GitHub Repo: https://github.com/webcrumbs-community/webcrumbs

We have been running a series of experiments for WebCrumbs where we explore Server-Side Rendering (SSR) of React Components.

Turns out it is not that hard.

All you'll need is a bit of express with ReactDOMServer.renderToString and ReactDOM.hydrate with Webpack, to keep it simple.

Here's an example. It can get more complicated, sure, but you'll get the idea.

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Ok. Now, let's dive back into the practicalities of using React Server-Side rendering without Next.js.

🫵 Okay. Cut to the chase. How do I do it?

To create a simple React Server-Side Rendering (SSR) application with client-side hydration, you'll need to follow several steps.

This involves setting up a Node.js server with Express, creating a React component, rendering it server-side, and then hydrating it on the client-side.

Here's a step-by-step guide:

Step 1: Set Up Your Project

Create a New Directory: Create a new directory for your project and navigate into it.



mkdir react-ssr-demo
cd react-ssr-demo

Initialize npm: Initialize a new npm project.



npm init -y

Install Dependencies: Install Express and React-related packages.



npm install express react react-dom

Step 2: Create the Server

Write the Server Code: Create a file server.js and write the following code:



const express = require('express');
const ReactDOMServer = require('react-dom/server');
const React = require('react');
const SampleComponent = require('./SampleComponent'); // Replace with your component

const app = express();

app.use(express.static('public'));

app.get('/', (req, res) => {
    const componentStr = ReactDOMServer.renderToString(React.createElement(SampleComponent));

    res.send(`
    <!DOCTYPE html>
    <html lang="en">
    <head>
      <meta charset="UTF-8">
      <title>React SSR with Client-Side Hydration</title>
    </head>
    <body>
      <div id="root">${componentStr}</div>
      <script src="/bundled-client.js"></script>
    </body>
    </html>
  `);
});

const PORT = 3000;
app.listen(PORT, () => {
    console.log(`Server is running on http://localhost:${PORT}/`);
});

Here's the explanation of the code above:

Loads Express, React, ReactDOMServer.
Defines a basic React component for rendering.
Initializes an Express server.
Creates a route to handle HTTP GET requests to the root ('/') URL.
Converts the React component into an HTML string using ReactDOMServer.
Includes a script in the HTML for hydrating the server-rendered component on the client side.
Listens for requests on port 3000 and logs a startup message.

Step 3: Configure Webpack for Client-Side Code

Create Webpack Configuration: Create a webpack.config.js file in your project root.



const path = require('path');

module.exports = {
  entry: './client.js',
  output: {
    path: path.resolve(__dirname, 'public'),
    filename: 'bundled-client.js'
  },
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react']
          }
        }
      }
    ]
  }
};

Create hydration logic: In your project, create a new file named client.js:



import React from 'react';
import ReactDOM from 'react-dom';
import SampleComponent from './SampleComponent'; // Replace with your component

ReactDOM.hydrate(
  <SampleComponent />,
  document.getElementById('root')
);

Compile with Webpack: Create the bundled-client.js by running this command:



npx webpack --mode production

Step 4: Running the Server

Start the Server: Run your server using Node.



node server.js

Open Your Browser: Go to http://localhost:3000 to see your server-rendered React component.

🫵 Alright! Is that it?

This guide is for educational purposes and demonstrates the basic concepts of SSR with React and hydration. For complex applications, a more sophisticated setup is recommended.

We're using SSR in WebCrumbs!