# Troubleshooting
## I got `Unsupported` meesage from React DevTools
If you're using React Native version >= 0.62 and keep React Native Debugger as the latest version, here is what you can do:
In your app project, make sure the `react-devtools-core` dependency to match the React DevTools version. Add resolutions in your `package.json` for Yarn:
```json
{
"resolutions": {
"react-devtools-core": "~4.28.0"
}
}
```
or NPM:
```json
{
"overrides": {
"react-devtools-core": "~4.28.0"
}
}
```
Reference: [Unsupported DevTools backend version - # React Native Debugger](https://gist.github.com/bvaughn/4bc90775530873fdf8e7ade4a039e579#react-native-debugger)
If the React Native version of your project doesn't support `react-devtools-core@4.25`, please consider downgrade React Native Debugger version to v0.12.
## Network fetch got issue like [`SyntaxError: Unexpected token o in JSON at position 1`](https://github.com/jhen0409/react-native-debugger/issues/382#issuecomment-544226529) if Network Inspect enabled
This may be caused by some library used / made fetch polyfills, it may used `Blob` but RNDebugger does not support it. If you got this issue, try to use global `fetch` / `XMLHttpRequest` instead, or try [#382#issuecomment-544226529](https://github.com/jhen0409/react-native-debugger/issues/382#issuecomment-544226529).
## Debugger causes app to load stale JS bundle ([#423](https://github.com/jhen0409/react-native-debugger/issues/423))
This issue was fixed by [v0.10.9](https://github.com/jhen0409/react-native-debugger/releases/tag/v0.10.9) and [v0.11.1](https://github.com/jhen0409/react-native-debugger/releases/tag/v0.11.1). If you are still using the old version for some reason, you can turn off Network cache manually on devtools:
## Some shortcuts (e.g. `Reload` / `Clear AsyncStorage`) are missing on the Debugger
- For Android and React Native version less than v0.60, you need to add and link [`react-native-devsettings-android`](https://github.com/jhen0409/react-native-devsettings-android) package
- If you're not using dev bundle (dev=true) from React Native packager, it will not working as expected.
- For some reasons, some dependencies may affected [Promise](https://github.com/jhen0409/react-native-debugger/blob/master/app/worker/utils.js#L7) behavior. It is recommended to use the initial project to find out the reason.
- If you are sure it is caused by a new version of React Native, please file an new issue.
## How to resolve problem of high memory usage on devtools?
You may have got a problem when you often reload JS, devtools process takes your RAM even more than 1G, it does not seem to clean.
In case of using [official remote debugger](https://reactnative.dev/docs/debugging#chrome-developer-tools), tested a initial project with remote debugging mode on Chrome 62 (beta), continuous reload JS 30 times:
Before:
After:
Fortunately, the current versions of RNDebugger (Chromium 58) is better than Chrome (maybe >= 59?), but it still has a amount of growth:
Before:
After:
To avoid similar problems in the future, there is a way to restart the Chrome devtools (macOS: `CMD+OPTION+I`, Linux/Windows: `CTRL+ALT+I`), the same applies to official remote debugger on Chrome. You can also consider to use [`timesJSLoadToRefreshDevTools` option in Config file in home directory](config-file-in-home-directory.md).
## [iOS] Debugger can't load bundle when I use real device
If you're getting the following error:
It may caused by [`xip.io`](http://xip.io) service (RN use it for debug on real device), it lead your machine IP doesn't resolved sometimes. It's [enabled by default](https://github.com/facebook/react-native/blob/ca9202f2385354b7a6b4d818ceb46bd96a037a7b/scripts/react-native-xcode.sh#L94), you can disable it in RN custom script on Xcode if you sure you don't need the service:
## React Inspector get stuck at "Connecting to React…" for RN ^0.43 ([#45](https://github.com/jhen0409/react-native-debugger/issues/45))
It usually on Android, the problem is related to `requestIdleCallback` API (try to check if it not work on debug mode).
This issue have been fixed in `react-devtools-core@^2.3.0`, please ensure the version is correct in your React Native project (Note that it's dependency of `react-native`).
Also, sometimes it have timer problem between host machine and device (emulator), you need make sure `date & time` setting is correct:
Or try to restart your device (emulator).
## [Windows 10] React native debugger process starts but no visible window ([#459](https://github.com/jhen0409/react-native-debugger/issues/459))
This issue is caused by Windows 10 dark mode, for a workaround please disable dark mode and enable it again after launching react-native-debugger
## Other documentations
- [Getting Started](getting-started.md)
- [Debugger Integration](debugger-integration.md)
- [React DevTools Integration](react-devtools-integration.md)
- [Redux DevTools Integration](redux-devtools-integration.md)
- [Apollo Client DevTools Integration](apollo-client-devtools-integration.md)
- [Shortcut references](shortcut-references.md)
- [Network inspect of Chrome Developer Tools](network-inspect-of-chrome-devtools.md)
- [Enable open in editor in console](enable-open-in-editor-in-console.md)
- [Config file in home directory](config-file-in-home-directory.md)
- [Contributing](contributing.md)