'NODE_ENV' is not recognized as an internal or external command

I have an app which is working perfectly on linux but when I execute it on windows I get this error.

'NODE_ENV' is not recognized as an internal or external command,
operable program or batch file.

'NODE_ENV' is not recognized as an internal or external command,operable program or batch file.

npm
 ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! aaa@1.0.0 webpack-watch: `NODE_ENV='debug' webpack --progress -d -colors --watch`
npm ERR! Exit status 1
npm ERR!

I have tried this in cmd.

SET NODE_ENV=debug

which I found here “NODE_ENV” is not recognized as an internal or external command

And here is snippet of code package.json where I guess is my mistake.

"webpack-watch": "NODE_ENV='debug' webpack --progress -d --colors --watch",
"server-watch": "NODE_ENV='debug' nodemon backend/server.js"

via Armen Sanoyan