Music Generation Callbacks

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

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

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:

{
  "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
      }
    ]
  }
}

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
Python
PHP

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');
});

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
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

Use HTTPS: Ensure your callback URL uses HTTPS protocol for secure data transmission
Verify Source: Verify the legitimacy of the request source in callback processing
Idempotent Processing: The same task_id may receive multiple callbacks, ensure processing logic is idempotent
Quick Response: Callback processing should return a 200 status code as quickly as possible to avoid timeout
Asynchronous Processing: Complex business logic should be processed asynchronously to avoid blocking callback response
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.

Lyrics Generation

WAV Conversion

Vocal Removal

Music Video Generation

Music Generation Callbacks

Callback Mechanism Overview

Callback Timing

Callback Method

Callback Request Format

Status Code Description

Callback Reception Examples

Best Practices

Callback URL Configuration Recommendations

Important Reminders

Troubleshooting

Alternative Solution

Poll Query Results

Lyrics Generation

WAV Conversion

Vocal Removal

Music Video Generation

​Callback Mechanism Overview

​Callback Timing

​Callback Method

​Callback Request Format

​Status Code Description

​Callback Reception Examples

​Best Practices

​Callback URL Configuration Recommendations

​Important Reminders

​Troubleshooting

​Alternative Solution

Poll Query Results

Callback Mechanism Overview

Callback Timing

Callback Method

Callback Request Format

Status Code Description

Callback Reception Examples

Best Practices

Callback URL Configuration Recommendations

Important Reminders

Troubleshooting

Alternative Solution