# Function: prefixForSubField()

> **prefixForSubField**(`prefix`, `fieldName`): `string`

Defined in: [packages/bitbadgesjs-sdk/src/eip712/sanitize.ts:43](https://github.com/BitBadges/bitbadgesjs/blob/master/packages/bitbadgesjs-sdk/src/eip712/sanitize.ts#L43)

## Parameters

### prefix

`string`

### fieldName

`string`

## Returns

`string`