Stop building expensive proxy servers just for CORS. Enable cross-origin requests directly in your browser with zero infrastructure costs. Note: Some preflight failures cannot be resolved due to browser limitations. Learn more →
Secure cross-origin request management
See how much you can save by eliminating unnecessary infrastructure
Eliminate proxy server costs and focus your budget on what really matters - building great products.
Platform Considerations
Browser extension works on desktop Chrome, Edge, Firefox. For production apps or mobile support, you may still need traditional proxy servers for broader compatibility.
Integrate CORS Unlocker into your application with our npm package in 4 simple steps
import appCors from 'cors-unlocker'
async function initCORS() {
// Check if extension is installed
const isInstalled = await appCors.isExtInstalled()
if (!isInstalled) {
// Show installation guide to user
showInstallPrompt()
appCors.openStorePage()
return false;
}
// Enable CORS for your app
try {
await appCors.enable({
credentials: true, // enable credentials if needed
reason: 'Enable API access for this application'
})
// Now you can make cross-origin requests normally
const response = await fetch('https://api.example.com/data')
const data = await response.json()
console.log(data)
return true;
} catch (error) {
console.error('CORS enable failed:', error)
return false;
}
}
Real developers, real savings. See how CORS Unlocker eliminates infrastructure costs across different use cases.
Build internal dashboards and tools that integrate multiple SaaS APIs without paying for proxy servers.
Test API integrations instantly during development without setting up backend infrastructure first.
Launch faster with zero infrastructure costs. Perfect for validating ideas before investing in backend.
Everything you need for seamless cross-origin request management
✅ Supported: Chrome, Edge, Firefox, and all Chrome Web Store compatible browsers
❌ Not Supported: Safari (extension API limitations), Mobile browsers (no extension support)