Added errorhandler middleware

src/middlewares/ErrorHandler.ts

@@ -0,0 +1,14 @@
+import { ExpressErrorMiddlewareInterface, Middleware } from "routing-controllers";
+
+/**
+ * Our Error handling middlware that returns our custom httperrors to the user.
+ */
+@Middleware({ type: "after" })
+export class ErrorHandler implements ExpressErrorMiddlewareInterface {
+    public error(error: any, request: any, response: any, next: (err: any) => any) {
+        if (response.headersSent) {
+            return;
+        }
+        response.json(error);
+    }
+}