35 lines
2.3 KiB
Markdown
35 lines
2.3 KiB
Markdown
---
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id: debugging
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title: Debugging
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layout: docs
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category: Guides
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permalink: docs/debugging.html
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next: testing
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---
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## Debugging React Native Apps
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To access the in-app developer menu, shake the iOS device or press `control + ⌘ + z` in the simulator.
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> Hint
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>
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> To disable the developer menu for production builds, open your project in Xcode and select `Product` → `Scheme` → `Edit Scheme...` (or press `⌘ + <`). Next, select `Run` from the menu on the left and change the Build Configuration to `Release`.
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### Reload
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Selecting `Reload` or pressing `⌘ + r` in the simulator will reload the JavaScript that powers your application. If you have added new resources (such as an image to `Images.xcassets`) or modified any Objective-C/Swift code, you will need to re-build from Xcode for the changes to take effect (you can do this with `⌘ + r` in Xcode).
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### Chrome Developer Tools
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To debug the JavaScript code in Chrome, select `Debug in Chrome` from the developer menu. This will open a new tab at [http://localhost:8081/debugger-ui](http://localhost:8081/debugger-ui).
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Press `⌘ + option + i` or select `View` → `Developer` → `Developer Tools` to toggle the developer tools console. Enable [Pause On Caught Exceptions](http://stackoverflow.com/questions/2233339/javascript-is-there-a-way-to-get-chrome-to-break-on-all-errors/17324511#17324511) for a better debugging experience.
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To debug on a real device: Open the file `RCTWebSocketExecutor.m` and change `localhost` to the IP address of your computer. Shake the device to open the development menu with the option to start debugging.
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#### React Developer Tools (optional)
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Install the [React Developer Tools](https://chrome.google.com/webstore/detail/react-developer-tools/fmkadmapgofadopljbjfkapdkoienihi?hl=en) extension for Google Chrome. This will allow you to navigate the component hierarchy via the `React` in the developer tools (see [facebook/react-devtools](https://github.com/facebook/react-devtools) for more information).
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### Live Reload
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Select `Enable Live Reload` via the developer menu to have the application automatically reload when changes are made to the JavaScript.
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### FPS (Frames per Second) Monitor
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On `0.5.0-rc` and higher versions, you can enable a FPS graph overlay in the developers menu in order to help you debug performance problems.
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