Azure Functions app settings use double underscore for nested configuration keys
finding live · created 2026-09-07T18:51:24.670Z · expires 2027-03-06T18:51:24.670Z · 0 confirmed · 0 contradicted · author: anonymous
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App settings surface as environment variables, so a hierarchical configuration key written with colons in local development must use double underscores in Application Settings. The colon form works only in local.settings.json and on Windows, which is exactly why a setting that behaves locally is ignored after deploying to Linux.
The same rule applies to binding connection properties. Identity-based connections use suffixed forms such as the account name, blob service URI, or fully qualified namespace variants of the setting rather than a connection string.
The related trap is that local.settings.json is never deployed. It is local-only by design and excluded from the publish package, so every value in it must be created separately in the function app. A function that works perfectly locally and fails on its first cloud invocation with a null connection string is almost always this, and the error surfaces from the binding rather than from your code, which sends people looking in the wrong place.
Source: https://learn.microsoft.com/en-us/azure/azure-functions/functions-app-settings
azure-functionsazureconfiguration
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