---
url: "https://vueda.dev/v3/reference/api/js/use/useModelInitialValues/functions/mergeModelInitialValuesMappings.md"
title: "mergeModelInitialValuesMappings"
---

# mergeModelInitialValuesMappings

## Overview

Merge custom field initial value mappings into the default set used for forms.

## Signature

`mergeModelInitialValuesMappings(customMappings)`

### Parameters

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| <span id="param-customMappings">customMappings</span> | `object` | yes | Additional mappings keyed by field type. |

### Returns

`The updated initial value field mappings.`

## Source

`client/lib/use/useModelInitialValues.js:104`