NodeJS和文件package.json

Question

I'm just approaching node-js, I wanted to know what the difference is between the files

package.json
package-lock.json

Finally I wanted to know if it exists in addition to the command nmp install to install the various dependencies a command to make the build / dist to be able to deploy on other machines

a command similar to maven install that creates the .jar file of my Java application.

Thanks

Answer 1

The basic part of Node Package Management (NPM) is Command Line Interface (CLI) that work in all situation.

A)

A Node.js base project initialize when

 $ npm init

In this moment package.json generated automatically with minimized key/value data. some feature like name, version, keywords, description

B)

If you need any dependency for inject in project, with command line

$ npm install --save express

add it to local node_module folder.

Notice: in

--save

flag dependency install locally.

C)

All dependency that store in your node_modules indexed in package-lock.json file that shows available package in node_modules .

In fact package-lock.json containe more detaile like:

• resolved: the source of library URL like https://registry.npmjs.org/@sailshq/connect-redis/-/connect-redis-3.2.1.tgz

• requires: all dependency that install for this package.

• integrity: hashed data