Build React DApps Using @waku/react

The @waku/react package provides components and UI adapters to integrate @waku/sdk into React applications effortlessly. This guide provides detailed steps for using @waku/react in your project.

Install the dependencies

First, set up a project using any production-grade React framework or an existing React application. For this guide, we will create a boilerplate using ViteJS:

NPM

npm create vite@latest [PROJECT DIRECTORY] -- --template react

Yarn

yarn create vite [PROJECT DIRECTORY] --template react

Next, install the required libraries for integrating @waku/sdk using your preferred package manager:

NPM

npm install @waku/react @waku/sdk protobufjs

Yarn

yarn add @waku/react @waku/sdk protobufjs

Initialise the Waku provider

In the main.jsx file, which serves as the entry point for a React app, we will set up the LightNodeProvider context provider to wrap the entire application within the Waku provider. Import the following on top of your file:

src/main.jsx

import { LightNodeProvider } from "@waku/react";

// Set the Light Node options
const NODE_OPTIONS = { defaultBootstrap: true };

ReactDOM.createRoot(document.getElementById('root')).render(
  // Use the Light Node context provider
  <React.StrictMode>
    <LightNodeProvider options={NODE_OPTIONS}>
      <App />
    </LightNodeProvider>
  </React.StrictMode>,
)

Next, create and start a Light Node using the useWaku() function within the App.jsx file:

src/App.jsx

import { useWaku } from "@waku/react";

function App() {
    // Create and start a Light Node
    const { node, error, isLoading } = useWaku();

    // "node" is the created Light Node
    // "error" captures any error that occurs during node creation
    // "isLoading" indicates whether the node is still being created
}

Build the application interface

Let's build a user interface for sending messages and viewing past messages, modify the App.jsx file with the following code block:

src/App.jsx

import { useState, useEffect } from 'react';
import { useWaku } from "@waku/react";
import { createEncoder, createDecoder } from "@waku/sdk";
import protobuf from 'protobufjs';
import './App.css'

function App() {
    const [inputMessage, setInputMessage] = useState("");
    const [messages, setMessages] = useState([]);

    // Update the inputMessage state as the user input changes
    const handleInputChange = (e) => {
        setInputMessage(e.target.value);
    };

    // Create and start a Light Node
    const { node, error, isLoading } = useWaku();

    // Create a message encoder and decoder
    const contentTopic = "/waku-react-guide/1/chat/proto";
    const encoder = createEncoder({ contentTopic });
    const decoder = createDecoder(contentTopic);

    // Create a message structure using Protobuf
    const ChatMessage = new protobuf.Type("ChatMessage")
        .add(new protobuf.Field("timestamp", 1, "uint64"))
        .add(new protobuf.Field("message", 2, "string"));

    // Send the message using Light Push
    const sendMessage = async () => {}

    return (
        <>
            <div className="chat-interface">
                <h1>Waku React Demo</h1>
                <div className="chat-body">
                    {messages.map((message, index) => (
                        <div key={index} className="chat-message">
                            <span>{new Date(message.timestamp).toUTCString()}</span>
                            <div className="message-text">{message.message}</div>
                        </div>
                    ))}
                </div>
                <div className="chat-footer">
                    <input
                        type="text"
                        id="message-input"
                        value={inputMessage}
                        onChange={handleInputChange}
                        placeholder="Type your message..."
                    />
                    <button className="send-button" onClick={sendMessage}>Send</button>
                </div>
            </div>
        </>
    )
}

export default App

info

In the code above, we also created a message encoder and decoder using the createEncoder() and createDecoder() functions, along with the application message structure with Protobuf.

Next, modify the App.css file with the following code block:

src/App.css

#root {
    margin: 0 auto;
}

.chat-interface {
    display: flex;
    flex-direction: column;
    height: 100vh;
    border: 1px solid #ccc;
}

.chat-body {
    flex-grow: 1;
    overflow-y: auto;
    padding: 10px;
}

.message-text {
    background-color: #f1f1f1;
    color: #000;
    padding: 10px;
    margin-bottom: 10px;
}

.chat-footer {
    display: flex;
    padding: 10px;
    background-color: #f1f1f1;
    align-items: center;
}

#message-input {
    flex-grow: 1;
    border-radius: 4px;
    padding: 10px;
    margin-right: 10px;
}

.send-button {
    background-color: #007bff;
    border-radius: 4px;
}

Send messages using light push

To send messages in our application, we need to modify the sendMessage() function to serialize user input into our Protobuf structure and push it to the network using the useLightPush() function:

src/App.jsx

import { useLightPush } from "@waku/react";

function App() {
    // Bind push method to a node and encoder
    const { push } = useLightPush({ node, encoder });

    // Send the message using Light Push
    const sendMessage = async () => {
        if (!push || inputMessage.length === 0) return;

        // Create a new message object
        const timestamp = Date.now();
        const protoMessage = ChatMessage.create({
            timestamp: timestamp,
            message: inputMessage
        });

        // Serialise the message and push to the network
        const payload = ChatMessage.encode(protoMessage).finish();
        const { recipients, errors } = await push({ payload, timestamp });

        // Check for errors
        if (errors.length === 0) {
            setInputMessage("");
            console.log("MESSAGE PUSHED");
        } else {
            console.log(errors);
        }
    };
}

Receive messages using filter

To display messages in our application, we need to use the useFilterMessages() function to create a Filter subscription, receive incoming messages, and render them in our interface:

src/App.jsx

import { useFilterMessages } from "@waku/react";

function App() {
    // Receive messages from Filter subscription
    const { messages: filterMessages } = useFilterMessages({ node, decoder });

    // Render the list of messages
    useEffect(() => {
        setMessages(filterMessages.map((wakuMessage) => {
            if (!wakuMessage.payload) return;
            return ChatMessage.decode(wakuMessage.payload);
        }));
    }, [filterMessages]);
}

Retrieve messages using store

To display messages from the past, we need to retrieve them from the Store protocol using the useStoreMessages() function when our application initialises and then render them alongside newly received messages:

src/App.jsx

import { useFilterMessages, useStoreMessages } from "@waku/react";

function App() {
    // Query Store peers for past messages
    const { messages: storeMessages } = useStoreMessages({ node, decoder });

    // Receive messages from Filter subscription
    const { messages: filterMessages } = useFilterMessages({ node, decoder });

    // Render both past and new messages
    useEffect(() => {
        const allMessages = storeMessages.concat(filterMessages);
        setMessages(allMessages.map((wakuMessage) => {
            if (!wakuMessage.payload) return;
            return ChatMessage.decode(wakuMessage.payload);
        }));
    }, [filterMessages, storeMessages]);
}

info

To explore the available Store query options, have a look at the Retrieve Messages Using Store Protocol guide.

tip

You have successfully integrated @waku/sdk into a React application using the @waku/react package. Have a look at the web-chat example for a working demo.