---
title: Combination Processor
slug: litmusedge/combination-processor
docTags: 
createdAt: 2024-08-06T19:34:28.009Z
---

The Combination Processor combines fields from different input processors into a single JSON string.

## Why use the Combination Processor

Use this processor when a flow needs to merge data that arrives through separate input processors into one output payload, rather than processing each input's fields independently.

## How it works

After you create the Combination Processor, add a definition to the connecting wire. Reference each field you want to combine as `<wire definition>_<fieldName>`, using the name you gave the wire definition.

## Parameters

| **Parameter**           | **Details**                                                                                            |
| ----------------------- | ------------------------------------------------------------------------------------------------------ |
| Combination Type        | Choose whether to combine selected fields only, or all fields, from the different input processors.    |
| What Timestamp to Take? | The input processor whose timestamp is included in the combined output.                                |
| Fields to Combine       | The fields to combine into a single JSON string, separated by commas.                                  |
| Pass Through Value      | Determines whether the processor's output is the combined value or the original unchanged input value. |

## Related topics

- [Use the Combination Processor Function](docId\:bwhf30laj2z81-E36e2ft)