---
title: "Breaking: #78899 - Remove extJSCODE from FormEngine result array"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-78899-1668719172"
source: "Changelog/8.6/Breaking-78899-RemoveExtJsCodeFromFormEngineResultArray.rst"
modified: "2026-09-15T10:46:36+00:00"
---

# Breaking: #78899 - Remove `extJSCODE` from FormEngine result array

See [forge#78899](https://forge.typo3.org/issues/78899)

## Description

The key `extJSCODE` in the array returned by FormEngine's `Container` and `Element` (initialized
in `AbstractNode->initializeResultArray()`) has been removed.

## Impact

JavaScript code added to `extJSCODE` by custom elements will not be evaluated anymore.

## Affected Installations

Search extensions for the string `extJSCODE`. This array is used rather seldom, but if there are matches
in combination with Backend Form classes, they should be adapted.

## Migration

For a simple solution, add according JavaScript to the return key `additionalJavaScriptPost` for now.
Both keys were used nearly identically anyway. Be aware that both keys `additionalJavaScriptPost` and
`additionalJavaScriptSubmit` are target of a later removal as soon as a better JavaScript side event handling
for those scenarios is in place. See if the current code injected at this point could be done with
casual `RequireJsModules` instead already.