Proofread API doesn't work

[Rákóczi Piroska]

Hello,

I am building a chrome extension in which there is feater that should proofread the inserted text.

I had it checked by claude.ai and agent-zero.ai and even chatGPT, but all are saying there is nothing wrong with the codes.

I think when I fill the form of the token, I don't write the suitable url. I insert a url, like https://chrome://extensions/my_extension_ID

Is this the problem or anything else?

Can you use proofreader api with chrome extensions?

Best regards,

Piroska

[Thomas Steiner]

Hi Rákóczi,

Yes, the Proofreader API is supported in Chrome Extensions. You need to sign up for the trial at https://developer.chrome.com/origintrials/#/view_trial/1988902185437495297. To register your extension for a trial, you use the URL chrome-extension://YOUR_EXTENSION_ID, for example chrome-extension://ljjhjaakmncibonnjpaoglbhcjeolhkk. To use a trial feature inside of a background script, popup, sidepanel, or offscreen document, use the trial_tokens key in your manifest.json file.

"trial_tokens": ["YOUR_TOKEN"]

See https://developer.chrome.com/docs/web-platform/origin-trials#extensions for additional background.

Cheers,

Tom

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----- BEGIN PGP SIGNATURE -----

Version: GnuPG v2.4.8 (GNU/Linux)

iFy0uwAntT0bE3xtRa5AfeCheCkthAtTh3reSabiGbl0ck

0fjumBl3DCharaCTersAttH3b0ttom.xKcd.cOm/1181.

----- END PGP SIGNATURE -----

[Thomas Steiner]

Hi Piroska,

Could you share the code for your simple extension? That would help me to see what might be going wrong.

Cheers,
Tom

On Fri, Oct 24, 2025 at 1:30 PM Rákóczi Piroska <piroska...@gmail.com> wrote:

Hello Thomas,

I have done all that you wrote and the proofreading doesn't work.

I made a very simple version of the extension.

You just insert the text and start the proofreading and the extension doesn't work.

What should I do?

Piroska

[Thomas Steiner]

Hi again,

The problem with your code is that you're using window.ai.proofreader. It should instead be window.Proofreader. Please see the documentation for details.

Cheers,

Tom

On Fri, Oct 24, 2025 at 2:04 PM Rákóczi Piroska <piroska...@gmail.com> wrote:

Thank you, Tom.

I am sending the codes.

If google drive is Ok for you here is the link.

https://drive.google.com/drive/folders/1lJit4YMQx9AeukTSB23BT7tXbCyMXO-8?usp=drive_link

If you need another kind of format let me know.

Thank you again.

Piroska

[Thomas Steiner]

On Fri, Oct 24, 2025, 15:37 Rákóczi Piroska <piroska...@gmail.com> wrote:

Hello Tom,

You were absolutely right.

It worked with reel Proofreader.

Glad to hear it worked. 

It colored to red the incorrect words. Is that all it can do? Can it give a suggestion for correct spelling?

I could provide you with the answer: it's "yes, it can do more", but I let you find out the details by, again, pointing you at the documentation. See the link in the previous email. Godspeed!

Cheers,

Tom

Thanks a lot!!

Piroska