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Adding React directly in HTML

Adding three files (and your component .js file(s)) to your HTML file allows you to quickly use React:


RESETRUNFULL
'use strict';
const e = React.createElement;
function LikeButton() {
  const [liked, setLiked] = React.useState(false);
  if (liked) {
    return 'You liked this.';
  }
  return (
    /* JSX code following… */
    <button onClick={() => setLiked(true)}>
      Like
    </button>
  );
}
const domContainer = document.querySelector('#like_button_container');
const root = ReactDOM.createRoot(domContainer);
root.render(e(LikeButton));

<!DOCTYPE html><html>
  <head>
    <meta charset="UTF-8" />
    <title>Add React in One Minute</title>
  </head>
  <body>
    <h2>Add React in One Minute</h2>
    <p>This page demonstrates using React with no build tooling.</p>
    <p>React is loaded as a script tag.</p>
    <div id="like_button_container"></div>
    <!-- Load React. -->
    <!-- Note: when deploying, replace "development.js" with "production.min.js". -->
    <script src="https://unpkg.com/react@18/umd/react.development.js" crossorigin></script>
    <script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js" crossorigin></script>
    <script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
    <!-- Load our React component LAST. -->
    <script src="like_button.js" type="text/babel"></script>
  </body></html>

After you have finalized your source codes, to build an optimized webpage for your site visitors, you should be using the production-ready files:


<script crossorigin src="https://unpkg.com/react@18/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@18/umd/react-dom.production.min.js"></script>

and compile the JSX code using Babel:

Command to install Babel's CLI and watch-compile JSX files
npm install babel-cli babel-preset-react-appnpx babel --watch *.js --out-dir build --presets react-app/prod

Any JSX code will be instantly converted to browser-compatible JS codes as you save the files.

You won't need to explicitly import React as is the case for Create React App:


import React, { Component } from 'react';   // already imported in prior <script>…</script>

To do away with the boilerplate 'React.', you can assign a member manually:


const Component = React.Component;