'Express' is not recognized command (windows)

Try:

npm install -g express-generator@3

That solved problem for me.

Edit: for version 4

npm install express-generator -g

Description: express is the package for dependency of express js. express-generator is the package for enabeling express command and create a sample project, etc. Assuming that this is kept separate for the decoupling of project dependency with cli tool of express.

Another SO ref: https://stackoverflow.com/a/41311733/1666582

Here's what to type in the command line to make it work in windows:

npm install express-generator -g

[Source: http://expressjs.com/starter/generator.html]