# Publishers.Print A publisher that prints log messages for all publishing events, optionally prefixed with a given string. ``` struct Print where Upstream : Publisher ``` ## Overview This publisher prints log messages when receiving the following events: - subscription - value - normal completion - failure - cancellation ## Topics ### Creating a print publisher [`init(upstream:prefix:to:)`](/documentation/Combine/Publishers/Print/init(upstream:prefix:to:)) Creates a publisher that prints log messages for all publishing events. ### Declaring supporting types [`Publishers.Print.Output`](/documentation/Combine/Publishers/Print/Output) The kind of values published by this publisher. [`Publishers.Print.Failure`](/documentation/Combine/Publishers/Print/Failure) The kind of errors this publisher might publish. ### Inspecting publisher properties [`upstream`](/documentation/Combine/Publishers/Print/upstream) The publisher from which this publisher receives elements. [`prefix`](/documentation/Combine/Publishers/Print/prefix) A string with which to prefix all log messages. [`stream`](/documentation/Combine/Publishers/Print/stream) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)