[Mavvie]

Awesome overview, stuff like this is often hard for newcomers to find/figure out. I'm sure it's in the docs somewhere but people often miss it.

One nitpick: environment vars don't have to be capitalized. You can do ConnectionStrings__MyConnection so the casing matches what you see in appsettings.json.

And a word of warning: make sure to understand how the configuration overrides work. If you have appsettings.json define an array of auth servers with 5 elements, then in appsettings.Production.json (or env variables) define an array of auth servers with only 1, auth servers 2-5 from the default appsettings.json will still be there! (something similar to this may or may not have caused a scare in the past)

[Merad]

Yep, it really just works with key/value pairs, so config overrides happen to individual keys. The config system itself doesn't really have a concept of nested objects or arrays. The config provider that reads the json file takes the path, like JobSettings[0].JobName, and transforms it into into a key like JobSettings:0:JobName (IIRC).

I tend to avoid using arrays in config because of the unexpected behavior, and the risk of overriding something you didn't mean to. Anywhere you'd use an array you can usually use an object and bind it to a Dictionary<string, Whatever>, then ignore the keys.

[NicoJuicy]

Word of caution. Azure functions implements appSettings differently.