Why can't I view React app in browser?

Can I see your code? It's possible you are editing the wrong file, and so you aren't seeing the results change.

I seem to remember having a similar issue when I started with React. I can't seem to remember the exact solution I did for this. If you post your code it will help. But here are my exact steps I use to setup a react environment from scratch.

Install Node.js Install VisualStudio Code from vs code's terminal install react by tying ins "npm install -g create-react-app" from any directory you can then type in "create-react-app my-app" a folder named my-app will be created, navigate to this directory and then type in "npm start"

if you do all the steps above it should work.

it sounds like your code is working just fine. when you run npm start at first that is your first thing you see in react. when you run create-react-app you see the react logo and edit src/App.js next you need to delete the stuff inside of App.js and add your own content inside of App.js you import your components, and add them to the App.js file

import React from 'react';
import Header from './components/Header';

class App extends React.Component {
   render() {
        return (
         <div>
            <Header />
         </div>
      )
  }
export default App;

something similar to this... to kick it off. best of luck.