Debugging nest.js application with vscode

I tried the accepted answer and all the other variances and none worked for me, however what really works for me is to attach to the 9229 port. What I did is add/modify your launch.json with the following config

.vscode/launch.json

{
  // Use IntelliSense to learn about possible attributes.
  // Hover to view descriptions of existing attributes.
  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
  "version": "0.2.0",
  "configurations": [
    {
      "type": "node",
      "request": "attach",
      "name": "Attach NestJS WS",
      "port": 9229,
      "restart": true,
      "stopOnEntry": false,
      "protocol": "inspector"
    }
  ]
}

and in package.json (Nest new CLI commands, requires 6.8.x and higher, see this blog)

{
  "name": "nest-app",
  "scripts": {
    "start:debug": "nest start --debug --watch"
  }
}

and finally it works!

Try this launch.json:

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "request": "launch",
            "name": "Debug Nest Framework",
            "args": ["${workspaceFolder}/src/main.ts"],
            "runtimeArgs": ["--nolazy", "-r", "ts-node/register"],
            "sourceMaps": true,
            "cwd": "${workspaceRoot}",
            "protocol": "inspector"
        }
    ]
}