How to create an isomorphic application with Reactjs?

Creating an isomorphic application with ReactJS involves the same basic steps as creating any ReactJS application, but with the additional step of ensuring that your ReactJS code can run on both the client side and the server side.

Here’s a basic step by step guide on how you can create an isomorphic ReactJS application.

1. Initial setup:

First, you need to setup your development environment. Install Node.js and npm (node package manager).

1. Create a new project:

Create a new directory for your project and create a `package.json` file inside it. This file will contain all the dependencies for your project. Install React, React-dom, Express, and Babel using npm. \`\`\` npm init npm install —save react react-dom express babel-core babel-loader babel-preset-es2015 babel-preset-react \`\`\`

1. Setup babel:

Babel is used to compile ES6 JavaScript code into a version of JavaScript that can run in current browsers. Create a `.babelrc` file in your project root directory and set it up to use the es2015 and react presets. \`\`\` { “presets”: [“es2015”, “react”] } \`\`\`

1. Create your server:

You can use Express for this. Create a `server.js` file and write your server code in it. This server code should include logic to render your ReactJS components to a string which can be sent to the client as part of the server’s response. \`\`\`javascript import express from ‘express’; import React from ‘react’; import { renderToString } from ‘react-dom/server’; import MyComponent from ‘./MyComponent’; const app = express(); app.get(‘/’, (req, res) => { const html = renderToString(); res.send(html); }); app.listen(3000, () => console.log(‘Server is running on localhost:3000’)); \`\`\`

1. Setup webpack:

Webpack is used to bundle your ReactJS code into a single file that can be included in a browser. Create a `webpack.config.js` file and provide the necessary configuration to use babel-loader to compile your JavaScript files. \`\`\`javascript module.exports = { entry: ‘./client.js’, output: { filename: ‘bundle.js‘ }, module: { rules: [ { test: /.(js|jsx)$/, exclude: /node\_modules/, use: { loader: ‘babel-loader‘ } } ] } }; \`\`\`

1. Create your React components:

Create `MyComponent.js` file and write your ReactJS component code.

1. Run your application:

Now you can run your application. First, start webpack to compile your ReactJS code: \`\`\` $ ./node\_modules/.bin/webpack \`\`\` Then start your server: \`\`\` $ node server.js \`\`\`

Remember, it’s very important to ensure that your application behaves the same regardless of whether the initial render happens on the server or the client.