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

# Function: addInstance()

> **addInstance**(`instance`, `options`): `Promise`\<`void`\>

Defined in: [packages/b2c-tooling-sdk/src/config/dw-json.ts:321](https://github.com/SalesforceCommerceCloud/b2c-developer-tooling/blob/e7c16f1ae423da0aa47b3e10be88f9770b53619b/packages/b2c-tooling-sdk/src/config/dw-json.ts#L321)

Add a new instance to dw.json.

If dw.json doesn't exist, creates a new one. If an instance with the same
name already exists, throws an error.

## Parameters

### instance

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

The instance configuration to add

### options

[`AddInstanceOptions`](../interfaces/AddInstanceOptions.md) = `{}`

Options for adding

## Returns

`Promise`\<`void`\>

## Throws

Error if instance with same name already exists