---
title: Logging API
slug: commerce-connect-14/docs/logging
docTags: 
createdAt: 2026-07-23T10:25:33.704Z
---

Optimizely comes with a logging API, which is an abstraction for writing log messages from the system. Logging is useful when you troubleshoot and locate application problems.

Optimizely Commerce Connect uses `EPiServer.Logging`, which works as a façade for the logging framework in .NET Core (`Microsoft.Extensions.Logging`). To manage the configuration and output of the logger, refer to the API of the implementing framework, see [Logging in .NET Core](https://docs.microsoft.com/en-us/aspnet/core/fundamentals/logging/?view=aspnetcore-5.0).

The recommendation for custom logging in Optimizely is to use the logging API defined in .NET Core.