import LicenseInfo from '@mui/x-data-grid-premium'; LicenseInfo.setLicenseKey(process.env.REACT_APP_MUI_LICENSE_KEY || '');
Then in .env :
REACT_APP_MUI_LICENSE_KEY=demo ⚠️ This only works in . In production, the watermark will appear unless you have a valid license. 4. Remove MUI X Premium Components Entirely If you don't want to pay for a license: Downgrade to the free version ( @mui/x-data-grid instead of -pro or -premium ): npm uninstall @mui/x-data-grid-pro @mui/x-data-grid-premium npm install @mui/x-data-grid Then replace imports: mui x missing license key remove
import LicenseInfo from '@mui/x-data-grid-premium'; // or pro // Disable license warning (only if you're 100% sure you're using free features only) LicenseInfo.setLicenseKey(''); import LicenseInfo from '@mui/x-data-grid-premium'