### Install node-zalo-bot

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

Installs the node-zalo-bot package using npm. This is the first step to integrate the library into your Node.js project.

```bash
npm install node-zalo-bot
```

--------------------------------

### Example: Zalo Bot with Webhook

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

An example of setting up a Zalo bot with webhooks using Express.js. It includes middleware for JSON parsing, a route for receiving updates, and webhook registration.

```javascript
const ZaloBot = require('node-zalo-bot');
const express = require('express');
require('dotenv').config();

const WEBHOOK_URL = "https://your-ngrok-or-domain/webhook";
const WEBHOOK_SECRET_TOKEN = "YOUR_WEBHOOK_SECRET_TOKEN";

const app = express();
const bot = new ZaloBot(process.env.BOT_TOKEN, {
  polling: false, // Disable polling when using webhook
});

// Middleware to parse JSON
app.use(express.json());

// Route to receive webhook from Zalo
app.post('/webhook', (req, res) => {
  if (req.headers['x-bot-api-secret-token'] !== WEBHOOK_SECRET_TOKEN) {
    console.log('Unauthorized request', req.headers);
    return res.status(403).json({ message: "Unauthorized" });
  }
  const update = req.body;
  bot.processUpdate(update);
  res.sendStatus(200);
});

// Handle messages
bot.on('message', (msg) => {
  bot.sendMessage(msg.chat.id, 'Xin chào!');
});

// Register webhook with Zalo
bot.setWebHook(WEBHOOK_URL, {
  secret_token: WEBHOOK_SECRET_TOKEN  
}).then(() => {
  console.log('Webhook configured successfully');
}).catch((error) => {
    console.error('Error registering webhook:', error);
  });

// Start server
const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});
```

--------------------------------

### Example: Zalo Bot with Polling

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

A complete example demonstrating how to set up and run a Zalo bot using the polling method. It includes basic message handling and text response.

```javascript
const ZaloBot = require('node-zalo-bot');
require('dotenv').config();

const bot = new ZaloBot(process.env.BOT_TOKEN, {
  polling: true
});

bot.on('message', (msg) => {
  bot.sendMessage(msg.chat.id, 'Chào bạn!');
});

bot.onText(//start (.+)/, (msg, match) => {
  bot.sendMessage(msg.chat.id, `Bạn vừa gửi: ${match[1]}`);
});
```

--------------------------------

### Get Bot Information

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

Fetches information about the Zalo bot itself.

```javascript
bot.getMe([options]);
```

--------------------------------

### Get Webhook Information

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

Retrieves information about the currently configured webhook.

```javascript
bot.getWebHookInfo([options]);
```

--------------------------------

### Start Polling for Updates

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

Initiates the polling mechanism to continuously fetch updates from the Zalo server. This is an alternative to using webhooks.

```javascript
bot.startPolling([options]);
```

--------------------------------

### Get Updates

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

Retrieves new updates from the Zalo server, typically used when polling is enabled.

```javascript
bot.getUpdates([options]);
```

--------------------------------

### Configure Environment Variables

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

Sets up the necessary environment variables for the Zalo bot, primarily the BOT_TOKEN. This is typically done by creating a .env file.

```dotenv
BOT_TOKEN=your_zalo_bot_token
```

--------------------------------

### Initialize Zalo Bot

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

Initializes a new Zalo bot instance using the BOT_TOKEN and configures it for either polling or webhook updates. Requires the 'dotenv' package to load environment variables.

```javascript
const ZaloBot = require('node-zalo-bot');
require('dotenv').config();

const bot = new ZaloBot(process.env.BOT_TOKEN, {
  polling: true, // or false if using webhook
});
```

--------------------------------

### Listen for Messages

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

Sets up an event listener to receive and process incoming messages from Zalo users. The callback function receives the message object and metadata.

```javascript
bot.on('message', (msg, metadata) => {
  console.log('Received message:', msg);
});
```

--------------------------------

### Send Chat Action (Typing)

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

Indicates that the bot is currently typing a response to the user. This provides a better user experience by showing activity.

```javascript
// Show typing indicator
bot.sendChatAction(chatId, 'typing');
```

--------------------------------

### Listen for Text Messages with Regex

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

Listens for text messages that match a specific regular expression. The matched groups are available in the callback function.

```javascript
bot.onText(//start (.+)/, (msg, match) => {
  // match[1] is the part that matches (.+)
});
```

--------------------------------

### Register Webhook

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

Registers a webhook URL with Zalo to receive updates. This requires a publicly accessible URL and optionally a secret token for security.

```javascript
bot.setWebHook(url, [options]);
```

--------------------------------

### Send Text Message

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

Sends a text message to a specified chat ID. Optional parameters can be provided for message formatting.

```javascript
bot.sendMessage(chatId, 'Hello!');
```

--------------------------------

### Delete Webhook

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

Removes the previously registered webhook from Zalo.

```javascript
bot.deleteWebHook([options]);
```

--------------------------------

### Check if Polling is Active

Source: https://www.npmjs.com/package/node-zalo-bot/index_activetab=code

Returns a boolean indicating whether the bot is currently polling for updates.

```javascript
bot.isPolling();
```

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