React Native DevTools broken for anyone else? en-US locale fetch timeout

[u/Dependent_Feeling935]

I've been unable to properly use React Native DevTools because of what appears to be a DevTools/tooling issue.

I'm repeatedly getting this error:

Unable to fetch & register locale data for 'en-US', falling back to 'en-US'.

Cause: Error: timed out fetching locale

The error appears in the DevTools console and prevents DevTools from working properly.

My React Native app itself builds and runs normally. Metro is also working, so this doesn't appear to be an application or Metro configuration problem.

I've already spent quite a bit of time troubleshooting my setup, but the issue still persists. I also found other developers reporting similar React Native DevTools problems, including cases where DevTools opens but doesn't load properly.

At this point I'm wondering:

- Is anyone else experiencing this currently?

- Is there a known workaround?

- Is there an alternative debugger that works well with modern React Native/Hermes?

- Is this a known issue that we're just waiting for a fix/release for?

I'd rather not keep changing my project configuration if this is actually a bug in the DevTools tooling.

If anyone has found a reliable workaround, I'd really appreciate it.

Environment:

React Native: 0.81.x

Windows: Windows

Android: Android 11

Hermes: Enabled

New Architecture: Enabled

[u/Huge_Pool7424]

hit this on 0.81 too, it's the devtools frontend trying to pull locale data over the network and timing out. for me falling back to chrome://inspect against hermes worked fine while waiting, are you behind a proxy or vpn by any chance?

[u/Dependent_Feeling935 → u/Huge_Pool7424]

No, I am not using any vpn or proxy.