I’ll introduce the solution when the atom-ternjs package installed in Atom shows the error Failed to find plugin node-express.

The solution is written in Third party plugins - atom-ternjs:

$ cd ~/.atom/packages/atom-ternjs
$ npm install tern-node-express

This will install the third-party plugin tern-node-express.

If this isn’t your first installation, the tern-node-express plugin probably wasn’t installed due to an atom-ternjs update or something similar, so install it as needed.

That’s all from the Gemba.