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    Home»Development»Flutter Web Hot Reload Has Landed – No More Refreshes!

    Flutter Web Hot Reload Has Landed – No More Refreshes!

    July 2, 2025

    Flutter’s famous hot reload just levelled up — now it works on the web! No more full refreshes every time you tweak a UI. If you’re building apps with Flutter Build Web, this update is a game-changer.

    Let’s dive into what it is, how to use it, why it matters, and see it in action.

    What Is Hot Reload for Flutter Web?

    Previously, Flutter Web only supported hot restart, meaning the entire app state would reset every time you changed code. That slows you down, especially in apps with complex UI or setup steps.

    With Flutter Web hot reload, you can now:

    • Inject code changes into the running app
    • Preserve state
    • Update UI instantly
    • Skip full browser reloads

    Now the Fun Part: How to Use It

    Make sure you’ve upgraded to Flutter 3.32 or later to use this feature.

    Command Line

    Run your app on the web with hot reload using:

    flutter run -d chrome --web-experimental-hot-reload

    While it runs:

    • Press r → hot reload
    • Press R → hot restart

     

    VS Code Setup

    To use hot reload from VS Code, update your launch.json like this:

    "configurations": [
    
      {
    
        "name": "Flutter web (hot reload)",
    
        "type": "dart",
    
        "request": "launch",
    
        "program": "lib/main.dart",
    
        "args": [
    
          "-d",
    
          "chrome",
    
          "--web-experimental-hot-reload"
    
        ]
    
      }
    
    ]

     

    Then:

    • Enable “Dart: Flutter Hot Reload On Save” in VS Code settings
    • Use the lightning bolt to hot reload
    • Use the ⟳ button to hot restart

    DartPad Support

    Hot reload is also now available in DartPad!

    • Visit dartpad.dev
    • Load any Flutter app
    • If hot reload is supported, you’ll see a Reload button appear
    • You can test UI tweaks right in the browser — no install required

    Measuring Reload Time

    No extra setup is needed to measure performance. Flutter now logs reload time directly in your terminal:

    Screen shot

    You’ll see this every time you trigger a hot reload (r in terminal or ⚡ in editor). It’s a great way to verify the reload speed and confirm it’s working as expected.

    Demo: Hot Reload & State Retention

    Here’s how to clearly showcase hot reload in action with screen recordings:

    Hot Reload with UI Change

    Shows instant UI updates without refresh

    State Retention Demo

     Proves the state is preserved after hot reload

    This visual comparison makes it obvious why hot reload is better for iteration.

    Summary

    Flutter Web hot reload represents a significant advancement for rapid, stateful development in the browser.

    • Instant UI feedback
    • State preservation
    • DartPad support
    • Built-in performance logging
    • Works on Flutter 3.32+

    If you’ve been avoiding Flutter Web because of slow reload cycles, now’s the time to dive in again.

    This feature is still experimental — expect even more improvements soon.

    Source: Read More 

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