I started a React app with
npm start
with start defined in package.json:

{

  name: testreactapp,

  version: 0.1.0,

  private: true,

  dependencies: {

    react: ^15.6.1,

    react-dom: ^15.6.1,

    react-scripts: 1.0.10

  },

  scripts: {

    start: react-scripts start,

    build: react-scripts build,

    test: react-scripts test --env=jsdom,

    eject: react-scripts eject

  }

}

I want to stop it now, without closing the terminal. How do I do that?

Tried:
npm stop testrectapp
but that throws error that it needs a script

Then tried:
npm run stop with script "stop": "pkill --signal SIGINT testreactapp"
that throws error 'pkill is not recognized as a command'

Edit

Running ps in bash shows:

      PID    PPID    PGID     WINPID   TTY         UID    STIME COMMAND

     6652       1    6652       6652  ?         197612 19:52:49 /usr/bin/mintty

     1092       1    1092       1092  ?         197612   Jul 25 /usr/bin/mintty

    11092    6652   11092      10060  pty1      197612 19:52:49 /usr/bin/bash

    13868    1092   13868        992  pty0      197612   Jul 25 /usr/bin/bash

    11428   13868   11428      17340  pty0      197612 12:48:27 /usr/bin/ps

    11672    1092    1092      11672  ?         197612   Jul 25 /usr/bin/mintty <defunct>

Don't see the app there?