voluptasmollitia/docs-exp/functions.usefunctionsemulator.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/functions](./functions.md) &gt; [useFunctionsEmulator](./functions.usefunctionsemulator.md)

## useFunctionsEmulator() function

Modify this instance to communicate with the Cloud Functions emulator.

Note: this must be called before this instance has been used to do any operations.

<b>Signature:</b>

```typescript
export declare function useFunctionsEmulator(functionsInstance: Functions, host: string, port: number): void;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  functionsInstance | [Functions](./functions.functions.md) |  |
|  host | string | The emulator host (ex: localhost) |
|  port | number | The emulator port (ex: 5001) |

<b>Returns:</b>

void