---
title: "init(upstream:decoder:)"
framework: combine
role: symbol
role_heading: Initializer
path: "combine/publishers/decode/init(upstream:decoder:)"
---

# init(upstream:decoder:)

Creates a publisher that decodes elements received from an upstream publisher, using a given decoder.

## Declaration

```swift
init(upstream: Upstream, decoder: Coder)
```

## Parameters

- `upstream`: The publisher from which this publisher receives elements.
- `decoder`: The decoder that decodes elements received from the upstream publisher.