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

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---
layout: default
title: string_converter
parent: Processors
grand_parent: Pipelines
nav_order: 105
---
# string_converter
The `string_converter` processor converts a string to uppercase or lowercase. You can use it as an example for developing your own processor. The following table describes the option you can use to configure the `string_converter` processor.
Option | Required | Type | Description
:--- | :--- | :--- | :---
upper_case | No | Boolean | Whether to convert to uppercase (`true`) or lowercase (`false`).
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## Metrics
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