aws-lambda Cannot find module

Question

I keep getting this error in the aws-lambda console when uploading code from a zip file. I have tried uploading other zip files and they work correctly. The .js file is name

Answer 1

I had this problem on a custom module I had built that was in the node_modules dir. Everything ran fine in testing on my Win10 machine, but when uploaded I kept getting that same "Cannot find module 'modulename'" error.

It turns out that I had a mismatch; here's the package.json line from the module that couldn't be found:

"main": "./build/modulename.js",

and here's the actual filename:

Modulename.js

Case-sensitive; Windows isn't, linux (and thus AWS) is.