See the magic happening

If you open a javascript file with some errors/problems you will see some underlines.

To fix that you can add this script to your package.json:

package.json

...
"scripts": {
   "lint": "eslint ./"
   ...
},
...

Now run the command: npm run lint and you will all the problems listed in the terminal.

Autofix on save

To autofix some problems on save create a new file in your root directory like this:

.vscode/settings.json

{
  "editor.codeActionsOnSave": {
    "source.fixAll.eslint": true
  },
  "eslint.validate": ["javascript", "javascriptreact"],
}

Now save your file and you will see the magic