---
title: "Create a Function Instance"
url: https://docs.catalyst.zoho.com/en/sdk/flutter/v2/serverless/functions/create-function-instance/
description: "Catalyst functions enable you to build custom functionalities in your application, automate tasks, or integrate with third-party services."
last_updated: 2025-11-19T15:07:41Z
service: Serverless
type: general
related_links:
  - name: "Functions"
    url: /en/serverless/help/functions/introduction
  - name: "Function - API"
    url: /en/api/code-reference/serverless/functions/execute-function/#ExecuteFunction
---

# Functions

[Catalyst Serverless Functions](https://docs.catalyst.zoho.com/en/serverless/help/functions/introduction) enable you to build custom functionalities in your application, automate tasks, or integrate with third-party services. You can develop functions for your mobile app from the Catalyst console or the CLI.

> **Note**: You can create six types of functions in Catalyst: Basic I/O, Advanced I/O, Cron, Event, Integration, and Browser Logic functions. However, you can only execute Basic I/O functions in Catalyst Flutter SDK. 

### Create a Function Instance

You can create an instance of a Catalyst function using the `getFunctionInstance()` method, method, and enable the methods defined in this class to access the instance object. This will prevent unnecessary server calls.

The function instance can be fetched in two different ways. 

### By passing the Function ID

You can create a function instance by passing the ID of the function as an argument to the `getFunctionInstance()` method in the String format as shown in the syntax below:

```bash
ZCatalystApp.getInstance().getFunctionInstance(
    String identifier
)
```

**Parameters**:

* `functionID`: The unique [ID](https://docs.catalyst.zoho.com/en/serverless/help/functions/introduction) of the function configured in Catalyst

A sample code snippet is shown below:

```bash
ZCatalystFunction function = ZCatalystApp.getInstance().getFunctionInstance(identifier: "158798998356682");
```

### By passing the API name of the function

You can create a function instance by passing the API name of the function as an argument to the `getFunctionInstance()` method in the String format as shown in the syntax below:

```bash
ZCatalystApp.getInstance().getFunctionInstance(
    String identifier
)
```

**Parameters**:

* `identifier`: The name of the function configured in Catalyst

A sample code snippet is shown below:

```bash
ZCatalystFunction function = ZCatalystApp.getInstance().getFunctionInstance(identifier: "LocalBackUp");
```