How to install only “devDependencies” using npm

Question

I am trying to install ONLY the \"devDependencies\" listed in my package.json file. But none of the following commands work as I expect. All of the following commands install th

Answer 1

Check the NPM docs for install:

With the --production flag (or when the NODE_ENV environment variable is set to production), npm will not install modules listed in devDependencies.

The --only={prod[uction]|dev[elopment]} argument will cause either only devDependencies or only non-devDependencies to be installed regardless of the NODE_ENV.

Have you tried the following?

npm install --only=dev

Answer 2

npm i -D

An optional short version.

Answer 3

Running npm install, It will install all dependencies under devDependencies` or dependencies.

For installing and save packages as dev dependencies in package.json, npm install package_name --save-dev or pass option -D

For installing all packages under devDependencies, npm install --only=dev

For installing and save packages as prod or only dependencies in package.json, npm install package_name --save-prod or pass option -P or npm install package_name

For installing all packages under dependencies or Prod dependencies, set Environment variable NODE_ENV=production or pass it with the command NODE_ENV=production npm install or npm install --only=prod

Instead of using install in npm command like npm install you can just use i like npm i, short of install.

Reference

Answer 4

npm install thePackageName --save-dev

This works fine for me.