---
title: "Event Filter"
slug: "dataflow-nodes-event-filter"
updated: 2025-09-29T07:41:37Z
published: 2025-09-29T07:41:37Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.knovvu.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Event Filter

Event Filter node, filters through incoming events.

## Parameters

| name | description | default |
| --- | --- | --- |
| List Type | Either **Block List** or **Allow List**. |  |
| Event Filter Type | Either **Tag** or **Event Name**. | Event Name |
| Event Or Tag Names | Semicolon separated names of the events or tags that will be filtered. |  |

          Example

          

Using the parameters **Allow List**, **Event Name**, and **SR Milestone; Translate** will make sure that only *SR Milestone* and *Translate* events will *pass through* while the **others** are *blocked*.

          Example

          

Using the parameters **Block List**, **Tag**, and **Source** will make the node **block all events** that have the tag **Source**;

## Inputs

### Audio

none

### Events

All

## Outputs

### Audio

none

### Events

All

## Remarks

### Project Structure

In the figures below, two event filter nodes are used. The top one allows only events named **Chat Message**, and the one below allows all events that don't have the name **Chat Message**. This way the Chat Message events aren't duplicated on the CA Realtime node, and other events such as [CallStateUpdate](/v1/docs/dataflow-events#callstateupdate) can freely reach the CA Realtime node.

This is useful since all events that contain a Text field pass through the Text Correction node while the others are blocked.

![image.png](https://cdn.document360.io/9bca2910-6a3b-4224-9470-43f91f9a6d57/Images/Documentation/image-WC4L2NLC.png)

![image.png](https://cdn.document360.io/9bca2910-6a3b-4224-9470-43f91f9a6d57/Images/Documentation/image-8Y3RNTIV.png)

![image.png](https://cdn.document360.io/9bca2910-6a3b-4224-9470-43f91f9a6d57/Images/Documentation/image-E9U6BZBC.png)

### Supported flow types

Stream, Batch

## Release Notes

        

****v4.4.0****

            
            

- Introduced node.