Don't use Undiscord. Use Discrub instead. It is available on the Google Web Store, has a 4.5 rating with over 220 reviews, and is being actively maintained.

[gaveitatry2]

UPDATE: MY FIXED UNDISCORD VERSION HAS ALWAYS WORKED, BUT I FEEL JADED ABOUT UNDISCORD SO I AM SWITCHING TO DISCRUB.

I am thinking about abandoning Undiscord. It does not sit right with me that the 401 errors have existed for three years and the Undiscord developer doesn't want to do anything about it. So many people have posted possible fixes, and not a single one has been implemented. We can show clear, concrete evidence that for the 401 errors, Undiscord is taking a user's password and plugging that into the Authentications Token box. Why in the world would we be happy with our Discord password being taken and plugged somewhere it does not belong? And the fix is so simple. We can just replace the word "password" with "text" and the 401 errors go away and the script works. Also, in two years, we only got one freaking update, and the only thing that it did was fix a transparency issue.

The following extension seems to be a better alternative to Undiscord. I thought about using it 6-12 months ago, but I am often afraid to try new things. But I'm probably going to switch to it now. It is regularly updated, has a lot of users, has a lot of positive reviews, is available on Chrome Web Store, and seems to do a great job. It probably has more features too. Like mass editing messages instead of removing them, etc.

Discrub - A working alternative to Undiscord that you can install from Chrome Web Store
https://chromewebstore.google.com/detail/discrub/plhdclenpaecffbcefjmpkkbdpkmhhbj/

It bothers me that this Undiscord developer pretty much ignores everyone for years, but is probably quick to instantly delete a message like this recommending a working alternative.

PREVIOUSLY

DISCLAIMER: This fix has nothing to do with 403 errors or index.json files. So if you need help with 403 errors or index.json files, please try elsewhere. Thank you.

To fix the 401 errors, install the fixed Undiscord here (version 5.2.4.with.fixes):

https://greasyfork.org/en/scripts/502561-undiscord

The fix is very simple. I just replaced the word "password" with the word "text" to stop Undiscord from inserting our Discord password instead of our Authentication Token.

Some people claimed that this fixed version did not work for them, but it has worked for a lot of people. As for myself, it completely solved my problem and I did not have any 401 errors or any other errors since August 2024.

Background story:

For two years, Undiscord was abandoned and stuck on v5.2.3. Users were unable to use it because of 401 errors. These errors are caused by autofill. Undiscord takes the user's Discord password and replaces the Authentication Token with it, and that is the cause of the 401 errors.

I applied the fixes suggested here and named my version 5.2.3.with.fixes:
#627 (comment)

I also modified Line 101. There was a problem where if my browser window was too small, anytime I clicked on the Undiscord button the popup Undiscord window would be mostly off-screen. So I changed the position attribute and set it to right:44px, which means the right edge of the Undiscord window will always be 44px from the right edge of the browser no matter how small the browser window might be.

Then around June 2025, there was a bug where the official v5.2.3 and my v5.2.3.with.fixes was broken because the Undiscord window was almost completely transparent, making it impossible to see. The official developer of Undiscord then came back after a two year absence and applied some fixes to fix the transparent Undiscord window. I also applied those fixes to my v5.2.3.with.fixes. However, the official developer did not apply any other fixes for things like the 401 errors.

I then compared my newest v.5.2.3.with.fixes.c with the official v5.2.4. They were identical except I had the fixes for the 401 errors, and two other small fixes for things like the Undiscord window being off screen when the browser window is too small and Undiscord not deleting all of the messages even though there are messages left. When I saw that my userscript was almost identical to v5.2.4, I renamed my version to v5.2.4.with.fixes.

All of the fixes that I made were extremely simple but fixed critical bugs.

You can see the full list of changes by comparing my userscript with the official v5.2.4 one:

https://github.com/victornpb/undiscord/pull/719/files
https://www.diffchecker.com/oLdrptRi/

PS - The fixes that I applied might not work 100% of the time for 100% of the people, but the official userscript is unusable without these fixes and these fixes work most, if not all, of the time. For me, it completely solved the 401 error. And after I applied the fix for Undiscord not deleting all of the messages even though some are remaining, it has not failed to delete all of my messages. Maybe I will encounter problems in the future, but I have had no issues for 12 months now.

[fjjghcctjycycy]

worked!

[4015-al]

thank you

[Darain2]

Thanks!

[yllekz]

Works for me as well. Consider submitting the changes as a PR.

Firefox here, I've tried with Greasemonkey or Violent Monkey, and I still get 401 errors.
Works fine on Brave tho.

[gouenji-shuuya]

Works for me as well. Consider submitting the changes as a PR.

#631 already exists

[LavenderAndChamomile]

Doesn't work for me on Brave browser, but works fine on Chrome.

[gaveitatry2]

I don't know why the recent UI fixes have not been released. It still shows that the latest Undiscord release was two years ago. So weird. Anyway, I already applied the UI fixes to my fixed version of Undiscord. The current version is now v.5.2.3.with.fixes.c.

[gaveitatry2]

Works for me as well. Consider submitting the changes as a PR.

I never did a PR before. Did not know how. I asked Copilot for help and made one now. Just hope it works. If not... well. I do have backup plans.

[baseattackforce]

works, thanks so much!

[gaveitatry2]

I am thinking about abandoning Undiscord. It does not sit right with me that the 401 errors have existed for three years and the Undiscord developer doesn't want to do anything about it. So many people have posted possible fixes, and not a single one has been implemented. We can show clear, concrete evidence that for the 401 errors, Undiscord is taking a user's password and plugging that into the Authentications Token box. Why in the world would we be happy with our Discord password being taken and plugged somewhere it does not belong? And the fix is so simple. We can just replace the word "password" with "text" and the 401 errors go away and the script works. Also, in two years, we only got one freaking update, and it was a simple one that someone else made. It has nothing to do with 401 errors.

The following extension seems to be a better alternative to Undiscord. I thought about using it 6-12 months ago, but I am often afraid to try new things. But I'm probably going to switch to it now. It is regularly updated, has a lot of users, has a lot of positive reviews, is available on Chrome Web Store, and seems to do a great job. It probably has more features too. Like mass editing messages instead of removing them, etc.

Discrub - A working alternative to Undiscord that you can install from Chrome Web Store
https://chromewebstore.google.com/detail/discrub/plhdclenpaecffbcefjmpkkbdpkmhhbj/

It bothers me that this Undiscord developer pretty much ignores everyone for years, but is probably quick to instantly delete a message like this recommending a working alternative.