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

# Mark conversation as read

> Mark messages in a conversation as read up to a given message

## Overview

Returns an async function that marks a conversation as read up to a specific message. The unread count for the conversation is cleared in Redux immediately (optimistic update). The server is then notified to advance the user's `lastReadAt` timestamp.

<Note>Requires `ChatProvider` in the component tree.</Note>

## Usage Example

```tsx theme={null}
import { useMarkConversationAsRead } from "@replyke/react-js";
import { useEffect } from "react";

function ConversationView({
  conversationId,
  messages,
}: {
  conversationId: string;
  messages: { id: string }[];
}) {
  const mark = useMarkConversationAsRead({ conversationId });

  useEffect(() => {
    const lastMessage = messages[messages.length - 1];
    if (lastMessage) {
      mark({ messageId: lastMessage.id });
    }
  }, [messages]);

  // ...
}
```

## Props

<ParamField body="conversationId" type="string" required>
  The ID of the conversation to mark as read.
</ParamField>

## Parameters

The hook returns a function. That function accepts:

<ParamField body="messageId" type="string" required>
  The ID of the message to mark as read up to. The server sets `lastReadAt` to this message's `createdAt`.
</ParamField>

## Returns

`Promise<void>`

## Notes

* The failure to mark as read on the server (e.g. network error) is non-critical. The local Redux count is already cleared and will re-sync on the next `ChatProvider` mount.
* For integration guidance, see [Chat: Real-time](/sdk/chat/real-time).