Unhandled exception: FormatException:

Question

My problem is I Work on flutter app with firebase i make all the steps to can use firebase and i had this exception when i run flutterfire configure command

⠼ Fetching available Firebase projects...

Unhandled exception:

FormatException: Unexpected character (at character 1)

^

#0 _ChunkedJsonParser.fail (dart:convert-patch/convert_patch.dart:1383:5)

#1 _ChunkedJsonParser.parseNumber (dart:convert-patch/convert_patch.dart:1250:9)

#2 _ChunkedJsonParser.parse (dart:convert-patch/convert_patch.dart:915:22)

#3 _parseJson (dart:convert-patch/convert_patch.dart:35:10)

#4 JsonDecoder.convert (dart:convert/json.dart:612:36)

#5 runFirebaseCommand (package:flutterfire_cli/src/firebase.dart:95:25)

#6 getProjects (package:flutterfire_cli/src/firebase.dart:114:20)

#7 ConfigCommand._selectFirebaseProject (package:flutterfire_cli/src/commands/config.dart:278:24)

#8 ConfigCommand.run (package:flutterfire_cli/src/commands/config.dart:368:37)

#9 CommandRunner.runCommand (package:args/command_runner.dart:209:13)

#10 main (file:///C:/Users/IT/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutterfire_cli-0.2.6/bin/flutterfire.dart:57:5)

⠦ Fetching available Firebase projects...

Unhandled exception:

FormatException: Unexpected character (at character 1)

^

#0 _ChunkedJsonParser.fail (dart:convert-patch/convert_patch.dart:1383:5)

#1 _ChunkedJsonParser.parseNumber (dart:convert-patch/convert_patch.dart:1250:9)

#2 _ChunkedJsonParser.parse (dart:convert-patch/convert_patch.dart:915:22)

#3 _parseJson (dart:convert-patch/convert_patch.dart:35:10)

#4 JsonDecoder.convert (dart:convert/json.dart:612:36)

#5 runFirebaseCommand (package:flutterfire_cli/src/firebase.dart:95:25)

#6 getProjects (package:flutterfire_cli/src/firebase.dart:114:20)

#7 ConfigCommand._selectFirebaseProject (package:flutterfire_cli/src/commands/config.dart:278:24)

#8 ConfigCommand.run (package:flutterfire_cli/src/commands/config.dart:368:37)

#9 CommandRunner.runCommand (package:args/command_runner.dart:209:13)

#10 main (file:///C:/Users/IT/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutterfire_cli-0.2.6/bin/flutterfire.dart:57:5)

Answer 1

I had the same issue but the above did not work for me and after much research and trying various combinations of things I solved it with the following sequence:

• Delete all associated apps from your Firebase project using the Firebase console

• Delete the following files in your Flutter project folder (if they exist) my_project/lib/firebase_options.dart
my_project/ios/firebase_app_id_file.json
my_project/macos/firebase_app_id_file.json
my_project/android/app/google-services.json my_project/ios/Runner/GoogleService-Info.plist
my_project/macos/Runner/GoogleService-Info.plist

• Activate and deactivate the flutterfire_cli with

  dart pub global deactivate flutterfire_cli

  dart pub global activate flutterfire_cli

For good measure also

• Exit Android Studio (and terminate running emulators & processes) and re-open
• Re-authenticate Firebase CLI with: firebase login --reauth

Then re-run flutterfire configure

It’s not clear to me whether that all the above steps are necessary (I haven't tried all combinations), but this sequence worked while various subsets of the above did not.

PS I'm developing my Flutter & Firebase project on MacOS with Android Studio.

PPS The flutterfire configure issue should resolve without deleting the GoogleService-Info.plist files for ios/macos. However I had a stale/bad plist file for my ios build which caused my ios Flutter app to crash. Deleting the .plist file and recreating it by rerunning `flutterfire configure' resolved this additional issue. Hence my recommended is to delete it upfront.

Answer 2

Probably you have to update the firebase CLI.

Open a terminal and put these commands:

• curl -sL firebase.tools | upgrade=true bash
• firebase login --reauth