Simplify folder structure

lib/api/middlewares/syntax-error.js

@@ -0,0 +1,12 @@
+'use strict';
+
+module.exports = function syntaxError () {
+    return function syntaxErrorMiddleware (err, req, res, next) {
+        if (err.name === 'SyntaxError') {
+            err.http_status = 400;
+            err.message = `${err.name}: ${err.message}`;
+        }
+
+        next(err);
+    };
+};