How to set up appsettings.json for feature flags using Microsoft Feature Management

Question

Microsoft's feature management documentation implies that the correct format for config for feature management is the following:

{
    "feature_management": {
        "feature_flags": [
            {
                "id": "Feature1",
                "enabled": false
            }
        ]
    }
}

Which are challenging to override in EnvironmentVariables etc ... you'd need

feature_management__feature_flags__0__id: Feature1
feature_management__feature_flags__0__enabled: false

Is there an alternative format?

Ruskin · Accepted Answer · 2025-11-06 03:22:20Z

0

Yes, you can use:

{
    "FeatureManagement": {
        "Feature1": false
    }
}

Which can be overrided using:

FeatureManagement__Feature1: false

If you want the extensibility features, these work as below:

{
    "FeatureManagement": {
        "Feature1": {
            "EnabledFor": [
                "Name": "Foo",
                "Parameters": [ "Bar" ... ]
            ]
        }
    }
}

answered Nov 6 at 3:22

Ruskin

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