What is the --save option for npm install?

问题:

I saw some tutorial where the command was:

npm install --save

What does the --save option mean?

Not able to find the answer on Google.

回答1:

Update npm 5:

As of npm 5.0.0, installed modules are added as a dependency by default, so the --save option is no longer needed. The other save options still exist and are listed in the documentation for npm install.

Original answer:

Before version 5, NPM simply installed a package under node_modules by default. When you were trying to install dependencies for your app/module, you would need to first install them, and then add them (along with the appropriate version number) to the dependencies section of your package.json.

The --save option instructed NPM to include the package inside of the dependencies section of your package.json automatically, thus saving you an additional step.

In addition, there are the complementary options --save-dev and --save-optional which save the package under devDependencies and optionalDependencies, respectively. This is useful when installing development-only packages, like grunt or your testing library.

回答2:

To add package in dependencies:

npm install my_dep --save

or

npm install my_dep -S

To add package in devDependencies

npm install my_test_framework --save-dev

or

npm install my_test_framework -D

package.json

回答3:

It won\'t do anything if you don\'t have a package.json file. Start by running npm init to create one. Then calls to npm install --save or npm install --save-dev or npm install --save-optional will update the package.json to list your dependencies.

回答4:

according to NPM Doc

So it seems that by running npm install package_name, the package dependency should be automatically added to package.json right?

回答5:

You can also use -S, -D or -P which are equivalent of saving the package to an app dependency, a dev dependency or prod dependency. See more NPM shortcuts below:

-v: --version
-h, -?, --help, -H: --usage
-s, --silent: --loglevel silent
-q, --quiet: --loglevel warn
-d: --loglevel info
-dd, --verbose: --loglevel verbose
-ddd: --loglevel silly
-g: --global
-C: --prefix
-l: --long
-m: --message
-p, --porcelain: --parseable
-reg: --registry
-f: --force
-desc: --description
-S: --save
-P: --save-prod
-D: --save-dev
-O: --save-optional
-B: --save-bundle
-E: --save-exact
-y: --yes
-n: --yes false
ll and la commands: ls --long

This list of shortcuts can be obtained by running the following command:

$ npm help 7 config

回答6:

As of npm 5, npm will now save by default. In case,if you would like npm to work in a similar old fashion (no autosave) to how it was working in previous versions, you can update the config option to enable autosave as below.

npm config set save false

To get the current setting, you can execute the following command:

npm config get save

Source:https://blog.pusher.com/what-you-need-know-npm-5/

回答7:

npm install package_x --save

The given package (package_x) will be saved in package.json inside dependencies. if you add

npm install <> --save-dev

then it will be saved inside \"devDependencies\".

回答8:

As of npm 5, it is more favorable to use --save-prod (or -P) than --save but doing the same thing, as is stated in npm install. So far, --save still works if provided.

回答9:

The easier (and more awesome) way to add dependencies to your package.json is to do so from the command line, flagging the npm install command with either --save or --save-dev, depending on how you\'d like to use that dependency.

回答10:

npm i (Package name) --save

Simplily, using above command we ll not need to write package name in your package.json file it ll auto add its name and dependency with version that you ll need at time when you go for production or setup another time.

npm help install

Above command ll help find out more option and correct def.shown in pic

回答11:

npm install --save or npm install --save-dev why we choose 1 options between this two while installing package in our project.

things is clear from the above answers that npm install --save will add entry in the dependency field in pacakage.json file and other one in dev-dependency.

So question arises why we need entry of our installing module in pacakge.json file because whenever we check-in code in git or giving our code to some one we always give it or check it without node-modules because it is very large in size and also available at common place so to avoid this we do that.

so then how other person will get all the modules that is specifically or needed for that project so answers is from the package.json file that have the entry of all the required packages for running or developing that project.

so after getting the code we simply need to run the npm install command it will read the package.json file and install the necessary required packages.