Nodejs and npm

Hi all,
is anybody using nodejs and npm on OpenWRT?
My router is an D-Link DIR-860L that I like very much.
Now I need to run a node project on it, but had no success.
I have tried it first with the last versoin 19. There is no node, nor npm package.
Then I tried version 18, with same result.
With LEDE and version 15, there is a node package, but nor npm. I assume npm is embedded.
Running node -v after installation with success, shows an version.
But npm -v gives "Illegal instruction".
Is there a compilation error?
Why was node not compiled on version 18 and 19?
Thanks in advance.