npm upgrade & package version check, npm init package.json generation

Microsoft Windows [Version 10.0.19044.1348]
(c) Microsoft Corporation. All rights reserved.

C:\Windows\system32>npm -v
6.14.15

C:\Windows\system32>npm i -g npm
C:\Users\ROOKIE\AppData\Roaming\npm\npm -> C:\Users\ROOKIE\AppData\Roaming\npm\node_modules\npm\bin\npm-cli.js
C:\Users\ROOKIE\AppData\Roaming\npm\npx -> C:\Users\ROOKIE\AppData\Roaming\npm\node_modules\npm\bin\npx-cli.js
+ npm@8.3.0
added 214 packages from 96 contributors in 9.423s

C:\Windows\system32>npm -v
8.3.0

C:\Windows\system32>npm show react-router-dom

react-router-dom@6.1.1 | MIT | deps: 2 | versions: 62
Declarative routing for React web applications
https://github.com/remix-run/react-router#readme

keywords: react, router, route, routing, history, link

dist
.tarball: https://registry.npmjs.org/react-router-dom/-/react-router-dom-6.1.1.tgz
.shasum: ed59376ff9115bc49227e87982a32e91e9530ca3
.integrity: sha512-O3UH89DI4o+swd2q6lF4dSmpuNCxwkUXcj0zAFcVc1H+YoPE6T7uwoFMX0ws1pUvCY8lYDucFpOqCCdal6VFzg==
.unpackedSize: 165.8 kB

dependencies:
history: ^5.1.0     react-router: 6.1.1

maintainers:
- timdorr <timdorr@timdorr.com>
- mjackson <npm@mjackson.me>
- chancestrickland <hi@chance.dev>

dist-tags:
latest: 6.1.1       next: 6.0.0-beta.8

published yesterday by mjackson <npm@mjackson.me>

C:\Windows\system32>

project 디렉토리를 생성하고 안에서 npm init를 실행하면 package.json을 생성할 수 있다.

처음 알았다.ㅎㅎ처음이니까.