React checker
React is a JavaScript library for building user interfaces. Many modern web apps render their front end with it. Enter any website below to check whether it uses React. The check is free and needs no signup.
Enter a website address and press Scan.
Detection reads the page HTML, response headers and cookies. Tools that load later or run only on the server can be missed.
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How we detect React
We look for data-reactroot or data-reactid attributes, the React developer tools hook, or a bundled react-dom file. Many production builds hide these, so a React site can be missed.
Detection reads what the page sends to a visitor. A site can hide React, or use it only on the server, and then we can't see it.