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npm install nodemon -g
nodemon app.js

If you don’t want to set the environment variable, another option is to modify the scripts part of package.json from:

"start": "react-scripts start"


Linux (tested on Ubuntu 14.04/16.04) and MacOS (tested by @aswin-s on MacOS Sierra 10.12.4):

"start": "PORT=3006 react-scripts start"

or (may be) more general solution by @IsaacPak

"start": "export PORT=3006 react-scripts start"

Windows @JacobEnsor solution

"start": "set PORT=3006 && react-scripts start"
export PORT=3005
npm start

How to run React Node.js Yarn from git hub source 
check version
node -v: v6.11.1
npm -v: 5.3.0
yarn --version (if you use Yarn):

Firstly Delete package-lock.json file in your project folder.
And then install dependencies again by npm install. That should solve this issue.

npm install

Steps to Reproduce
(Write your steps here:)

npm install -g create-react-app
create-react-app my-app ... cd my-app/
npm start

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