---
title: "Important: #81899 - Backend AJAX routes use \"&route=/ajax/\" instead of \"ajaxId\" parameter"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:important-81899"
source: "Changelog/9.0/Important-81899-BackendAJAXRoutesUseRouteajaxInsteadOfAjaxIdParameter.rst"
modified: "2026-09-15T10:46:36+00:00"
---

# Important: #81899 - Backend AJAX routes use "&route=/ajax/" instead of "ajaxId" parameter

See [forge#81899](https://forge.typo3.org/issues/81899)

## Description

The TYPO3 Backend uses AJAX calls by calling routes with the `&route=/ajax/*` GET/POST parameter
now instead of the "&ajaxId" GET/POST parameter.

Although this is not a breaking change, some PHP code might rely on GET/POST parameters being
set, and must check for the route parameter instead.