How to check if a website is built with React?

React is an open-source JavaScript library for building user interfaces, particularly single-page applications.
Facebook, or Meta, maintains it with a community of individual developers and companies.
To determine if a website was built using React, you have two options: check with an online detection tool or inspect the website’s code yourself.
Method 1: Use an online React detector tool
An online tool is the easiest way to check if a website is built with React.
- Copy the URL of the website you want to check.
- Paste into our free React detector tool.
You will have your answer in seconds. It will also tell you if other tools are used.
Method 2: Check the source code manually
You can also check the source code manually, but it is a bit more technical.
- Open the Website: Go to the website you want to check.
- View Source Code: Right-click anywhere on the page and select “View Page Source” or “View Source” from the context menu. In some browsers, you can also press
Ctrl+U
(Windows) orCmd+Opt+U
(Mac) to open the source code directly. - Search for Keywords: In the source code, press
Ctrl+F
(Windows) orCmd+F
(Mac) to open the search box. Then, search for keywords associated with React.js, such as “data-reactroot,” “data-reactid,” or other React hints.
A little tip: the website’s landing page isn’t often built with React, but the web app part can often be React-based. React isn’t particularly SEO-friendly, so the website usually has landing pages built with other, more SEO-friendly technologies.
Check out our guide on which website platform is used.
Other popular web stacks you can investigate
Website builders
- SquareSpace detector (also detects themes).
- Webflow detector.
- Framer detector.
- Wix detector.
- Bubble.io detector.
- Weebly detector.
- Unbounce detector.
E-commerce platforms
- WooCommerce detector (also detects themes).
- Shopify detector.
- BigCommerce detector.
- PrestaShop detector.
- OpenCart detector.
CMS
Javascript frameworks
Christoffer Pettersen
Founder, Web developerPettersen is the founder of Stackcrawler, a platform that helps analyze tech stacks. He is passionate about new trends and technologies in the software industry.