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I've installed some packages via npm install $package, without setting up a package.json first.
Now I would like to create a package.json file, but keep all installed packages as dependencies.
Simply running npm init doesn't offer this option, can I achieve this automatically?
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To add dependencies and devDependencies to a package. json file from the command line, you can install them in the root directory of your package using the --save-prod flag for dependencies (the default behavior of npm install ) or the --save-dev flag for devDependencies.
json file in the dependency section. If you are using a recent version of npm save yourself from unnecessary typing and use npm install [Package Name] instead of npm install [Package Name] --save by default it will add the installed package to the dependency list in the package.
You don't need --save anymore for NPM installs. This was long the golden standard to install a package and save it as a dependency in your project. Meaning if we didn't specify the --save flag, it would only get locally installed and not added to the package.
When we run the npm install package_name command, then the package name is added in the package. json file as a dependency. The --save specifies that the package is required at production or development.
Update January 2016
npm now supports this out of the box. I have npm version 3.5.2.
so with just a node_modules folder with underscore installed.
npm init --yes then:
cat package.json Contained within package.json:
"dependencies": { "underscore": "^1.8.3" }, UPDATE: With the launch of npm v3, this trick will create a lot of unwanted entries on your package.json file. That's because module dependencies are now flattened, as @sunny-mittal pointed out.
npm doesn't support that, as far as I know. You'd have do reinstall each package passing --save to each one.
But, there's a workaround, if your're on Unix based systems. From inside your project root folder, with a package.json file already created (npm init, as you mentioned), run:
npm install $(ls node_modules/) --save and it will reinstall the packages, and save them into package.json as dependencies.
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Since NPM node_modules is flat now and @Rodrigo's answere don't deal to well with that.
This is what I knitted together.
npm list --depth=0 | sed "1d" | sed -E "s/^[\`+-]+\s//" | sed -E "s/@(.*)$//"
This is essentially what ls node_modules did before.
One-liner to save installed.
npm install $(npm ls | sed "1d" | sed -E "s/^[\`+-]+\s//" | sed -E "s/@(.*)$//") --save
I'm using
$ npm --version
3.5.3
Which lists like this.
$ npm list --depth=0
[email protected] /home/victor/x
+-- [email protected]
+-- [email protected]
+-- [email protected]
+-- [email protected]
`-- [email protected]
I wrote a module called pkg-save.
You can have a try if your npm version is "2.x.x".
I haven't test in npm v3, so I don't know whether it is useful or not in npm v3.
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