Waiting for debugger to disconnect… – Node.js in VSCode

click on the button as shown below to open launch.json-

Give your correct file name here, where your server is starting. In my case it is app.js

"version": "0.2.0",
"configurations": [
    {
        "type": "node",
        "runtimeVersion": "10.21.0", 
        "request": "launch",
        "name": "Launch Program",
        "program": "${workspaceFolder}/app.js"
    }
]

runtimeVersion is optional, its required if you want to run it on a specific node version.And that node version should be installed on your system.