---
title: "Execute Function"
url: https://docs.catalyst.zoho.com/en/api/code-reference/serverless/functions/execute-function/
description: "This API enables you to execute a Catalyst Basic I/O function and pass input parameters as query string or in the request body."
last_updated: 2026-08-28T06:26:16Z
service: Serverless
type: api
---

# Functions

[Catalyst Functions](https://docs.catalyst.zoho.com/en/serverless/help/functions/introduction/) enable you to build custom functionalities in your application, and seamlessly integrate it with other Catalyst components to provide a powerful backend for it. You can automate tasks, perform memory-intensive computations, or integrate with third-party services using functions.

Catalyst offers support to develop server-side functions in Java, Node.js and Python programming environments.

> **Note:** You can create [six types of functions](https://docs.catalyst.zoho.com/en/serverless/help/functions/basic-io/) in Catalyst: Basic I/O, Advanced I/O, Cron, Event, Integration, and Browser Logic functions. However, you can only execute Basic I/O functions using this API.

# Execute a Function

### Description

This API enables you to execute a Basic I/O function by referring to its unique function ID. Basic I/O functions are used to perform basic input and output operations, computations, and simple HTTP operations.

Input parameters can be passed to the function in the API request either as a query string or in the request body. A query string is preferred over the request body to pass the function parameters in. The response will contain the function output.

> **Note:** The function must already be available in the remote console. You can [create a function in the console](https://docs.catalyst.zoho.com/en/serverless/help/functions/implementation/#create-a-function) directly, or create it in your local system and [deploy it to the console](https://docs.catalyst.zoho.com/en/cli/v1/deploy-resources/introduction/).

### Request Details

#### Request URL

`MULTIPLE` {api-domain}/baas/v1/project/{project_id}/function/{function_id}/execute

- **api-domain** (URL): The DC-specific domain to access Catalyst API

- **project_id** (Numerical): The [unique ID](https://docs.catalyst.zoho.com/en/getting-started/set-up-a-catalyst-project/general-settings/) of the project

- **function_id** (Numerical): The [unique ID](https://docs.catalyst.zoho.com/en/serverless/help/functions/implementation/#create-a-function) of the function

#### Request Methods

GET POST PUT DELETE

#### Request Headers
 **Authorization:** Zoho-oauthtoken {oauth_token}

**Optional Headers** 

 **CATALYST-ORG:** {org_id}

 **Environment:** Development

#### Scope

ZohoCatalyst.functions.EXECUTE

> **Note:** This operation can also be executed with Catalyst user authentication permissions using Catalyst SDKs. Refer to the [Catalyst API Prerequisites section](https://docs.catalyst.zoho.com/en/api/introduction/overview-and-prerequisites/#prerequisites) for details.

### Response Details

The response contains the output of the processed function. A Basic I/O function returns response in the JSON format. The key `output` contains the output generated by the function you execute.

**Sample Request**

```bash
curl -X POST \
https://api.catalyst.zoho.com/baas/v1/project/4000000006007/function/4000000045004/execute?name=Raymond%20McGregor \
-H "Authorization: Zoho-oauthtoken 1000.910*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*16.2f*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*57"

```

**Sample Response**

```json

	{
	"output": "Hello Raymond McGregor"
	}
```

### SDK Documentation

[Execute a Function- Java SDK](https://docs.catalyst.zoho.com/en/sdk/java/v1/serverless/functions/execute-function)</br></br>
[Execute a Function- Node.js SDK](https://docs.catalyst.zoho.com/en/sdk/nodejs/v2/serverless/functions/execute-function)</br></br>
[Execute a Function- Python SDK](https://docs.catalyst.zoho.com/en/sdk/python/v1/serverless/functions/execute-function)</br>

[Execute a Function- Web SDK](https://docs.catalyst.zoho.com/en/sdk/web/v4/serverless/functions/execute-function)