diff --git a/internal/engine/injector.go b/internal/engine/injector.go
index 42284c9..ed22e3b 100644
--- a/internal/engine/injector.go
+++ b/internal/engine/injector.go
@@ -364,42 +364,8 @@ func (i *Injector) InjectEditorScript(doc *html.Node) {
 		return
 	}
 
-	// Create script element that loads insertr.js from our server
-	scriptHTML := fmt.Sprintf(`<script src="http://localhost:8080/insertr.js" data-insertr-injected="true"></script>
-<script type="text/javascript" data-insertr-injected="true">
-// Initialize insertr for demo sites
-document.addEventListener('DOMContentLoaded', function() {
-    if (typeof window.Insertr !== 'undefined') {
-        console.log('✅ Insertr library loaded successfully');
-        
-        // The library has auto-initialization, but we can force initialization
-        // with our demo configuration
-        window.Insertr.init({
-            siteId: '%s',
-            apiEndpoint: 'http://localhost:8080/api/content',
-            mockAuth: true, // Use mock authentication for demos
-            debug: true
-        });
-        
-        console.log('✅ Insertr initialized for demo site with config:', {
-            siteId: '%s',
-            apiEndpoint: 'http://localhost:8080/api/content',
-            mockAuth: true
-        });
-    } else {
-        console.error('❌ Insertr library failed to load');
-        
-        // Fallback for demo gates if library fails
-        const gates = document.querySelectorAll('.insertr-gate');
-        gates.forEach(gate => {
-            gate.addEventListener('click', function(e) {
-                e.preventDefault();
-                alert('🚧 Insertr library not loaded\\n\\nPlease run "just build-lib" to build the library first.');
-            });
-        });
-    }
-});
-</script>`, i.siteID, i.siteID)
+	// Create script element that loads insertr.js from our server with site configuration
+	scriptHTML := fmt.Sprintf(`<script src="http://localhost:8080/insertr.js" data-insertr-injected="true" data-site-id="%s" data-api-endpoint="http://localhost:8080/api/content" data-mock-auth="true" data-debug="true"></script>`, i.siteID)
 
 	// Parse and inject the script
 	scriptDoc, err := html.Parse(strings.NewReader(scriptHTML))
@@ -414,7 +380,7 @@ document.addEventListener('DOMContentLoaded', function() {
 		return
 	}
 
-	log.Printf("✅ Insertr.js library and initialization script injected")
+	log.Printf("✅ Insertr.js library injected with site configuration")
 }
 
 // injectAllScriptElements finds and injects all script elements from parsed HTML
diff --git a/lib/src/index.js b/lib/src/index.js
index 3311410..a7ddc97 100644
--- a/lib/src/index.js
+++ b/lib/src/index.js
@@ -79,7 +79,18 @@ window.Insertr = {
 // Auto-initialize in development mode with proper DOM ready handling
 function autoInitialize() {
     if (document.querySelector('.insertr')) {
-        window.Insertr.init();
+        // Check for configuration from script data attributes
+        const insertrScript = document.querySelector('script[data-insertr-injected]');
+        const config = {};
+        
+        if (insertrScript) {
+            config.siteId = insertrScript.getAttribute('data-site-id') || 'demo';
+            config.apiEndpoint = insertrScript.getAttribute('data-api-endpoint') || '/api/content';
+            config.mockAuth = insertrScript.getAttribute('data-mock-auth') === 'true';
+            config.debug = insertrScript.getAttribute('data-debug') === 'true';
+        }
+        
+        window.Insertr.init(config);
     }
 }
 
diff --git a/test-sites/demo-site/insertr.js b/test-sites/demo-site/insertr.js
index fabfbc1..9f63cff 100644
--- a/test-sites/demo-site/insertr.js
+++ b/test-sites/demo-site/insertr.js
@@ -4104,7 +4104,18 @@ Please report this to https://github.com/markedjs/marked.`,e){let r="<p>An error
     // Auto-initialize in development mode with proper DOM ready handling
     function autoInitialize() {
         if (document.querySelector('.insertr')) {
-            window.Insertr.init();
+            // Check for configuration from script data attributes
+            const insertrScript = document.querySelector('script[data-insertr-injected]');
+            const config = {};
+            
+            if (insertrScript) {
+                config.siteId = insertrScript.getAttribute('data-site-id') || 'demo';
+                config.apiEndpoint = insertrScript.getAttribute('data-api-endpoint') || '/api/content';
+                config.mockAuth = insertrScript.getAttribute('data-mock-auth') === 'true';
+                config.debug = insertrScript.getAttribute('data-debug') === 'true';
+            }
+            
+            window.Insertr.init(config);
         }
     }