# Just A publisher that emits an output to each subscriber just once, and then finishes. ``` struct Just

``` ## Overview You can use a [`Just`](/documentation/Combine/Just) publisher to start a chain of publishers. A [`Just`](/documentation/Combine/Just) publisher is also useful when replacing a value with [`Publishers.Catch`](/documentation/Combine/Publishers/Catch). In contrast with , a [`Just`](/documentation/Combine/Just) publisher can’t fail with an error. And unlike , a [`Just`](/documentation/Combine/Just) publisher always produces a value. ## Topics ### Creating a just ublisher [`init(_:)`](/documentation/Combine/Just/init(_:)) Initializes a publisher that emits the specified output just once. ### Inspecting publisher properties [`output`](/documentation/Combine/Just/output) The one element that the publisher emits. ### Comparing publishers [`==(_:_:)`](/documentation/Combine/Just/==(_:_:)) Returns a Boolean value that indicates whether two publishers are equivalent. ### Applying operators [Publisher Operators](/documentation/Combine/Just-Publisher-Operators) Methods that create downstream publishers or subscribers to act on the elements they receive. --- 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)