npm start json-server in background

Question

I'm trying to have my npm start script run json-server in the background in parallel to then running react-scripts to start UI. How would I go about doing this? I've tried various things with single & and prestart, etc but everything results in json-server starting to watch my db file but then react-scripts doesn't run.

The main 2 which I thought should do the trick are below, but neither work.

  "scripts": {
    "prestart" : "json-server --watch ../sample-db.json --port 3010 --delay 800&",
    "start": "set HTTPS=true&&react-scripts start",

and

  "scripts": {
    "start": "json-server --watch ../sample-db.json --port 3010 --delay 800&set HTTPS=true&&react-scripts start",

Answer 1

Not quite a duplicate, but as indicated by @Max this has a few options:

How can I run multiple npm scripts in parallel?

So here's one way:

"scripts": {
  "start": "set HTTPS=true&&react-scripts start",
  "mockserver": "json-server --watch ../sample-db.json --port 3010 --delay 800",
  "startdev": "concurrently --kill-others \"npm start\" \"npm run mockserver\"",
}

And I see that on windows I need to use "start" which was why single ampersand wasn't working.