Check `package.json` for the `react` version under `dependencies` or `devDependencies`
Run `npm list react` in the project directory
Run `yarn list react` in the project directory
Run `pnpm list react` in the project directory
Open `node_modules/react/package.json` and check the `version` field
In the browser console, run `React.version` if React is available globally
In a React app, import React and log `React.version` in code