こんだけ

$ docker run --rm -it node:lts bash

node@3f80fb74707d:~$ mkdir fuga
node@3f80fb74707d:~$ cd fuga
node@3f80fb74707d:~/fuga$ npm init -y
Wrote to /home/node/fuga/package.json:

{
  "name": "fuga",
  "version": "1.0.0",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "description": ""
}

node@3f80fb74707d:~/fuga$ ls -la
total 12
drwxr-xr-x 2 node node 4096 Sep  6 04:58 .
drwxr-xr-x 1 node node 4096 Sep  6 04:58 ..
-rw-r--r-- 1 node node  218 Sep  6 04:58 package.json

node@3f80fb74707d:~/fuga$ cat package.json
{
  "name": "fuga",
  "version": "1.0.0",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "description": ""
}