Published on May 15, 2024

How to Optimize React JS Code for Better SEO Potential

How to Optimize React JS Code for Better SEO Potential

The component-based architecture and virtual DOM characteristics of React are two reasons many developers love using React to build dynamic user interfaces. However, its reliance on JavaScript can make JavaScript SEO for React a challenge. This is because search engine crawlers struggle to render complex JS code perfectly, hindering your website’s visibility in SERPs.

This article dives into proven strategies like pre-rendering with SSR and structured data markup to bridge the gap between React’s dynamism and search engine discoverability. So if you want to learn how to write SEO-friendly code, stick around, we’ve got you covered!

Use Prerendering SSR Rendering Technique

The first strategy to optimize your SEO for React JavaScript is choosing the right rendering technique. By default, the rendering path for React is client-side rendering (CSR). This means search engine crawlers initially see a blank HTML page with minimal content. Since crawlers depend on readily available content to understand and index a page, this lack of initial content can negatively impact your React site’s SEO performance.

To optimize JavaScript for SEO, many developers turn to server-side rendering (SSR). With SSR, web content is rendered on your own servers rather than putting the burden on the user agent. As a result, search engine crawlers are served a complete HTML page containing all your content, allowing them to access and index your content much faster, potentially improving your website’s SERP visibility.

Related: Learn the difference between different types of rendering techniques, including SSR, CSR, and prerendering.

That said, implementing SSR isn’t without drawbacks. Setting up and maintaining a custom SSR solution can be expensive. Additionally, for content requiring frequent updates, a complex SSR setup might be necessary to ensure content freshness, further adding to the development burden. This is where Prerender steps in.

How Prerender Works

Prerender is an SSR solution built and maintained by the Prerender team. This means you get all the SEO benefits for your React-based website without heavily investing in sourcing your own SSR infrastructure—the ideal option for improving SEO for React JavaScript.

As a pre-rendering tool for JavaScript websites, Prerender creates the HTML version of your React JS pages, caches them, and then feeds this pre-rendered content to search engine crawlers. Consequently, they can easily understand your page, significantly improving the indexing rate (up to 260% faster indexing) for your React application and your website visibility. Get the details about how Prerender works and its benefits here.

Optimize Page Speed

Google loves fast-loading websites, and they reward it with a greater chance of ranking high in search results. Unfortunately, React apps can have a lot of JavaScript code that, if not properly optimized, can severely slow down the site.

Here are a couple of ways you can use to optimize your React code for improved page speed:

  • Code Splitting

Code splitting allows you to break down your React application into smaller code bundles. This reduces initial load time, making your site faster to crawl and index.

To implement code splitting in React, simply wrap the component to be lazy-loaded with React.lazy and use a Suspense component to handle loading states. In the example below, only the code for MyComponent and its immediate dependencies are loaded initially. Doing this will reduce bundle size and significantly improve initial load time performance.

import React, { Suspense } from ‘react’;

// Lazy-loaded component
const OtherComponent = React.lazy(() => import(‘./OtherComponent’));

function MyComponent() {
  return (
      {/* Initial content that loads immediately */}
      <h1>This content loads first!</h1>

      <Suspense fallback={<div>Loading OtherComponent…</div>}>
        <OtherComponent />
  • Minification

Remove unnecessary characters like whitespace, comments, and unused code from JavaScript, CSS, and HTML files. This leads to smaller file sizes that load faster and can be automatically done using tools like UglifyJS and cssnano.

  • Memoization

Use React.memo or libraries like reselect to prevent unnecessary re-renders of React components and optimize performance by only re-rendering components when their props or state actually changes.

Top tip: Get other practical tips on improving your Google PageSpeed score in this guide.

Use React Helmet

Search engines rely on elements within the <head> section to understand the content and purpose of your web pages. Some important SEO elements here include:

  • Robots meta tags

These tags instruct search engine crawlers how to interact with your web pages. Compared to a robots.txt file, they provide more granular control and can be applied on a per-page basis.

  • Title tags

The title tag specifies the title of your webpage, and it’s what appears in search results and browser tabs. 

  • Description tags

The description tag provides a summary of your webpage content. It’s displayed as a snippet in search results, often below the title tag.

  • Open graph tags

Open graph meta tags are crucial in determining how your content appears when shared on social media. If you’re managing a React-based ecommerce site, for example, optimizing the open graph meta tags ensures that your product pages display as rich snippets.

Optimizing these elements improves the visual appeal and discoverability of your content to search engines and on social media, which can indirectly benefit your SEO by increasing engagement and sharing. However, the nature of React apps presents a unique obstacle when modifying metadata. To optimize it efficiently, you need to use a helper library like React Helmet.

React Helmet simplifies the management of elements within the <head> tag of your React application by enabling you to insert metadata using standard HTML syntax. By doing so, you maintain clean and focused React components dedicated to UI logic. This approach enhances code readability and maintainability while facilitating easier updates to meta tags, as modifications can be made in a centralized location.

If you want to learn how to implement React Helmet in your React apps, follow this guide.

4 Best Practices for Optimizing JavaScript SEO for React

Optimizing JavaScript SEO for React can be difficult, but there are several tips you can follow to get the most out of your React JS SEO potential.

1. Add Schema Data Markup

Adding schema markup (also known as structured data markup) to your React.JS application can improve search results by providing richer information about your content, such as ratings, reviews, events, or products. This leads to richer snippets and increased click-through rates (CTR). 

Follow this schema markup tutorial blog to learn how to implement data markup for various website types, including ecommerce, job market, and real estate.

2. Optimize Content Assets

Images, videos, and other assets significantly impact your React app’s performance and SEO. Optimize these assets by compressing them, serving them at the correct size, and using proper file formats. Additionally, you can implement lazy loading to prioritize critical content and further reduce initial load times.

3. Ensure Accessibility

Accessible features, like clear headings, proper structure, and alternative text for images, help search engines crawl and understand your content more easily. This, in turn, leads to a positive user experience and can improve search rankings and increase organic traffic.

4. Create Mobile-Friendly Experience

Mobile-friendliness is not just a trend; it’s a necessity for SEO success today. Google and other search engines have adopted a mobile-first indexing approach, which means they primarily use the mobile version of your website for ranking and indexing purposes.

If your React application is not mobile-friendly, search engines will struggle to understand your content and the overall user experience of your site, ultimately leading to lower search rankings. To start improving your mobile site performance, check out our 7 Tips For Creating Mobile-Friendly JS Sites guide.

Address React JavaScript SEO Challenges with Prerendering

Dealing with React JavaScript SEO challenges can be difficult, but by applying the above strategies and best practices, you can significantly improve the SEO potential of your React application. 

Here are the key approaches to improve your React JavaScript SEO:

  • Use Prerender to implement dynamic rendering. It’s better than using client-side rendering or self-built server-side rendering, and it’s easy to implement.
  • Improve the overall PageSpeed and performance of your React app.
  • Optimize your <head> section with React Helmet.

Remember, optimizing your React.JS code for SEO is an investment that pays off both in the short and long run because it delivers a fantastic user experience and helps your site thrive in search engine results pages. 

Let Prerender improve React crawling and indexing performance so your pages will be loved by Google and your users. See our affordable packages or start with the free plan. Sign up now!

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