escape chars function

lib/cartodb/middleware/error-middleware.js

@@ -189,3 +189,22 @@ function setErrorHeader(errors, statusCode, res) {
     
     res.set('X-Tiler-Errors', JSON.stringify(errorsLog));
 }
+
+/**
+ * Remove problematic nested characters 
+ * from object for logs RegEx
+ * 
+ * @param {Object} object 
+ */
+function stringifyForLogs(object) {
+    Object.keys(object).map(key => {
+        const value = object[key];
+        if (object instanceof Object) {
+            stringifyForLogs(value);
+        } else {
+            object[key] = object[key].replace(/[^a-zA-Z0-9]/g, ' ');
+        }
+    });
+
+    return JSON.stringify(object);
+}