[bug]: FlutterFire CLI writes Flutter metadata into firebase.json, breaking Firebase CLI with schema validation errors

[TheDevSaga]

Is there an existing issue for this?

• I have searched the existing issues.

CLI Version

1.3.1

Firebase Tools version

15.5.1

Flutter Doctor Output

[✓] Flutter (Channel stable, 3.38.9, on macOS 26.2 25C56 darwin-arm64, locale en-IN) [535ms]
• Flutter version 3.38.9 on channel stable at /Users/sagararora/src/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 67323de285 (13 days ago), 2026-01-28 13:43:12 -0800
• Engine revision 587c18f873
• Dart version 3.10.8
• DevTools version 2.51.1
• Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android, enable-ios, cli-animations, enable-native-assets, omit-legacy-version-file,
enable-lldb-debugging

[✓] Android toolchain - develop for Android devices (Android SDK version 36.0.0) [2.4s]
• Android SDK at /Users/sagararora/Library/Android/sdk
• Emulator version 36.3.10.0 (build_id 14472402) (CL:N/A)
• Platform android-36, build-tools 36.0.0
• ANDROID_HOME = /Users/sagararora/Library/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
This is the JDK bundled with the latest Android Studio installation on this machine.
To manually set the JDK path, use: flutter config --jdk-dir="path/to/jdk".
• Java version OpenJDK Runtime Environment (build 21.0.8+-14196175-b1038.72)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 26.2) [1,425ms]
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 17C52
• CocoaPods version 1.16.2

[✓] Chrome - develop for the web [7ms]
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

Description

FlutterFire CLI generates or writes Flutter-specific metadata into firebase.json under a top-level flutter key.

However, firebase.json is strictly validated by the Firebase CLI, which does not allow unknown top-level properties. As a result, any Firebase CLI command fails, including:

firebase login

firebase projects:list

firebase deploy

This effectively bricks the Firebase CLI when FlutterFire metadata is present in firebase.json.

Steps to reproduce

just run the command

firebase login --debug

Its giving the error
Object "" in "firebase.json" has unknown property: {"additionalProperty":"flutter"}

Due to which firebase is not able refresh its token when expire

Expected behavior

FlutterFire CLI should not write Flutter-specific metadata into firebase.json

firebase.json should remain Firebase CLI–owned infrastructure config only

FlutterFire metadata should be stored in:

a separate file (e.g. flutterfire.json, .flutterfire/config.json)

or internal FlutterFire CLI state

Firebase CLI should remain usable after FlutterFire setup

Screenshots

No response

Additional context and comments

No response

[github-actions]

Hello 👋, to help manage issues we automatically close stale issues.

This issue has been automatically marked as stale because it has not had activity for quite some time.Has this issue been fixed, or does it still require attention?

This issue will be closed in 15 days if no further activity occurs.

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