How to check if a website is built with React?

Updated Written By Christoffer
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.

  1. Copy the URL of the website you want to check.
  2. 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.

  1. Open the Website: Go to the website you want to check.
  2. 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) or Cmd+Opt+U (Mac) to open the source code directly.
  3. Search for Keywords: In the source code, press Ctrl+F (Windows) or Cmd+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.

Website builders

E-commerce platforms

CMS

Javascript frameworks

Article by

Christoffer Pettersen

Founder, Web developer

Pettersen is the founder of Stackcrawler, a platform that helps analyze tech stacks. He is passionate about new trends and technologies in the software industry.