# Create React App (CRA) Guide ## As a script tag Add the script tag to your `index.html`. Refer to the [CDN Guide](https://github.com/aidenybai/react-scan/blob/main/docs/installation/cdn.md) for the available URLs. ```html ``` ## As a module import In your project entrypoint (e.g. `src/index`, `src/main`): ```jsx // src/index.jsx // must be imported before React and React DOM import { scan } from "react-scan"; import React from "react"; scan({ enabled: true, }); ``` If you want react-scan to also run in production, use the react-scan/all-environments import path ```diff - import { scan } from "react-scan"; + import { scan } from "react-scan/all-environments"; ``` > [!CAUTION] > React Scan must be imported before React (and other React renderers like React DOM) in your entire project, as it needs to hijack React DevTools before React gets to access it.