nodemon

npm i nodemon -D

nodemon.json

{
  "restartable": "rs",
  "ignore": [".git", "node_modules/**/*", ".vscode/**/*", "./dist/**/*"],
  "verbose": true,
  "watch": ["./app"],
  "env": {
    "NODE_ENV": "development"
  },
  "ext": "js,json"
}

Refer

• nodemon.json