使用npm节点控制台或package.json安装模块有什么区别

Question

I'm new and I need to use node for off-line use so, I'm trying to understand how the install modules work.

It's the same if I use npm install express or included it in the package.json ?

Answer 1

The way a package is installed will be the same whether you manually type npm install express or put it in your package.json and then do npm install . The difference comes when you try to install your Node project elsewhere.

For example, if your code was checked into GitHub and you didn't include a package.json with all of the dependencies listed, then when the project was downloaded you would have to manually re-install all of the dependencies on the command line in order for it to work. But if you had checked in a package.json with the code, then you could run npm install to install all of the dependencies at once, and not have to remember which ones were necessary.

In addition, the package.json allows you to specify an "approximate version" of a dependency to use. This way if a few packages in your project share a dependency and they all specify similar "approximate versions", only one version will be installed and it will be shared between packages. This saves some install time.

Answer 2

Nothing actually. But you don't want to do that again and again. So you might as well put your module dependencies in your package.json