In the index.html, you can use this %PUBLIC_URL%
<link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
In the javascript code, you can use this process.env.PUBLIC_URL
render() {
// Note: this is an escape hatch and should be used sparingly!
// Normally we recommend using `import` for getting asset URLs
// as described in “Adding Images and Fonts” above this section.
return <img src={process.env.PUBLIC_URL + '/img/logo.png'} />;
}