How to run a ReactJS application at startup on Beaglebone?

My main computer is running Ubuntu 18,04, I developed an application on ReactJS on FrontEnd, NodeJS on BackEnd and MySQL concerning the database ON beaglebone. .

More information about my BeagleBone :

 root@beaglebone:~# uname -a
Linux beaglebone 3.8.13-bone71.1 #162 SMP Fri Oct 16 07:27:34 CST 2015 armv7l GNU/Linux

I want to run my application always at startup on BeagleBone

What can I do to make a script run as soon as it boots up ?

Short answer: Just like on any other device (including PC or Server) that runs a Linux distribution.

Some quick pointers:

• Latest BeagleBone Images are Debian 9.4 based
• Use an "IoT" image unless you really need the HDMI (or LCD) output and accept the lower performance.
• Debian uses systemd to manage automatic starting and stopping of software services
• Create a systemd service file that invokes a process you need (e.g. npm) as the desired user (probably 'debian'). There seem to be helper tools like service-systemd
• reload systemd systemctl daemon-reload to make it aware of the new file
• enable it systemctl enable myfancy.service
• Both flavours of mySQL on Debian (mysql-server and mariadb-server) come with a systemd file already.