firebase-js-sdk/docs-devsite/ai.functioncall.md

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# FunctionCall interface
A predicted [FunctionCall](./ai.functioncall.md#functioncall_interface) returned from the model that contains a string representing the [FunctionDeclaration.name](./ai.functiondeclaration.md#functiondeclarationname) and a structured JSON object containing the parameters and their values.

<b>Signature:</b>

```typescript
export interface FunctionCall 
```

## Properties

|  Property | Type | Description |
|  --- | --- | --- |
|  [args](./ai.functioncall.md#functioncallargs) | object |  |
|  [id](./ai.functioncall.md#functioncallid) | string | The id of the function call. This must be sent back in the associated [FunctionResponse](./ai.functionresponse.md#functionresponse_interface)<!-- -->. |
|  [name](./ai.functioncall.md#functioncallname) | string |  |

## FunctionCall.args

<b>Signature:</b>

```typescript
args: object;
```

## FunctionCall.id

The id of the function call. This must be sent back in the associated [FunctionResponse](./ai.functionresponse.md#functionresponse_interface)<!-- -->.

This property is only supported in the Gemini Developer API ([GoogleAIBackend](./ai.googleaibackend.md#googleaibackend_class)<!-- -->). When using the Gemini Developer API ([GoogleAIBackend](./ai.googleaibackend.md#googleaibackend_class)<!-- -->), this property will be `undefined`<!-- -->.

<b>Signature:</b>

```typescript
id?: string;
```

## FunctionCall.name

<b>Signature:</b>

```typescript
name: string;
```