Error: Cannot find module 'webpack'

Question

Link globally installed package to your project:

npm link webpack

Checkout the official documentation of yarn link.

While working on windows, I've installed webpack locally and it fixed my problem

So, on your command prompt, go to the directory of which you want to run webpack, install webpack locally (without the -g) and enjoy...

I solved the same problem by reinstalling, execute these commands

rm -Rf node_modules
rm -f package-lock.json
npm install

rmis always a dangerous command, especially with -f, please notice that before executing it!!!!!

Run below commands in Terminal:

npm install --save-dev webpack

npm install --save-dev webpack-dev-server

Seems to be a common Windows problem. This fixed it for me:

Nodejs cannot find installed module on Windows?

"Add an environment variable called NODE_PATH and set it to %USERPROFILE%\Application Data\npm\node_modules (Windows XP), %AppData%\npm\node_modules (Windows 7), or wherever npm ends up installing the modules on your Windows flavor. To be done with it once and for all, add this as a System variable in the Advanced tab of the System Properties dialog (run control.exe sysdm.cpl,System,3)."

Note that you can't actually use another environment variable within the value of NODE_PATH. That is, don't just copy and paste that string above, but set it to an actual resolved path like C:\Users\MYNAME\AppData\Roaming\npm\node_modules

I was having this issue on OS X and it seemed to be caused by a version mismatch between my globally installed webpack and my locally installed webpack-dev-server. Updating both to the latest version got rid of the issue.

Installing both webpack and CLI globally worked for me.

npm i -g webpack webpack-cli