In case you don’t know (I had no idea), here it is – the location of your log files when using the ILogger interface for Azure Functions.

%temp%\LogFiles\Application\Functions

Once there, you will be able to drill into your functions by name and find the log file(s) associated with that function.

It’s also good practice to enable local file logging in your host.json file using the following syntax.

  "logging": {
    "fileLoggingMode": "always"
  }