express-app-launch.json

{
  "version": "0.2.0",
  "configurations": [
    {
      "type": "pwa-node",
      "name": "Attach to existing process",
      "skipFiles": ["<node_internals>/**"],
      "request": "attach",
      "restart": true,
      "port": 9229
    },
    {
      "type": "pwa-node",
      "request": "launch",
      "name": "Launch Program",
      "skipFiles": ["<node_internals>/**"],
      "program": "${workspaceFolder}/bin/www"
    }
  ]
}

launch.json

{
  "version": "0.2.0",
  "configurations": [
    {
      "type": "node",
      "request": "attach",
      "autoAttachChildProcesses": true,
      "name": "9229",
      "cwd": "${workspaceFolder}",
      "port": 9229,
      "protocol": "auto"
    }
  ]
}