opensearch-docs-cn/_data-prepper/pipelines/configuration/processors/trim-string.md

---
layout: default
title: trim_string
parent: Processors
grand_parent: Pipelines
nav_order: 45
---

# trim_string

## Overview

Strips whitespace from the beginning and end of a key. `trim_string` is part of [mutate string](https://github.com/opensearch-project/data-prepper/tree/main/data-prepper-plugins/mutate-string-processors#mutate-string-processors) processors.

Option | Required | Type | Description
:--- | :--- | :--- | :---
with_keys | Yes | List | A list of keys to trim the whitespace from.

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## Metrics

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