vsc an error occurred while attaching debugger to the application code example

Example 1: why always appear errors in vscode while importing the library

{
  "version": "0.2.0",
  "configurations": [
    {
      "type": "node",
      "request": "launch",
      "name": "Launch Program",
      "program": "./app.js"
    }
  ]
}

Example 2: vs code terminal json object not showing something shows [object]

console.log(JSON.stringify(myObject, null, 4));