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debugging.md

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Debugging

The following tools are used for debugging the MetaMask mobile app:

  • Redux DevTools - A redux devtools plugin in Expo for debugging Redux
  • Safari Browser - For debugging the in-app browser for the mobile app
  • Google Chrome - For debugging the in-app browser for the mobile app

Debugging Redux with Redux DevTools

To open Redux DevTools on either platforms, press shift+m in the watcher window and select redux-devtools-expo-dev-plugin.

Redux DevTools

This will open a browser window with the Redux DevTools UI, which you can use to inspect the actions that are dispatched to the Redux store.

For reference on how to use Redux DevTools, refer to Redux DevTools project.

Debugging the WebView (in-app browser)

Android

  • Run the app in debug mode (for example, in a simulator)
  • Open Chrome on your desktop
  • Go to chrome://inspect/#devices
  • Look for the device and click inspect

iOS

  • Run the app in debug mode (for example, in a simulator)
  • Make sure the value of webviewDebuggingEnabled prop on the Webview component is true
  • Open Safari on your desktop
  • Go to the menu Develop -> [Your device] -> [Website]

Debugging Network Requests using Reactotron

Reactotron is already configured in the app and can be used to monitor API calls

Install the Reactotron Desktop App

brew install --cask reactotron

Start monitoring

  • Open Reactotron
  • Refresh simulator
  • API logs should appear under Timeline tab in Reactotron.

Troubleshooting (Android)

If Reactotron isn’t picking up connections on Android, run:

adb reverse tcp:9090 tcp:9090

Then refresh the app again.

Debugging with React Native DevTools

React Native DevTools is useful for viewing logs, inspecting components, and profiling the app.

Open DevTools on iOS

  • In the Metro bundler terminal, press Shift + M.
  • Select Toggle Developer Menu.
  • In the iOS Simulator, choose Open JS Debugger.

Open DevTools on Android

  • In the Metro bundler terminal, press Shift + M.
  • Select Toggle Developer Menu.
  • In the Android emulator, choose Open Developer Menu.
  • Select Open DevTools.