JAVASCRIPT

Syntax for creating a specific version of react app

npx create-react-app@3.4.1 my-app

create app with a specific react version

// if changing the create-react-app  script version does nothing then
npx create-react-app

//edit the package.json for react 
{	
  	"react": "^16.0.0",
	"react-dom": "^16.0.0",
}

// run in terminal in the project folder
npm i

// and it will work