npm start does not work on Node.js 11.3.0 and above.

[hermanho]

Is this a bug report?

Yes

Did you try recovering your dependencies?

Yes

Which terms did you search for in User Guide?

Node compatibility, http error 400

Environment

  System:
    OS: Windows 10
    CPU: x64 Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz
  Binaries:
    npm: 6.4.1 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: 44.17763.1.0
    Internet Explorer: 11.0.17763.1
    Chrome: 73.0.3683.75
  npmPackages:
    react: ^16.8.4 => 16.8.4
    react-dom: ^16.8.4 => 16.8.4
    react-scripts: 2.1.8 => 2.1.8
  npmGlobalPackages:
    create-react-app: Not Found

Steps to Reproduce

(Write your steps here:)

1. Download an install node-v11.3.0-x64.msi
2. Open PowerShell
3. Set environment variable $env:DEBUG="*" for debugging
4. Run npx create-react-app new-app.
5. Run npm start

Expected Behavior

The default template should be shown in browser.

Actual Behavior

The browser will show http error 400.

[mg4u]

Same problem for 10.15.3

[zanotta]

I had the same problem, turns out it was some software blocking port 3000 in my laptop.

My solution:
Change the start port to 8081(creating a .env file in root folder with port=8081)