---
title: "Deprecation: #94762 - Deprecate JavaScript top.fsMod state"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:deprecation-94762"
source: "Changelog/11.4/Deprecation-94762-DeprecateJavaScriptTopfsModState.rst"
typo3-version: "11.4"
typo3-major: 11
type: "deprecation"
issue: 94762
forge: "https://forge.typo3.org/issues/94762"
tags: ["Backend", "JavaScript", "NotScanned", "ext:backend"]
rendered: "2026-10-03T08:19:36+00:00"
---

# Deprecation: #94762 - Deprecate JavaScript top.fsMod state {#deprecation-94762}

See [forge#94762](https://forge.typo3.org/issues/94762)

## Description {#description}

The JavaScript object `top.fsMod` manages the "state" for page-tree and
file-tree related contexts in the backend user-interface like this:

-   `top.fsMod.recentIds.web` contained the current ("recent")
    page or file related identifier details were shown for
-   `top.fsMod.navFrameHighlightedID.web` contained the currently
    selected identifier that was highlighted in page-tree or file-tree
-   `top.fsMod.currentBank` contained the current mount point or
    file mount ("bank") used in page-tree or file-tree

To get rid of inline JavaScript and reduce usage of JavaScript `top.*`,
mentioned `top.fsMod` has been marked as deprecated and replaced by new component
`TYPO3/CMS/Backend/Storage/ModuleStateStorage`.

## Impact {#impact}

As fall-back, reading from `top.fsMod` is still possible, changing
data will cause a JavaScript exception.

## Affected Installations {#affected-installations}

Sites using custom modifications for JavaScript aspects in the backend user
interface relying on `top.fsMod`.

## Migration {#migration}

New `ModuleStorage` component is capable of providing similar behavior,
corresponding state is written to `sessionStorage` and available for current
client user session (per browser tab).

```javascript
import {ModuleStateStorage} from '../Storage/ModuleStateStorage';
let identifier: string, selection: string|null, mount: string|null;

// reading state
// -------------

const currentState = ModuleStateStorage.current('web');

identifier = top.fsMod.recentIds.web; // deprecated
identifier = currentState.identifier; // replacement

selection = top.fsMod.navFrameHighlightedID.web; // deprecated
selection = currentState.selection; // replacement

mount = top.fsMod.currentBank; // deprecated
mount = currentState.mount; // replacement

// updating state
// --------------

// ModuleStateStorage.update(module, identifier, selected, mount?)
ModuleStateStorage.update('web', 123, true, '0');

// ModuleStateStorage.updateWithCurrentMount(module, identifier, selected)
ModuleStateStorage.updateWithCurrentMount('web', 123, true);
```