Music Generation Callbacks

System will call this callback when audio generation is complete.

When you submit a music generation task to the Suno API, you can use the callBackUrl parameter to set a callback URL. The system will automatically push the results to your specified address when the task is completed.

Callback Mechanism Overview

INFO

The callback mechanism eliminates the need to poll the API for task status. The system will proactively push task completion results to your server.

Webhook Security

To ensure the authenticity and integrity of callback requests, we strongly recommend implementing webhook signature verification. See our Webhook Verification Guide for detailed implementation steps.

Callback Timing

The system will send callback notifications in the following situations:

• Music generation task completed successfully
• Music generation task failed
• Errors occurred during task processing

Callback Method

• HTTP Method: POST
• Content Type: application/json
• Timeout Setting: 15 seconds

Callback Request Format

When the task is completed, the system will send a POST request to your callBackUrl in the following format:

Success Callback

{
  "code": 200,
  "msg": "All generated successfully.",
  "data": {
    "callbackType": "complete",
    "task_id": "2fac****9f72",
    "data": [
      {
        "id": "e231****-****-****-****-****8cadc7dc",
        "audio_url": "https://example.cn/****.mp3",
        "stream_audio_url": "https://example.cn/****",
        "image_url": "https://example.cn/****.jpeg",
        "prompt": "[Verse] Night city lights shining bright",
        "model_name": "chirp-v3-5",
        "title": "Iron Man",
        "tags": "electrifying, rock",
        "createTime": "2025-01-01 00:00:00",
        "duration": 198.44
      },
      {
        "id": "e231****-****-****-****-****8cadc7dc",
        "audio_url": "https://example.cn/****.mp3",
        "stream_audio_url": "https://example.cn/****",
        "image_url": "https://example.cn/****.jpeg",
        "prompt": "[Verse] Night city lights shining bright",
        "model_name": "chirp-v3-5",
        "title": "Iron Man",
        "tags": "electrifying, rock",
        "createTime": "2025-01-01 00:00:00",
        "duration": 228.28
      }
    ]
  }
}

Failure Callback

{
  "code": 501,
  "msg": "Audio generation failed",
  "data": {
    "callbackType": "error",
    "task_id": "2fac****9f72",
    "data": null
  }
}

Status Code Description

code (integer, required)

Callback status code indicating task processing result:

Status Code	Description
200	Success - Request has been processed successfully
400	Validation Error - Lyrics contained copyrighted material
408	Rate Limited - Timeout
413	Conflict - Uploaded audio matches existing work of art
500	Server Error - An unexpected error occurred while processing the request
501	Audio generation failed
531	Server Error - Sorry, the generation failed due to an issue. Your credits have been refunded. Please try again

msg (string, required)

Status message providing detailed status description

data.callbackType (string, required)

Callback type:

• text - Text generation complete
• first - First track complete
• complete - All tracks complete
• error - Generation failed

data.task_id (string, required)

Task ID, consistent with the task_id returned when you submitted the task

data.data (array)

Generated audio data array, returned on success

data.data[].id (string)

Audio unique identifier (audioId)

data.data[].audio_url (string)

Audio file URL

data.data[].stream_audio_url (string)

Streaming audio URL

data.data[].image_url (string)

Cover image URL

data.data[].prompt (string)

Generation prompt/lyrics

data.data[].model_name (string)

Model name used

data.data[].title (string)

Music title

data.data[].tags (string)

Music tags

data.data[].createTime (string)

Creation time

data.data[].duration (number)

Audio duration (seconds)

Callback Reception Examples

Here are example codes for receiving callbacks in popular programming languages:

Node.js

const express = require('express');
const app = express();

app.use(express.json());

app.post('/suno-callback', (req, res) => {
  const { code, msg, data } = req.body;
  
  console.log('Received callback:', {
    taskId: data.task_id,
    status: code,
    message: msg,
    callbackType: data.callbackType
  });
  
  if (code === 200) {
    // Task completed successfully
    if (data.callbackType === 'complete') {
      console.log('Music generation completed:', data.data);
      
      // Process generated music data
      data.data.forEach(audio => {
        console.log(`Audio ID: ${audio.id}`);
        console.log(`Audio URL: ${audio.audio_url}`);
        console.log(`Title: ${audio.title}`);
        console.log(`Duration: ${audio.duration} seconds`);
      });
      
    } else if (data.callbackType === 'first') {
      console.log('First track completed');
      
    } else if (data.callbackType === 'text') {
      console.log('Text generation completed');
    }
    
  } else {
    // Task failed
    console.log('Task failed:', msg);
    
    // Handle failure cases...
  }
  
  // Return 200 status code to confirm callback received
  res.status(200).json({ status: 'received' });
});

app.listen(3000, () => {
  console.log('Callback server running on port 3000');
});

Python

from flask import Flask, request, jsonify
import json

app = Flask(__name__)

@app.route('/suno-callback', methods=['POST'])
def handle_callback():
    data = request.json
    
    code = data.get('code')
    msg = data.get('msg')
    callback_data = data.get('data', {})
    task_id = callback_data.get('task_id')
    callback_type = callback_data.get('callbackType')
    
    print(f"Received callback: {task_id}, status: {code}, type: {callback_type}, message: {msg}")
    
    if code == 200:
        # Task completed successfully
        if callback_type == 'complete':
            audio_list = callback_data.get('data', [])
            print(f"Music generation completed, generated {len(audio_list)} tracks")
            
            for audio in audio_list:
                print(f"Audio ID: {audio['id']}")
                print(f"Audio URL: {audio['audio_url']}")
                print(f"Title: {audio['title']}")
                print(f"Duration: {audio['duration']} seconds")
                
        elif callback_type == 'first':
            print("First track completed")
            
        elif callback_type == 'text':
            print("Text generation completed")
            
    else:
        # Task failed
        print(f"Task failed: {msg}")
        
        # Handle failure cases...
    
    # Return 200 status code to confirm callback received
    return jsonify({'status': 'received'}), 200

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=3000)

PHP

<?php
header('Content-Type: application/json');

// Get POST data
$input = file_get_contents('php://input');
$data = json_decode($input, true);

$code = $data['code'] ?? null;
$msg = $data['msg'] ?? '';
$callbackData = $data['data'] ?? [];
$taskId = $callbackData['task_id'] ?? '';
$callbackType = $callbackData['callbackType'] ?? '';

error_log("Received callback: $taskId, status: $code, type: $callbackType, message: $msg");

if ($code === 200) {
    // Task completed successfully
    if ($callbackType === 'complete') {
        $audioList = $callbackData['data'] ?? [];
        error_log("Music generation completed, generated " . count($audioList) . " tracks");
        
        foreach ($audioList as $audio) {
            error_log("Audio ID: " . $audio['id']);
            error_log("Audio URL: " . $audio['audio_url']);
            error_log("Title: " . $audio['title']);
            error_log("Duration: " . $audio['duration'] . " seconds");
        }
        
    } elseif ($callbackType === 'first') {
        error_log("First track completed");
        
    } elseif ($callbackType === 'text') {
        error_log("Text generation completed");
    }
    
} else {
    // Task failed
    error_log("Task failed: $msg");
    
    // Handle failure cases...
}

// Return 200 status code to confirm callback received
http_response_code(200);
echo json_encode(['status' => 'received']);
?>

Best Practices

Callback URL Configuration Recommendations

1. Use HTTPS: Ensure your callback URL uses HTTPS protocol for secure data transmission
2. Verify Source: Verify the legitimacy of the request source in callback processing
3. Idempotent Processing: The same task_id may receive multiple callbacks, ensure processing logic is idempotent
4. Quick Response: Callback processing should return a 200 status code as quickly as possible to avoid timeout
5. Asynchronous Processing: Complex business logic should be processed asynchronously to avoid blocking callback response
6. Stage Tracking: Differentiate between different generation stages based on callbackType and arrange business logic appropriately

Important Reminders

• Callback URL must be a publicly accessible address
• Server must respond within 15 seconds, otherwise it will be considered a timeout
• If 3 consecutive retries fail, the system will stop sending callbacks
• Please ensure the stability of callback processing logic to avoid callback failures due to exceptions
• Pay attention to handling different callbackType callbacks, especially the complete type for final results

Troubleshooting

If you do not receive callback notifications, please check the following:

Network Connection Issues

• Confirm that the callback URL is accessible from the public network
• Check firewall settings to ensure inbound requests are not blocked
• Verify that domain name resolution is correct

Server Response Issues

• Ensure the server returns HTTP 200 status code within 15 seconds
• Check server logs for error messages
• Verify that the interface path and HTTP method are correct

Content Format Issues

• Confirm that the received POST request body is in JSON format
• Check that Content-Type is application/json
• Verify that JSON parsing is correct

Callback Type Processing

• Confirm proper handling of different callbackTypes
• Check if processing of complete type final results is missed
• Verify that audio data parsing is correct

Alternative Solution

If you cannot use the callback mechanism, you can also use polling:

Poll Query Results

Use the get music details endpoint to regularly query task status. We recommend querying every 30 seconds.