Hello, just FYI.
While going through NPM challenge #1 on repl.it I received the following error which prevented compilation:
Error: Cannot find module ‘express’
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)`
What fixed it for me was to manually launch “npm install express” in the shell.
I am reporting it in case the challenge repl repository needs attention from the mods.