What are some examples of React hydration?

What are some examples of React hydration?

React hydration is the process of attaching event listeners to server-rendered HTML. For example, if you have a React app that renders a list of items on the server, hydration allows the client-side React to take over that HTML and make it interactive.

Can you give me a code example of hydration?

Sure! Here's a simple example:

import React from 'react';
import ReactDOM from 'react-dom';

const App = () => <h1>Hello, World!</h1>;

// Server-side rendering
const html = ReactDOMServer.renderToString(<App />);

// On the client side
ReactDOM.hydrate(<App />, document.getElementById('root'));

This code shows how to render a React component on the server and then hydrate it on the client.

What are the benefits of using hydration?

Hydration improves performance by allowing the server to send fully rendered HTML to the client, reducing the time to first paint. It also enhances SEO since search engines can index the content more easily.

Are there any common pitfalls with hydration?

Yes, common pitfalls include mismatches between server-rendered and client-rendered content, which can lead to warnings or errors. It's important to ensure that the initial state is the same on both sides.