Last updated on 2024年10月2日

How do you debug mobile web app offline and online behavior?

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Debugging mobile web apps can be challenging, especially when you need to test how they behave offline and online. Make sure your app works smoothly and reliably in different network conditions to handle transitions between offline and online modes gracefully. Learn some tips and tools to help debug mobile web app offline and online behavior.

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Mukta Sharma

LinkedIn TOP VOICE || 3C - Communication, Collaboration, Community || Community TOP VOICE*5 || TOP 100 Women In Tech ||…

1 Use Chrome DevTools

One of the most powerful and convenient tools for debugging mobile web apps is Chrome DevTools. Use it to inspect and modify your app's HTML, CSS, JavaScript, and network requests, as well as simulate different devices, orientations, and network speeds. To use Chrome DevTools, connect your mobile device to your computer via USB, enable USB debugging on your device, and open Chrome on both devices. Then, go to chrome://inspect on your computer and select your device and app from the list. This will open a DevTools window where you can debug your app as if it were running on your computer.

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Mukta Sharma

LinkedIn TOP VOICE || 3C - Communication, Collaboration, Community || Community TOP VOICE*5 || TOP 100 Women In Tech || TOP 10 LinkedIn Influencers- London || AWS Certified || Scrum Master || Technical Blogger
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To debug your mobile app, you can use Chrome DevTools. Using Chome DevTools, you can inspect your application HTML, CSS & Network requests. You can also check network speed. The process to use ChromeDevTools to debug your mobile app as follows: 1. Connect your real mobile device via USB, 2. Enable USB Debugging mode on your mobile device 3. Open Chrome on both devices 4. Go to chrome://inspect on your computer 5. Select the device and the app from the given list. 6. This should open a DevTools window where you can debug your mobile app as if it was running on your computer. The process is efficient, simple and brings good results.

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Muhammad Usman - ISTQB?CTFL

Top LinkedIn Voice | QA Architect | Web, Mobile & API's Testing | ETL Testing | CI/CD | Cypress | Playwright | Selenium | Cucumber | Kataloon Studio | Appium | Flutter | k6 | jMeter | Docker | AWS | xDevsinc, xNorthbay.
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As a QA lead, I often faced challenges when debugging mobile web app behavior across different network conditions. One of the most helpful tools in my workflow has been Chrome DevTools. I remember a project where the app behaved inconsistently offline. To debug this, I connected my mobile device via USB, enabled USB debugging, and used DevTools to simulate various network speeds. It allowed me to inspect the app's network requests and modify JavaScript in real-time, quickly identifying the offline caching issue. This hands-on debugging technique not only saved time but also gave our team confidence that the app would perform well across all conditions.

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2 Use Service Workers

Service workers are JavaScript files that run in the background and act as proxies between your app and the network. They can intercept and modify network requests, cache resources, and provide offline functionality. Service workers are essential for building progressive web apps (PWAs), which are web apps that can work offline, load fast, and behave like native apps. To use service workers, register them in your app's main JavaScript file, and then write the logic for handling network events, caching strategies, and offline fallbacks in the service worker file. Use Chrome DevTools to inspect and debug your service workers, as well as test how your app works offline by checking the Offline checkbox in the Network panel.

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Muhammad Usman - ISTQB?CTFL

Top LinkedIn Voice | QA Architect | Web, Mobile & API's Testing | ETL Testing | CI/CD | Cypress | Playwright | Selenium | Cucumber | Kataloon Studio | Appium | Flutter | k6 | jMeter | Docker | AWS | xDevsinc, xNorthbay.
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As a QA lead, ensuring smooth offline functionality has always been a priority, especially for progressive web apps (PWAs). On one project, we faced issues with our app not loading properly offline. We identified that the service worker wasn’t caching resources correctly. Using Chrome DevTools, I inspected the service worker and tested the app by enabling the "Offline" mode in the Network panel. I quickly noticed that the caching strategy was incomplete. After adjusting the service worker logic to properly handle caching and network events, the app loaded seamlessly offline, making it much more reliable for users with unstable connections.

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3 Use Local Storage

Local storage is a web API that allows you to store data in the browser, without relying on the server or cookies. Local storage can persist data across sessions, tabs, and reloads, and can store up to 5 MB of data per origin. Use local storage to store user preferences, settings, form data, or any other data that you want to keep offline and sync online later. To use local storage, use the localStorage object in JavaScript, which provides methods for setting, getting, removing, and clearing data. Also use Chrome DevTools to view and edit your local storage data in the Application panel.

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Muhammad Usman - ISTQB?CTFL

Top LinkedIn Voice | QA Architect | Web, Mobile & API's Testing | ETL Testing | CI/CD | Cypress | Playwright | Selenium | Cucumber | Kataloon Studio | Appium | Flutter | k6 | jMeter | Docker | AWS | xDevsinc, xNorthbay.
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As a QA lead, I once encountered an issue where a mobile web app wasn’t saving user preferences across sessions. We were relying on local storage for this functionality, but users complained that their settings weren’t being retained. Using Chrome DevTools, I inspected the localStorage in the Application panel and noticed that the data was being overwritten after each session. By modifying the JavaScript logic, we ensured that localStorage properly saved and persisted user preferences. After this fix, the app retained user settings offline and synced them seamlessly once back online, enhancing the overall user experience.

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4 Use Debugging Tools

In addition to Chrome DevTools, there are a number of other debugging tools available to help debug mobile web app behavior both offline and online. Remote Debugging allows you to debug your app on a remote device or emulator with tools like Safari Web Inspector, Firefox Remote Debugging, or Android Studio. Debugging Extensions are browser extensions that provide additional features for debugging, such as Lighthouse which audits performance, accessibility, and PWA readiness or React Developer Tools which lets you inspect and modify React components and state. Debugging Libraries are JavaScript libraries that provide debugging functions or utilities such as console.log which prints messages to the console or debug which lets you create and toggle debug logs with namespaces and colors.

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5 Use Testing Tools

Use testing tools to automate and simulate your app's offline and online behavior, and check for errors, bugs, or inconsistencies. Testing Frameworks such as Mocha, Jasmine, or Jest provide a structure and syntax for writing and running tests. Additionally, Testing Libraries like Chai, Sinon, or Enzyme offer specific functions or assertions for testing. Furthermore, Testing Services such as BrowserStack, Sauce Labs, or Firebase Test Lab offer cloud-based testing platforms or devices. Debugging mobile web app offline and online behavior may be challenging; however, with Chrome DevTools, service workers, local storage, debugging tools, and testing tools it is achievable. By utilizing these tools and techniques, your app will become more reliable and user-friendly in various network scenarios.

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6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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How do you debug mobile web app offline and online behavior?

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1 Use Chrome DevTools

2 Use Service Workers

3 Use Local Storage

4 Use Debugging Tools

5 Use Testing Tools

6 Here’s what else to consider

Mobile Testing

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