Debugging on Mobile Devices
In this document you will learn how to get started with debugging on mobile devices and covers the following solutions:
- Debugging on iOS devices
- Debugging on Android devices
- Using Charles on mobile devices
Minimum requirements for iOS debugging
- Safari version 6+ running on Mac MacOS
- iPhone or iPad with iOS 6+
Using Safari Remote Debugging
Apple's iOS 6 update introduced Safari Remote Debugging, which allows you debug web pages in the Safari app on iOS devices. To get started, follow the steps below:
- Connect your iOS device to your machine via USB cable.
- On your device, open the Settings app. Select Safari, scroll down to the bottom of the page and open the Advanced menu. Enable the Web Inspector option.
- Still on your device, open the Safari app and browse to any web page.
- On your Mac, launch Safari, open the Preferences (Safari > Preferences), and navigate to the Advanced section. Enable the Show Develop menu in the menu bar option.
- Open the Develop menu. You will see your iOS device listed. When you mouse over your device name, you will see the URL to the site you've browsed to on your device displayed.
- Select the URL and a Web Inspector window will open, allowing you to preview, inspect, and debug content on your mobile browser from your desktop.
- In the Resources section, you can preview and inspect the web page. Hovering over elements in the Web Inspector will highlight the corresponding elements in the browser on your iOS device.
- You can also use the Debugger and Console sections to further debug your page by setting breakpoints, logging data, etc.
Minimum requirements for Android debugging
- Chrome 32+ running on Mac or Windows
- Android device with Chrome for Android 32+
Note: The steps in this section were written using a device running Android 4.3.
Enabling debugging on your device
Before you can begin debugging content on your device, you need to enable USB debugging in your device settings.
- If you are a running Android 4.2+, you will need to enable your device's Developer options before you can turn on USB debugging. On your device, open the Settings app and select the About phone menu. Locate your device's Build number and tap it seven times.
- Hit your device's Back button and you will see the Developer options menu listed in the Settings.
- Open the Developer options menu and check the box to enable USB debugging.
Remote debugging using Chrome for Android
Now that USB debugging is enabled on your device, follow these steps to start remote debugging with Chrome:
- On your computer, launch Chrome and browse to
about:inspect. On the Devices page, enable the Discover USB devices option.
- Connect your device to your machine via USB cable. On your device, you will be prompted with a dialog asking if you would like to allow USB debugging. Choose OK to allow your computer to connect to your device.
- On your device, open the Chrome app and browse to a web page.
- Return to Chrome on your computer. On the
about:inspectpage, you should see your connected device. Below your device name, you will be able to see a list of all of the pages open in Chrome on your device.
- To begin debugging a web page, select the inspect link below the page URL. This will open Chrome's Developer Tools.
- To the left of the Elements tab, you can select the device icon to open DevTool's Screencast feature. This allows you to open a live preview of the content as it appears on your mobile device. For more information on how you can use screencasting to interact with your device, visit Google's documentation.
Charles for mobile
Charles is a web proxy that can be run on your own computer, allowing you to record data that is sent and received via your web browser. Visit the Charles website for more information on this application.
Minimum requirements for Charles
- Charles is compatible with Windows, Mac and Linux
- iOS and/or Android device
Setting up Charles on your machine
Follow the steps below to get Charles running on your machine.
- Download and install Charles on your machine.
- On your computer, run Charles. From the menu, select Proxy > Proxy Settings. Ensure a port has been assigned (e.g., 8888) and the Enable transparent HTTP proxying option is selected.
- Select OK to save changes and close the dialog.
- From the menu, select Proxy > SSL Proxy Settings. Ensure the Enable SSL Proxying option is selected.
- In the Location section, select the Add button. In the Edit Location dialog, navigate to the Port field and enter 443. Select OK to save this change.
- Select OK to close the Edit Location dialog.
- Select OK to exit the SSL Proxying Settings dialog.
- Navigate to Help > SSL Proxying > Install Charles Root Certificate on a Mobile Device or Remote Browser.
- You should see a message that identifies the local Server IP and Port number (8888) that you will use to set up the device. You should also see the URL to download and install the certificate. Copy these to your computer for later use.
Setting up Charles on your device
In this section, you will learn how to set up your iOS and/or Android device to work with Charles on your computer.
Setting up your iOS device
- On your device, make sure you are connected to the same network as your computer. You can verify this by navigating to settings > Wifi and selecting the network name to show advanced options.
- In the HTTP section at the bottom, select Manual mode. Then, add the Server IP and Port number (8888) that you copied from Charles in a previous step.
- On your device, open a browser and navigate to http://www.charlesproxy.com/getssl. You will be redirected to your device settings where you will be prompted to install the Charles Proxy Custom Root Certificate profile. Select the Install button to install the Charles certificate on your device.
- Follow the steps to install the Charles certificate. When complete, select Done.
- Next, you are ready to ensure that your device trusts the Charles certificate. On your device, navigate to General > About > Certificate Trust Settings. Here you should find the Charles Proxy certificate.
- Enable the Charles certificate. Notice the warning message. You may want to disable this certificate when not debugging with Charles.
- Now, you will be able to see any data sent and received in Charles.
Setting up your Android device
- On your device, open a browser and navigate to //chls.pro/ssl.
- You will be prompted with a Certificate name dialog. Specify a name for the certificate and set the Used for field to Wi-Fi. Select OK to install the certificate.
- Next, open the Settings > Wi-Fi menu. You will see a list of networks that you have connected to on your device. Select the wireless network that you are currently connected to. Remember, this network must match the network you are connected to on your computer.
- This will open a small dialog with three options—Edit, View, or Forget. Select Edit.
- In this dialog, scroll down to the bottom and enable the Show advanced options field. This will reveal Proxy and IP settings.
- Change the Proxy settings field to Manual.
- Fill out the Proxy host name field with your computer's IP address and the Proxy port field to match the port set in Charles (by default, the port is set to 8888). Select Save.
- In your device's default browser, navigate to a website. You will be able to see any data sent and received in Charles.