

To determine the type of Raspberrry Pi you own, you need an ssh connection to the device. Open the SSH console to run the following command:

uname -a


With this command I can determine the CPU architecture. This way I find out for which architecture NodeJS must be built. Look for a string in the results that starts with armv. Example:

Linux raspberrypi 5.4.51+ #1333 Mon Aug 10 16:38:02 BST 2020 armv6l GNU/Linux


Here I executed this command on a Raspberrry Pi Zero W. The message tells me that this device’s CPU arcitecture is armv61. In this example I need to download NodeJS built for armv6l. (For Raspberrry Pi 3 or 4 you’ll get armv7l as the result).

The full archive of all releases of NodeJS can be found here. There you can look for the appropriate package for your machine. For the Raspberrry Pi Zero (remember: armv6l) the latest release of NodeJS is v11.15.0 (at the time of writing):

wget https://nodejs.org/dist/latest-v11.x/node-v11.15.0-linux-armv6l.tar.gz


Next extract the files:

tar -xzf node-v1.15.0-linux-armv6l.tar.gz


Copy to /usr/local:

sudo cp -R node-v11.15.0-linux-armv6l/* /usr/local/


To find out if everything went well, check the version of NodeJS:

node --version
v11.15.0


Success! Now clean up your home folder. You don’t need these files any longer.

rm -rf node-v*