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[@salesforce/b2c-tooling-sdk](../../modules.md) / [config](../index.md) / writeConfigField

# Function: writeConfigField()

> **writeConfigField**(`config`, `field`, `value`): `Promise`\<[`ConfigUpdateResult`](../interfaces/ConfigUpdateResult.md) & `object`\>

Defined in: [packages/b2c-tooling-sdk/src/config/config-write.ts:328](https://github.com/SalesforceCommerceCloud/b2c-developer-tooling/blob/36eea0d308f1312d1a446ec8813ed30b0bdba62c/packages/b2c-tooling-sdk/src/config/config-write.ts#L328)

Set or remove (`value === undefined`) a field at the source that supplies it.

## Parameters

### config

[`ResolvedB2CConfig`](../interfaces/ResolvedB2CConfig.md)

### field

keyof [`NormalizedConfig`](../interfaces/NormalizedConfig.md)

### value

`unknown`

## Returns

`Promise`\<[`ConfigUpdateResult`](../interfaces/ConfigUpdateResult.md) & `object`\>

## Throws

ConfigWriteError when the field has no writable target