---
title: "Important: #78336 - Generate preview links with a chash"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:important-78336"
source: "Changelog/8.7.x/Important-78336-GeneratePreviewLinksWithAChash.rst"
typo3-version: "8.7.x"
typo3-major: 8
type: "important"
issue: 78336
forge: "https://forge.typo3.org/issues/78336"
tags: ["Backend", "Frontend", "TSConfig"]
rendered: "2026-09-17T21:17:42+00:00"
---

# Important: #78336 - Generate preview links with a chash {#important-78336-generate-preview-links-with-a-chash}

See [forge#78336](https://forge.typo3.org/issues/78336)

## Description {#description}

The preview link configuration has been extended to be able to generate links with a cHash.

Provide the setting `useCacheHash = 1` to add a cHash. This is essential for records displayed
using Extbase which enforces cHash usage.

```typoscript
TCEMAIN.preview {
	<table name> {
		previewPageId = 123
		useCacheHash = 1
		fieldToParameterMap {
			uid = tx_myext_pi1[showUid]
		}
		additionalGetParameters {
			tx_myext_pi1[special] = HELLO
		}
	}
}
```

If `useCacheHash = 1` is not set, the `no_cache` parameter will be added just like before.