HA Core 2025.10.2 Update: YAML Editor Syntax Highlighting Missing - How to get it back?

sksarda · October 11, 2025, 10:18am

Hello,

Note that I have the Home Assistant Green running Home Assistant Core (Home Assistant OS). After updating Home Assistant Core to version “2025.10.2” that came out today, I noticed that the YAML editor in both the “Automation editor” and “Dashboard editor” no longer displays syntax highlighting, indentation colours, or different colours for comments/values. Everything appears as plain white text.

I have tried refreshing the browser (Ctrl+Shift+R) and clearing the cache, but the issue persists.
Previously, in all versions that I have had including “2025.10.1”, syntax highlighting worked correctly.
Functionality of automations and dashboards seems unaffected; it is purely a visual/UI issue.
This affects both automations I am editing and YAML views in dashboards.

“Question / Request:”

Am I doing something wrong and can I do anything to get it working right?
Is this a known issue in 2025.10.2? Will it be fixed in an upcoming patch?
Is there a recommended workaround in the meantime?

Thank you for looking into this!

LiQuid_cOOled · October 11, 2025, 10:25am

Definitely a new glitch, seeing the same!

Open issues already

github.com/home-assistant/frontend

YAML editor lost syntax highlighting and autocompletion since 2025.10.2 update

opened 02:23AM - 11 Oct 25 UTC

alan-altruy

### Checklist - [x] I have updated to the latest available Home Assistant versi…on. - [x] I have cleared the cache of my browser. - [x] I have tried a different browser to see if it is related to my browser. - [x] I have tried reproducing the issue in [safe mode](https://www.home-assistant.io/blog/2023/11/01/release-202311/#restarting-into-safe-mode) to rule out problems with unsupported custom resources. ### Describe the issue you are experiencing Since updating to Home Assistant Core 2025.10.2, the integrated YAML editor (used in Automations, Scripts, and Scenes) has lost both syntax highlighting and autocompletion. The text now appears as plain text without any color, and no suggestions are shown when editing YAML keys or values. This happens consistently on both desktop browsers and the Android mobile app. ### Describe the behavior you expected The YAML editor should display syntax highlighting and provide autocompletion for available keys, entities, services, etc., as it did before the 2025.10.2 update. ### Steps to reproduce the issue 1. Update Home Assistant Core to 2025.10.2 2. Open an automation or script 3. Switch to Edit in YAML mode 4. Observe that syntax highlighting and autocompletion are missing ### What version of Home Assistant Core has the issue? 2025.10.2 ### What was the last working version of Home Assistant Core? 2025.10.1 ### In which browser are you experiencing the issue? Google Chrome 128.0.6522.195 (Desktop and Android) Also reproducible in Firefox and the official Home Assistant Android app. ### Which operating system are you using to run this browser? Android 16 (Samsung S23 Ultra) Windows 11 (Desktop) ### State of relevant entities ```txt ``` ### Problem-relevant frontend configuration ```yaml None. Occurs with default dashboard and without custom themes or frontend modifications. ``` ### JavaScript errors shown in your browser console/inspector ```txt No relevant errors. ``` ### Additional information <img width="1080" height="2199" alt="Image" src="https://github.com/user-attachments/assets/86ee3892-1602-4b4f-b4f1-824ada84cdc6" />

dengi76 · October 13, 2025, 3:13pm

Hello! I’m experiencing the same problem!

MnemoBRMC · October 15, 2025, 1:32pm

Same for me
What is weird is I have two instances, and updating both, it only happens in one. So it is like there is an incompatiblity with any custom component or so.

MilesTEG · October 16, 2025, 7:25am

Hello,
I experienced the same problem.
I hope this will be fixed soon

LiQuid_cOOled · October 16, 2025, 7:28am

A fix is scheduled for Friday from my understanding…

maisun · October 16, 2025, 7:54am

Thanks, see the same and also shortcut for searching stops working
Great it’s fixed quickly

MnemoBRMC · October 18, 2025, 3:35pm

It is still happening after update 2025.10.3
Edit: Now is fixed, after 2 reboots and some time, not sure why

bob.t · October 18, 2025, 5:47pm

FWIW, yesterday’s update fixed the issue on my system (HA Green unit)

LiQuid_cOOled · October 19, 2025, 10:19pm

Did you clear your browser cache after the update?