How to install dependencies from a past project into a new package.json?

Question

Node.js

I read that it's enough just to transfer the package.json to a new project and run the command

npm i

But I would like to understand this. To install dependencies from the previous project to the new one, in the previous project they had to be installed using

--save

or

--save-dev

or it does not play a role in any way and you can install packages simply

npm i name

?

Answer 1

There is no command, but --savethere is --save-prod(which is not needed, because by default).
--save-dev- obviously installs devDependencies.
Development dependencies go to devDependencies, dependencies for the application itself go to dependencies (by default). For local development, there is no difference (except for the organization) - they all fly in a bunch to node_modules, however, if you make your own ready-made module for npm, then when you install such a module, only the usual dependencies will be installed.

Answer 2

npm ithis is a short version npm install
Without parameters, it installs dependencies from package.json and if there is a package-lock.json file, it normalizes the node_modules folder according to it.
npm i namewill install the package name version tagged with latest (the default tag) will
npm i [email protected]install the package name version tagged with tag will
npm i [email protected]install the package name version 5.xx where xx is the last of 5 will
npm i [email protected]install the package name version 5.3.x where x is the last of 5.3 will
npm i [email protected]install the package name version 5.3 The .1
parameter --saveor its short version -Swill store the dependency in package.json in the dependencies section, this has been the default behavior for some time now when package.json is present
the parameter --save-devor its short version -Dwill save the dependency in package.json in the devDependencies section.
And only you can decide how to install in your particular case.