add build chat and quick start guides
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fryorcraken.eth
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---
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title: Build a Chat App
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---
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# Build a Chat App
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In this guide, you will learn how to receive and send messages using Waku by building an app from scratch.
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If you want to learn how to add Waku to an existing app, check the [Quick Start](./quick-start) guide.
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## Pre-Requisites
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### 1. Set up Project
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Setup a new npm package:
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```shell
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mkdir waku-app
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cd waku-app
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npm init -y
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```
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### 2. Set up Web Server
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Use the `serve` package as a web server
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```shell
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npm i -D serve
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```
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Add a `start` script to the `package.json` file:
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```json
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{
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"scripts": {
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"start": "serve ."
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}
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}
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```
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### 3. Create Files
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Finally, create empty files for your project:
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```shell
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touch index.html index.js
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```
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## Write Your App
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## 1. Add HTML Elements
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In `index.html`, add a button, text box and `div` for messages to have a basic chat app.
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Also, import the `index.js` file.
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```html title=index.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8"/>
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<meta content="width=device-width, initial-scale=1.0" name="viewport"/>
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<title>Waku Chat App</title>
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</head>
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<body>
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<label for="textInput">Message text</label>
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<input id="textInput" placeholder="Type your message here" type="text"/>
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<button disabled id="send" type="button">
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Send message using Light Push
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</button>
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<br/>
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<div id="messages"></div>
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<script src="./index.js" type="module"></script>
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</body>
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</html>
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```
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## 2. Access HTML Elements
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::: note
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From now on, all changes need to be done in the `index.js` file.
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:::
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Initialize variables to easily modify the HTML content:
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```js
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const sendButton = document.getElementById("send")
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const messagesDiv = document.getElementById("messages")
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const textInput = document.getElementById("textInput")
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```
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## 3. Start a Waku Node
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Create and start a Waku Node:
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```js
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import {createLightNode} from "https://unpkg.com/@waku/create@0.0.6/bundle/index.js"
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const wakuNode = await createLightNode({defaultBootstrap: true})
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await wakuNode.start()
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```
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:::info
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Setting the `defaultBootstrap` option to true allows your Waku node to connect to a set of pre-defined nodes.
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:::
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## 4. Wait for Connection to be Established
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Your Waku node needs to connect to a remote node in order to access the network.
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To wait for this, use the `waitForRemotePeer` function:
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```js
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import * as waku from "https://unpkg.com/@waku/core@0.0.10/bundle/index.js"
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await waku.waitForRemotePeer(wakuNode)
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```
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## 5. Define a Content Topic
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The `contentTopic` is a metadata `string` used for categorizing messages on the Waku network.
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Depending on your use case, you can create one or more new `contentTopic`(s).
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Refer to our [How to Choose a Content Topic](/overview/concepts/content-topics) guide more details.
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For this guide, we'll use `/chat-app-guide/1/message/utf8`.
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Note that our payload will be encoded using `utf-8`.
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We recommended using Protobuf for production purposes.
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```js
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const contentTopic = `/chat-app-guide/1/message/utf8`
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```
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## 6. Render Incoming Messages
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Let's store incoming messages in an array and create a function to render them in the `messages` div:
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```js
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const updateMessages = (msgs, div) => {
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div.innerHTML = "<ul>"
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msgs.forEach((msg) => (div.innerHTML += `<li>${msg}</li>`))
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div.innerHTML += "</ul>"
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};
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const messages = []
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```
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## 7. Create a Decoder
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Waku supports various encryption protocols.
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A decoder allows you to specify the content topic to use and how to decrypt messages.
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For the chosen content topic, create a plain text decoder (without encryption):
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```js
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const decoder = waku.createDecoder(contentTopic)
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```
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## 8. Listen for Incoming Messages
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Messages sent over the network are `Waku Message`s,
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as defined in the [14/WAKU2-MESSAGE](https://rfc.vac.dev/spec/14/#wire-format) RFC.
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Messages returned by the plain text decoder implement the [`DecodedMessage`](https://js.waku.org/classes/_waku_core.DecodedMessage.html) interface.
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For now, we will just use the `payload` field.
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It is a byte array field that can be used to encode any data.
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We will store messages as a `utf-8` string.
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Listen to messages using the decoder and add them to the `messages` div upon reception:
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```ts
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import * as utils from "https://unpkg.com/@waku/utils@0.0.10/bundle/index.js"
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wakuNode.filter.subscribe([decoder], (message) => {
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const str = utils.bytesToUtf8(message.payload)
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messages.push(str)
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updateMessages(messages, messagesDiv);
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})
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```
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## 9. Send Messages
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Finally, create a plain text encoder and set up the `send` button to send messages.
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Users will be able to enter the message using the `textInput` div.
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Once done, we can enable the `send` button.
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```ts
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const encoder = waku.createEncoder(contentTopic)
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sendButton.onclick = async () => {
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const text = textInput.value;
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await wakuNode.lightPush.push(encoder, {
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payload: utils.utf8ToBytes(text),
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});
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textInput.value = null;
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};
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sendButton.disabled = false
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```
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### 10. Run the App
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You can now start a local web server to run the app:
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```shell
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npm start
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```
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Click on the link in the console (http://localhost:3000/) and send a message!
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You can open your app in several tabs to see messages being sent around.
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## Conclusion
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Congratulations on building your first Waku chat app. You can find the complete files below:
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```html title=index.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8"/>
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<meta content="width=device-width, initial-scale=1.0" name="viewport"/>
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<title>JS-Waku Quick Start App</title>
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</head>
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<body>
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<label for="textInput">Message text</label>
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<input id="textInput" placeholder="Type your message here" type="text"/>
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<button disabled id="send" type="button">
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Send message using Light Push
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</button>
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<br/>
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<div id="messages"></div>
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<script src="./index.js" type="module"></script>
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</body>
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</html>
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```
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```js title=index.js
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import {createLightNode} from "https://unpkg.com/@waku/create@0.0.6/bundle/index.js"
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import * as waku from "https://unpkg.com/@waku/core@0.0.10/bundle/index.js"
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import * as utils from "https://unpkg.com/@waku/byte-utils@0.0.2/bundle/index.js"
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const sendButton = document.getElementById("send")
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const messagesDiv = document.getElementById("messages")
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const textInput = document.getElementById("textInput")
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const wakuNode = await createLightNode({defaultBootstrap: true})
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await wakuNode.start()
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await waku.waitForRemotePeer(wakuNode)
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const contentTopic = `/chat-app-guide/1/message/utf8`
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const decoder = waku.createDecoder(contentTopic)
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const updateMessages = (msgs, div) => {
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div.innerHTML = "<ul>"
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msgs.forEach((msg) => (div.innerHTML += "<li>" + msg + "</li>"))
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div.innerHTML += "</ul>"
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};
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const messages = []
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wakuNode.filter.subscribe([decoder], (message) => {
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const str = utils.bytesToUtf8(message.payload)
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messages.push(str)
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updateMessages(messages, messagesDiv);
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})
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const encoder = waku.createEncoder(contentTopic)
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sendButton.onclick = async () => {
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const text = textInput.value;
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await wakuNode.lightPush.push(encoder, {
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payload: utils.utf8ToBytes(text),
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});
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textInput.value = null;
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};
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sendButton.disabled = false
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```
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@ -0,0 +1,115 @@
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---
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title: Quick Start
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date: 2021-12-09T14:00:00+01:00
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weight: 20
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---
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# Quick Start
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In this guide, you will learn how to integrate Waku into an **existing** JavaScript project.
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If you're looking to build a Waku app from scratch, check out our [Build a Chat App](./build-chat-app.md) guide.
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## 1. Install Waku Libraries
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To begin, install the required Waku libraries with the following command:
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```shell
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npm i @waku/core @waku/create @waku/utils
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```
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## 2. Start a Waku Node
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Next, create and start a Waku Node:
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```js
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import {createLightNode} from "@waku/create"
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const waku = await createLightNode({defaultBootstrap: true})
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await waku.start()
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```
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:::info
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Setting the `defaultBootstrap` option to true allows your Waku node to connect to a set of pre-defined nodes.
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:::
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## 3. Wait for Connection to be Established
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Your Waku node needs to connect to a remote node in order to access the network.
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To wait for this, use the `waitForRemotePeer` function:
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```js
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import * as waku from "@waku/core"
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await waku.waitForRemotePeer(wakuNode)
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```
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## 4. Define a Content Topic
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The `contentTopic` is a metadata `string` used for categorizing messages on the Waku network.
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Depending on your use case, you can create one or more new `contentTopic`(s).
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Refer to our [How to Choose a Content Topic](/overview/concepts/content-topics) guide more details.
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For this guide, we'll use `/quick-start/1/message/utf8`.
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Note that our payload will be encoded using `utf-8`.
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We recommended using Protobuf for production purposes.
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```js
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const contentTopic = `/quick-start/1/message/utf8`
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```
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## 5. Create a Decoder
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Waku supports various encryption protocols.
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A decoder allows you to specify the content topic to use and how to decrypt messages.
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For the chosen content topic, create a plain text decoder (without encryption):
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```js
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const decoder = waku.createDecoder(contentTopic)
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```
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## 6. Listen for Incoming Messages
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Messages sent over the network are `Waku Message`s,
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as defined in the [14/WAKU2-MESSAGE](https://rfc.vac.dev/spec/14/#wire-format) RFC.
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Messages returned by the plain text decoder implement the [`DecodedMessage`](https://js.waku.org/classes/_waku_core.DecodedMessage.html) interface.
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For now, we will just use the `payload` field.
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It is a byte array field that can be used to encode any data.
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We will store messages as a `utf-8` string.
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To listen for messages using the decoder, use the following code:
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```js
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wakuNode.filter.subscribe([decoder], (message) => {
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const str = utils.bytesToUtf8(message.payload)
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// str is a string, render it in your app as desired
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})
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```
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## 7. Send Messages
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Finally, create a `sendMessage` function that sends messages over Waku:
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```js
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import * as utils from "@waku/utils"
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const encoder = waku.createEncoder(contentTopic)
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const sendMessage = async (textMsg) => {
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await wakuNode.lightPush.push(encoder, {
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payload: utils.utf8ToBytes(textMsg),
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});
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};
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```
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Now, you can use the `sendMessage` function in your app to send messages.
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## Conclusion
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Congratulations! You've successfully added decentralized communication features to your app.
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Continue learning by exploring how to [build a chat app](./build-chat-app) from scratch using Waku.
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@ -30,7 +30,9 @@ const sidebars = {
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},
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],
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browser: [
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"browser/introduction"
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"browser/introduction",
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"browser/quick-start",
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"browser/build-chat-app",
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]
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};
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