@coze/api

Coze API SDK

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Official Node.js and Browser SDK for Coze（or 扣子） API platform.

Quick Start

1. Installation

npm install @coze/api
# or
pnpm install @coze/api

2. Basic Usage

import { CozeAPI, COZE_COM_BASE_URL, ChatStatus, RoleType } from '@coze/api';

// Initialize client with your Personal Access Token
const client = new CozeAPI({
  token: 'your_pat_token', // Get your PAT from https://www.coze.com/open/oauth/pats
  // or
  // token: async () => {
  //   // refresh token if expired
  //   return 'your_oauth_token';
  // },
  baseURL: COZE_COM_BASE_URL,
});

// Simple chat example
async function quickChat() {
  const v = await client.chat.createAndPoll({
    bot_id: 'your_bot_id',
    additional_messages: [{
      role: RoleType.User,
      content: 'Hello!',
      content_type: 'text',
    }],
  });

    if (v.chat.status === ChatStatus.COMPLETED) {
    for (const item of v.messages) {
      console.log('[%s]:[%s]:%s', item.role, item.type, item.content);
    }
    console.log('usage', v.chat.usage);
  }
}

Key Features

• 🌐 Full API Support: Covers all Coze Open Platform APIs
• 🔐 Multiple Auth Methods: PAT, OAuth, JWT, OAuth PKCE
• 🔄 Streaming Support: Real-time responses for chat and workflow
• 🔄 Websocket Support: Real-time responses for chat, speech, and transcriptions
• 🌍 Cross-Platform: Works in Node.js (≥14) and modern browsers
• ⚙️ Configurable: Timeout, headers, signal, debug options

Authentication Options

1. Personal Access Token (Simplest)

const client = new CozeAPI({
  token: 'your_pat_token',
  baseURL: COZE_COM_BASE_URL, // Use COZE_CN_BASE_URL for China region
});

2. Other Auth Methods

• OAuth Web Application
• OAuth PKCE
• JWT
• Device Code Flow

View authentication examples →

Advanced Usage

Streaming Chat

import { CozeAPI, ChatEventType, RoleType } from '@coze/api';

async function streamChat() {
  const stream = await client.chat.stream({
    bot_id: 'your_bot_id',
    additional_messages: [{
      role: RoleType.User,
      content: 'Hello!',
      content_type: 'text',
    }],
  });

  for await (const part of stream) {
    if (part.event === ChatEventType.CONVERSATION_MESSAGE_DELTA) {
      process.stdout.write(part.data.content); // Real-time response
    }
  }
}

Websocket Chat

import { CozeAPI, RoleType, WebsocketsEventType } from '@coze/api';

async function wsChat() {
  const ws = await client.websockets.chat.create('your_bot_id');

  ws.onopen = () => {
    ws.send({
      id: 'event_id',
      event_type: WebsocketsEventType.CHAT_UPDATE,
      data: {
        chat_config: {
          auto_save_history: true,
          user_id: 'uuid',
          meta_data: {},
          custom_variables: {},
          extra_params: {},
        },
      },
    });

    ws.send({
      id: 'event_id',
      event_type: WebsocketsEventType.CONVERSATION_MESSAGE_CREATE,
      data: {
        role: RoleType.User,
        content: 'tell me a joke',
        content_type: 'text',
      },
    });
  };

  ws.onmessage = (data, event) => {
    if (data.event_type === WebsocketsEventType.ERROR) {
      if (data.data.code === 4100) {
        console.error('Unauthorized Error', data);
      } else if (data.data.code === 4101) {
        console.error('Forbidden Error', data);
      } else {
        console.error('WebSocket error', data);
      }
      ws.close();
      return;
    }

    if (data.event_type === WebsocketsEventType.CONVERSATION_MESSAGE_DELTA) {
      console.log('on message delta', data.data);
    } else if (
      data.event_type === WebsocketsEventType.CONVERSATION_CHAT_COMPLETED
    ) {
      console.log('on chat completed', data.data);
    }
  };

  ws.onerror = error => {
    console.error('WebSocket error', error);
    ws.close();
  };
}

Proxy Example

const client = new CozeAPI({
  token: '', // use proxy token in server
  baseURL: 'http://localhost:8080/api',
});

View proxy example →

Websocket Speech

import { WsSpeechClient, WebsocketsEventType } from '@coze/api/ws-tools';

// Initialize
const client = new WsSpeechClient({
  token: 'your_pat_token',
  baseWsURL: COZE_CN_BASE_WS_URL,
  allowPersonalAccessTokenInBrowser: true, // optional
});

// Listen for all downstream events (including error)
client.on('data', data => {
  console.log('[speech] ws data', data);
});

// Or, listen for a single event
client.on(WebsocketsEventType.ERROR, data => {
  console.error('[speech] ws error', data);
});

// Listen for playback completed event
client.on('completed', () => {
  console.log('[speech] playback completed');
});

// Connect
try {
  await client.connect({voiceId: 'your_voice_id'});
  console.log('[speech] ws connect success');
} catch (error) {
  console.error('[speech] ws connect error', error);
  return;
}

// Send message and play
client.appendAndComplete(message);

// Interrupt
client.interrupt();

// Disconnect, destroy instance
client.disconnect();

// Pause speech playback
client.pause();

// Resume speech playback
client.resume();

// Toggle speech playback
client.togglePlay();

// Check if speech is playing
client.isPlaying();

// Send text fragment
client.append(message);
// End sending text
client.complete();

More Examples

Feature	Description	Example
Chat	Text conversations	chat.ts
Bot Management	Create and manage bots	bot.ts
Datasets	Document management	datasets.ts
Workflow	Run workflow	workflow.ts
Voice	Speech synthesis	voice.ts
Templates	Template management	templates.ts
Chat（websocket）	Text and voice chat	chat.ts
Speech（websocket）	Text to speech	speech.ts
Transcriptions（websocket）	Speech to text	transcriptions.ts
View all examples →
Websocket Events →

Development

# Install dependencies
rush update  # If `rush` command is not installed, see ../../README.md

# Run tests
npm run test

Try Examples

Node.js

cd examples/coze-js-node
npm run run-preinstall
npm install
npx tsx ./src/chat.ts

# For China region (api.coze.cn)
COZE_ENV=zh npx tsx ./src/chat.ts            # macOS/Linux
set "COZE_ENV=zh" && npx tsx ./src/chat.ts   # Windows CMD
$env:COZE_ENV="zh"; npx tsx ./src/chat.ts    # Windows PowerShell

Browser

cd examples/coze-js-web
rush build
npm start

Documentation

For detailed API documentation and guides, visit:

• API Overview
• Authentication Guide