Why doesn't build_runner generate files when serializing JSON in dart/flutter

I had the same issue. Solved by using the below command

flutter packages pub run build_runner build --delete-conflicting-outputs

I had a similar issue, but I am using Android Studio IDE and I have done the following step:

**File => Invalidate caches / Restart**

Run following command:

flutter clean

flutter pub get

flutter packages pub run build_runner build --delete-conflicting-outputs

About **--delete-conflicting-outputs**

Assume conflicting outputs in the users package are from previous builds, and skip the user prompt that would usually be provided.

[Reference][1]


[1]:

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Add built_value_generator to the `pubspec.yaml` to `dev_dependencies` section

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You can read the official documentation -

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In my case the build_runner process was successful but the .g files weren't produced. I had to restart the IDE (vscode) before I start seeing the .g files.

try something like this via terminal:
1. Delete previous generated files via command: find ./ -name '*.g.dart' -delete
2. then: flutter packages pub run build_runner watch —delete-conflicting-outputs

The issue is with package dependency, executing this `flutter pub upgrade --major-versions` will do the thing.

changing the part and class to the same name of the file fixed the issue with me

Make sure this `targets` bit goes into `build.yaml` and **NOT** `pubspec.yaml`.

Add this file in the root directory with `pubspec.yaml`

`build.yaml` file

Add the following lines

targets:
$default:
builders:
freezed:
options:
any_map: true
explicit_to_json: true

Then run

flutter clean
flutter pub get
flutter packages pub run build_runner build --delete-conflicting-outputs