How do I configure the dotnet Console logger to not emit the log level?

Question

I am using the stock standard console logger, however it is unuseful for me to have info: at the start of each line - how can I remove this via config?

2025-02-28T00:02:10.553Z info: Scope.Scope.Scope[0] blah blah blah

Here is my current appsettings.json:

{
  "Logging": {
    "Console": {
      "FormatterName": "simple",
      "FormatterOptions": {
        "SingleLine": true,
        "TimestampFormat": "yyyy-MM-ddTHH:MM:ss.fffZ ",
        "UseUtcTimestamp": true,
        "JsonWriterOptions": {
          "Indented": true
        },
        "IncludeScopes": false
      }
    }
  }

Answer 1

Hi @catmanjan , Welcome to Microsoft Q&A,

You can remove the info: prefix from the console log output via a custom log formatter. The commonly used simple formatter does not allow you to directly remove the log level prefix.

using System;
using System.IO;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Console;

public class CustomConsoleFormatter : ConsoleFormatter
{
    public CustomConsoleFormatter() : base("custom")
    {
    }

    public override void Write<TState>(in LogEntry<TState> logEntry, IExternalScopeProvider scopeProvider, TextWriter textWriter)
    {
        var timestamp = DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ss.fffZ");
        textWriter.WriteLine($"{timestamp} {logEntry.State}");
    }
}

Add the formatter in Program.cs

builder.Logging.AddConsoleFormatter<CustomConsoleFormatter, ConsoleFormatterOptions>();

Edit appsettings.json

{
  "Logging": {
    "Console": {
      "FormatterName": "custom"
    }
  }
}

You can also check out the official documentation examples: Logging in C# and .NET

Best Regards,

Jiale

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