Step 1: Setup

How to set up the Raspberry Pi?

If you download and install 'Raspbian Stretch with desktop and recommended software' on your Pi, Node-RED is already installed.

You can see how to start it at the end of the tutorial.

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Step 2: Check for Updates

Type in this command to check for updates:

sudo apt-get update

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Step 3: Download and Install NodeJS

First you have to find out which version of NodeJS you need. Type in this command to find out:

uname -m

If the response starts with armv6, then you will need the ARMv6 version. Otherwise, if it starts with armv7, you will need the ARMv7 version.

1. Copy the link of the version you need from the NodeJS website
2. Paste it after you type 'wget' in the console of your Pi
3. 
   wget [YOUR_NODEJS_DOWNLOAD_LINK]
   eg. wget https://nodejs.org/dist/v10.16.0/node-v10.16.0-linux-armv7l.tar.xz
4. Press enter. NodeJS will now download
5. After the download finished, extract the file
   tar xf [YOUR_DOWNLOADED_NODEJS_FILE]
   e.g. tar xf node-v10.16.0-linux-armv7l.tar.xz
6. Navigate into the extracted directory
   cd [YOUR_EXTRACTED_DIRECTORY]
   e.g. cd node-v10.16.0-linux-armv7l
7. Copy all files to '/usr/local/'
   sudo cp -R * /usr/local

Check if everything has installed successfully:

node -v

npm -v

Those commands should now return the version of node and npm. If they don't do that, you have probably downloaded the wrong NodeJS version.

Step 4: Install and Start Node-RED

Install Node-RED via the Node Package Manager:

sudo npm install -g --unsafe-perm node-red

After Node-RED has installed, you can start it with this command:

node-red

The response should be something like this:

Welcome to Node-RED

===================25 Mar 22:51:09 - [info] Node-RED version: v0.20.5

25 Mar 22:51:09 - [info] Node.js  version: v10.15.3

25 Mar 22:51:09 - [info] Loading palette nodes

25 Mar 22:51:10 - [warn] ------------------------------------------

25 Mar 22:51:10 - [warn] [rpi-gpio] Info : Ignoring Raspberry Pi specific node

25 Mar 22:51:10 - [warn] ------------------------------------------

25 Mar 22:51:10 - [info] Settings file  : /home/nol/.node-red/settings.js

25 Mar 22:51:10 - [info] Context store  : 'default' [module=localfilesystem]

25 Mar 22:51:10 - [info] User Directory : /home/nol/.node-red

25 Mar 22:51:10 - [warn] Projects disabled : set editorTheme.projects.enabled=true to enable

25 Mar 22:51:10 - [info] Server now running at  http://127.0.0.1:1880/

25 Mar 22:51:10 - [info] Creating new flows file : flows_noltop.json

25 Mar 22:51:10 - [info] Starting flows

25 Mar 22:51:10 - [info] Started flows

The address of the server will be displayed in the response. (it's bold in this sample response)

Node-RED is now available at: http://[IP_OF_YOUR_PI]:1880/

You have now successfully installed Node-RED on your Raspberry Pi!