Octo variable substitution on appsetttings.json nested objects


So I have an appsettings.json file in one of my .net core apps, and it has a section of JSON which is an array of unnamed objects, all of which I want to replace the same variable, “minLevel”

"NLog": {
 "rules": [
        "logger": "*",
        "minLevel": "Info",
        "writeTo": "Splunk",
        "filterDefaultAction": "Log",
        "logger": "*",
        "minLevel": "Info",
        "writeTo": "Console"

So in Octo what I have right now for a variable substitution is


But this doesn’t do the trick. What exactly IS the syntax to search through all those nodes and replace ALL the minValue values with a given value?


Hi Chris,

Thanks for getting in touch! Octopus expects a zero-based index identifier when replacing objects in a JSON array. So you will need to create two variables to edit the minLevel for both of these nested objects.

Variable Value
NLog:rules:0:minLevel NewValue
NLog:rules:1:minLevel NewValue

Our documentation on structured configuration variables covers this with some example. As a note, I just did a quick test with wildcard indexing and can confirm that it doesn’t work. Hence the need for a unique variable for each index in the array.

Let me know if this helps, and if you have any questions at all, don’t hesitate to ask.

Best regards,

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