SvelteKitError: Not found: /.well-known/appspecific/com.chrome.devtools.json

[ianengelbrecht]

Describe the bug

I'm suddently getting this in my terminal during dev mode. No idea what's caused it or whether it's actually impacting anything. I am reading a value from localStorage in my root +layout.json file, but that's the only interaction with localstorage in the app, other than setting that value on user sign in.

Best of luck...

SvelteKitError: Not found: /.well-known/appspecific/com.chrome.devtools.json
at resolve (C:\devprojects\learning\pwa-ktt\node_modules@sveltejs\kit\src\runtime\server\respond.js:582:13)
at C:\devprojects\learning\pwa-ktt\node_modules@sveltejs\kit\src\runtime\server\respond.js:370:7
at AsyncLocalStorage.run (node:internal/async_local_storage/async_hooks:91:14)
at with_event (C:\devprojects\learning\pwa-ktt\node_modules@sveltejs\kit\src\runtime\app\server\event.js:49:20)
at resolve (C:\devprojects\learning\pwa-ktt\node_modules@sveltejs\kit\src\runtime\server\respond.js:369:6)
at init_promise.#options.hooks.handle (C:\devprojects\learning\pwa-ktt\node_modules@sveltejs\kit\src\runtime\server\index.js:76:56)
at C:\devprojects\learning\pwa-ktt\node_modules@sveltejs\kit\src\runtime\server\respond.js:364:18
at AsyncLocalStorage.run (node:internal/async_local_storage/async_hooks:91:14)
at with_event (C:\devprojects\learning\pwa-ktt\node_modules@sveltejs\kit\src\runtime\app\server\event.js:49:20)
at respond (C:\devprojects\learning\pwa-ktt\node_modules@sveltejs\kit\src\runtime\server\respond.js:363:26) {
status: 404,
text: 'Not Found'
}

Reproduction

I wouldn't now how to provide a reproduction for this other than providing my actual repo, because I don't know what originally caused this issue.

Logs

System Info

System:
    OS: Windows 11 10.0.22631
    CPU: (12) x64 13th Gen Intel(R) Core(TM) i5-1345U
    Memory: 18.01 GB / 31.66 GB
  Binaries:
    Node: 22.13.1 - C:\nvm4w\nodejs\node.EXE
    npm: 10.9.2 - C:\nvm4w\nodejs\npm.CMD
  Browsers:
    Edge: Chromium (129.0.2792.89)
    Internet Explorer: 11.0.22621.3527
  npmPackages:
    @sveltejs/adapter-auto: ^4.0.0 => 4.0.0 
    @sveltejs/kit: ^2.16.0 => 2.20.3 
    @sveltejs/vite-plugin-svelte: ^5.0.0 => 5.0.3 
    svelte: ^5.0.0 => 5.25.6 
    vite: ^6.0.0 => 6.2.4

Severity

annoyance

Additional Information

No response

[Conduitry]

Sounds like Chrome dev tools making these requests - https://goo.gle/devtools-json-design - which would mean there's nothing for us to fix.

[benquan]

Related:
https://www.reddit.com/r/node/comments/1kcr0wh/odd_request_coming_into_my_localhost_server_from/

To suppress with hooks:

// hooks.server.ts
import type { Handle } from '@sveltejs/kit';

export const handle: Handle = async ({ event, resolve }) => {

	if (
		event.url.pathname.startsWith(
			'/.well-known/appspecific/com.chrome.devtools'
		)
	) {
		return new Response(null, { status: 204 }); // Return empty response with 204 No Content
	}

return await resolve(event);

};

Or create the file according to
https://chromium.googlesource.com/devtools/devtools-frontend/+/main/docs/ecosystem/automatic_workspace_folders.md

I had to create it in static for it to work.

[groundbirdaircat]

In addition to the suggestions provided above by @benquan I noticed at the bottom of the page he linked it mentions a vite plugin that also does the trick.

This feature allows you to use workspaces in Chrome DevTools so you can save changes to local files from the DevTools window.

I'm uninstalling my current IDE, and DevTools will be my new main, who's with me ;)

[srt1104]

As mentioned in the Reddit link shared by @benquan:

It’s a request made by Chrome DevTools itself as part of this feature: https://chromium.googlesource.com/devtools/devtools-frontend/+/main/docs/ecosystem/automatic_workspace_folders.md.

I was able to resolve the issue by navigating to chrome://flags and disabling the DevTools Project Settings. I also disabled DevTools Automatic Workspace Folders since it’s closely related.

[ImalKesara]

@srt1104 Thank you, Btw is it going to be a problem in future ?

[anxpara]

I'm still getting this error with sveltekit 2.21.0 and vite 6.3.5, should i wait for the next sveltekit version?
I'm gonna disable the setting in chrome for now.

[ianengelbrecht]

Also still getting it with vite 6.3.5

…

On Wed, May 14, 2025 at 9:05 PM anxpara ***@***.***> wrote: *anxpara* left a comment (sveltejs/kit#13743) <#13743 (comment)> I'm still getting this error with sveltekit 2.21.0 and vite 6.3.5, should i wait for the next sveltekit version? I'm gonna disable the setting in chrome for now. — Reply to this email directly, view it on GitHub <#13743 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACH3QI2CLUXF4AA3LZGMOP326OHZJAVCNFSM6AAAAAB35NDNK2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQOBRGI2TEMJRGU> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[xgwang-scienceos]

Thanks for the flag disable solution: @srt1104

One caveat: I had to restart chrome after disabling flags for it to work

[applemate]

same problem

[Rich-Harris]

Given how prevalent this is (I encounter it constantly) and how annoying it is, I think it would be reasonable to do something about it, even if that's just suppressing errors in dev to prevent console spam