How to run node.js and angular2+ at the same time

I have node.js project with Angular4CLI in folder "UI"

node.js package.json:

...
"scripts": {
    "start": "node index.js"
  }
...

and Angular package.json:

...
"scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  }
...

How to start node.js and angular at the same time?

I've tried wrong solutions:

"scripts": {
    "start": "node index.js && ng serve",
    "start-2": "node index.js && cd .\ui\ && ng serve",
}

Please help. thanks advance

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