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Generate Different Environments For Your Application From A Single Json File. With Pure Dart.

Falvors with Pure Dart 🍧 #

This package will ease how you manage your app Flavors(Environments).

Getting Started #

Add this to your package's pubspec.yaml file #

  • Add flavorz your dependencies.
  • Add build_runner to your dev_dependencies, since we are going to use it to generate the code.
  flavorz: ^1.0.0

  build_runner: ^2.2.0

Now in terminal, run dart pub get or flutter pub get to install the packages.

How to Use #

The are 2 files that require your attention:

  • .flavor.json File
  • .g.dart File

None of the above files exist in your project yet. We will create the .flavor.json file manullay. And the .g.dart file will be generated by command.

Create .flavor.json File #

The .flavor.json file holds the configurations for all of your falvors(environments). And it must be placed anywhere inside the lib folder.

We have to create a new file under the lib folder and name it like this name.flavor.json, the name can be anything. but the extension must be the same.

So, let's create an example file and will name it env.flavor.json. Inisde the json file there must be 2 attributes:

  • 'environmentToRun'
  • 'environments'

'environmentToRun' is a string value that should hold the name of the flavor(environment) that we wish to run.

'environments' is a list of configuration for each flavor. And the each falvor must have the following attribute:

  • _name

You can add as many attributes as you want after the _name. And you can add as many flavors as you want in the environments list.

Notes For The Json File

  • You should never remove the '_name' attribute
  • It is prefferable to use camelCase format for your attribute names
  • Attributes that start with an underscore will be generated as private

Following is a sample of how the file should look like:

    "environmentToRun": 0,
    "environments": [
            "_name": "dev",
            "versionNumber": "Dev 1.0.0",
            "camelCaseAttribute": ""
            "_name": "local",
            "versionNumber": "Local 1.0.1",
            "camelCaseAttribute": ""

As you can see, the 'environments' list holds all different flavors for your app. e.g Dev, Prod, Mock.

Run The Builder #

In your terminal, run dart run build_runner build or flutter pub run build_runner build to generate the environment file.

After running the command, a new file will be generated. The generated file will have the same name & path of the .flavor.json file from previous step. The extension of the generated file will be .g.dart

In the example above, we created a json file with this name: env.flavor.json, That means the generated file's name will be: env.g.dart

The generated file will contain the Environment class that we can use across our app.

Start Using The Environment Class #

  • First, from your main file, you must call the Environment.init() function. Or else I'll break your PC with an error :)
  • After that, you can access your environment data from anywhere in your application using the factory Environment()
void main() async {
  await Environment.init();
  if (Environment().type == EnvironmentType.dev) {
    print('We are running the dev environment!');


  • You only need to run the build_runner when you have changed the attribute names or the number of attributes inside .flavor.json file. In other words, if you changed the structure of the flavor.
  • If you just changed the values in the .flavor.json file, then there is no need to regenerate
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Generate Different Environments For Your Application From A Single Json File. With Pure Dart.

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