diff --git a/composer.json b/composer.json
index 0e4da57..06889cf 100644
--- a/composer.json
+++ b/composer.json
@@ -10,5 +10,10 @@
             "email": "info@mcnd.ca"
         }
     ],
-    "require": {}
+    "require": {},
+    "autoload": {
+        "psr-4": {
+            "TheBugs\\": "src/"
+        }
+    }
 }
diff --git a/src/JavascriptMiddleware.php b/src/JavascriptMiddleware.php
index 658a6d3..c40cd51 100644
--- a/src/JavascriptMiddleware.php
+++ b/src/JavascriptMiddleware.php
@@ -21,10 +21,12 @@ class JavascriptMiddleware implements MiddlewareInterface
         "headers" => [
             "User-Agent" => "TheBugs/1.0",
         ],
+        # Callable functions
+        "functions" => []
     ];
 
     /**
-     * Filter list, allows custom invokable
+     * Filter list, allows custom invokable too
      * @var array
      */
     protected $filters = [];
@@ -56,6 +58,12 @@ class JavascriptMiddleware implements MiddlewareInterface
             }
         }
 
+        foreach($this->filters['functions'] as $func) {
+            if ( $func->bindTo($this, $this)() ) {
+                return $handler->handle($request);
+            }
+        }
+
         $this->throwError(json_decode($request->getBody(), true));
     }
 
diff --git a/templates/xhr_debug.php b/templates/xhr_debug.php
new file mode 100644
index 0000000..ffdcaec
--- /dev/null
+++ b/templates/xhr_debug.php
@@ -0,0 +1,54 @@
+<script>
+    (function(send) {
+        XMLHttpRequest.prototype.send = function(data) {
+            console.log("Hey ! Something was sent !");
+            send.call(this, data);
+        };
+    })(XMLHttpRequest.prototype.send);
+
+    class ErrorHandler
+    {
+        constructor(options) {
+            if ( options ) {
+                if ( "url" in options ) {
+                    this.url = options['url'];
+                }
+            }
+
+            this.catchError();
+        }
+
+        catchError() {
+            window.onerror = function(message, url, line, column, error) {
+                fetch(this.url ? this.url : window.location.href, {
+                    method: "post",
+                    headers: {
+                        'Accept': "application/json",
+                        'Content-Type': "application/json",
+                        'User-Agent': "TheBugs/1.0"
+                    },
+                    body: JSON.stringify({
+                        'message': message,
+                        'url': url,
+                        'line': line,
+                        'column': column,
+                        'stack': error.stack,
+                        'location': window.location.toString()
+                    })
+                }).then( response => response ).then(data => {
+                    console.info("Error reported", data);
+                });
+
+                return false;
+            }.bind(this);
+        }
+
+        get url() {
+            return this._url;
+        }
+
+        set url(set) {
+            return this._url = set;
+        }
+    }
+</script>