can't debug my react app vscode code example

Example 1: how to create react app in vs code

npx create-react-app my-app

Example 2: Configure the Chrome debugger react

{
  "version": "0.2.0",
  "configurations": [
    {
      "type": "chrome",
      "request": "launch",
      "name": "Launch Chrome against localhost",
      "url": "http://localhost:3000",
      "webRoot": "${workspaceFolder}"
    }
  ]
}