---
title: "Why do I get an empty request body to my Advanced I/O function when the function URL is hit?"
url: https://docs.catalyst.zoho.com/en/faq/serverless/functions-empty-req-body/
description: "You have to use the appropriate body parser for the input type that you pass, to get the data in the request body in your Catalyst function."
last_updated: 2026-11-13T05:00:22Z
service: Serverless
type: faq
---

You have to use the appropriate body parser for the input type that you pass, to get the data in the request body in your Catalyst function.