​
React Hooks

The @chainlit/react-client package provides several React hooks to manage various aspects of your chat application seamlessly:

  • useChatSession: Manages the chat session’s connection to the WebSocket server.
  • useChatMessages: Manages retrieval and rendering of chat messages.
  • useChatData: Accesses chat-related data and states.
  • useChatInteract: Provides methods to interact with the chat system.
  • useAuth: Handles authentication processes.
  • useApi: Simplifies API interactions with built-in support for data fetching and error handling.

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useChatSession Hook

This hook is responsible for managing the chat session’s connection to the WebSocket server.

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Methods

  • connect: Establishes a connection to the WebSocket server.
  • disconnect: Disconnects from the WebSocket server.
  • setChatProfile: Sets the chat profile state.

​
Example

import { useChatSession } from '@chainlit/react-client';

const ChatComponent = () => {
  const { connect, disconnect, chatProfile, setChatProfile } = useChatSession();

  // Connect to the WebSocket server
  useEffect(() => {
    connect({
      userEnv: {
        /* user environment variables */
      },
      accessToken: 'Bearer YOUR ACCESS TOKEN', // Optional Chainlit auth token
    });

    return () => {
      disconnect();
    };
  }, []);

  // Rest of your component logic
};

​
useChatMessages Hook

The useChatMessages hook provides access to the current chat messages, the first user interaction, and the active thread ID within your React application. It leverages Recoil for state management, ensuring that your components reactively update in response to state changes.

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Returned Values

  • threadId (string | undefined):
    The identifier of the current chat thread.
  • messages (IStep[]):
    An array of chat messages.
  • firstInteraction (string | undefined):
    The content of the first user-initiated interaction.

​
Example

import { useChatMessages } from '@chainlit/react-client';

const MessagesComponent = () => {
  const { messages, firstInteraction, threadId } = useChatMessages();

  return (
    <div>
      <h2>Thread ID: {threadId}</h2>
      {firstInteraction && <p>First Interaction: {firstInteraction}</p>}
      {messages.map((message) => (
        <p key={message.id}>{message.content}</p>
      ))}
    </div>
  );
};

​
useChatData Hook

The useChatData hook offers comprehensive access to various chat-related states and data within your React application.

​
Returned Properties

  • actions (IAction[])
  • askUser (IAsk | undefined)
  • chatSettingsValue (any)
  • connected (boolean)
  • disabled (boolean)
  • error (boolean | undefined)
  • loading (boolean)
  • tasklists (ITasklistElement[])

​
Example

import { useChatData } from '@chainlit/react-client';

const ChatStatusComponent = () => {
  const { connected, loading, error, actions, askUser, chatSettingsValue } = useChatData();

  return (
    <div>
      <h2>Chat Status</h2>
      {loading && <p>Loading chat...</p>}
      {error && <p>There was an error with the chat session.</p>}
      <p>{connected ? 'Connected to chat.' : 'Disconnected from chat.'}</p>

      <h3>Available Actions</h3>
      <ul>
        {actions.map((action) => (
          <li key={action.id}>{action.name}</li>
        ))}
      </ul>

      {askUser && (
        <div>
          <h3>User Prompt</h3>
          <p>{askUser.message}</p>
        </div>
      )}

      <h3>Chat Settings</h3>
      <pre>{JSON.stringify(chatSettingsValue, null, 2)}</pre>
    </div>
  );
};

​
useChatInteract Hook

The useChatInteract hook provides a comprehensive set of methods to interact with the chat system within your React application.

​
Methods

  • sendMessage
  • replyMessage
  • clear
  • uploadFile
  • callAction
  • startAudioStream
  • sendAudioChunk
  • stopTask

​
Example

import { useChatInteract } from '@chainlit/react-client';

const ChatInteraction = () => {
  const { sendMessage, replyMessage, clear } = useChatInteract();

  return (
    <div>
      <button onClick={() => sendMessage({ content: 'Hello!' })}>Send</button>
      <button onClick={() => replyMessage({ content: 'Reply!' })}>Reply</button>
      <button onClick={clear}>Clear</button>
    </div>
  );
};

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useAuth Hook

The useAuth hook manages authentication within your React application, providing functionalities like user sessions and token management.

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Properties & Methods

  • authConfig
  • user
  • accessToken
  • isLoading
  • logout

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Example

import { useAuth } from '@chainlit/react-client';

const UserProfile = () => {
  const { user, logout } = useAuth();

  if (!user) return <p>No user logged in.</p>;

  return (
    <div>
      <p>Username: {user.username}</p>
      <button onClick={logout}>Logout</button>
    </div>
  );
};

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useApi Hook

The useApi hook simplifies data fetching and error handling using SWR.

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Example

import { useApi } from '@chainlit/react-client';

const Settings = () => {
  const { data, error, isLoading } = useApi('/project/settings');

  if (isLoading) return <p>Loading...</p>;
  if (error) return <p>Error: {error.message}</p>;

  return <pre>{JSON.stringify(data, null, 2)}</pre>;
};

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