Audio Upload and Cover Callbacks

When you submit an audio upload and cover 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:

Text generation completed (callbackType: “text”)
First audio track generation completed (callbackType: “first”)
All audio tracks generation completed (callbackType: “complete”)
Audio 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 progresses or completes, 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",
        "source_audio_url": "https://example.cn/****.mp3",
        "stream_audio_url": "https://example.cn/****",
        "source_stream_audio_url": "https://example.cn/****",
        "image_url": "https://example.cn/****.jpeg",
        "source_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",
        "source_audio_url": "https://example.cn/****.mp3",
        "stream_audio_url": "https://example.cn/****",
        "source_stream_audio_url": "https://example.cn/****",
        "image_url": "https://example.cn/****.jpeg",
        "source_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 indicating the stage of generation:

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 taskId returned when you submitted the task

data.data

array

required

Array of generated audio tracks. Empty for text callbacks or failures.

data.data[].id

string

Audio unique identifier (audioId)

data.data[].audio_url

string

Generated audio file URL for download

data.data[].source_audio_url

string

Original source audio file URL

data.data[].stream_audio_url

string

Generated streaming audio URL for real-time playback

data.data[].source_stream_audio_url

string

Original source streaming audio URL

data.data[].image_url

string

Generated cover image URL

data.data[].source_image_url

string

Original source cover image URL

data.data[].prompt

string

Generation prompt/lyrics used

data.data[].model_name

string

Model name used for generation (e.g., “chirp-v3-5”)

data.data[].title

string

Music title

data.data[].tags

string

Music tags/genre

data.data[].createTime

string

Creation timestamp

data.data[].duration

number

Audio duration in seconds

Callback Reception Examples

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

Node.js
Python
PHP

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

app.use(express.json());

app.post('/suno-cover-callback', (req, res) => {
  const { code, msg, data } = req.body;
  
  console.log('Received Suno audio cover callback:', {
    taskId: data.task_id,
    callbackType: data.callbackType,
    status: code,
    message: msg
  });
  
  if (code === 200) {
    // Task progressed or completed successfully
    const { callbackType, task_id, data: tracks } = data;
    
    console.log(`Callback type: ${callbackType}`);
    console.log(`Number of tracks: ${tracks.length}`);
    
    switch (callbackType) {
      case 'text':
        console.log('Text generation completed, waiting for audio...');
        break;
        
      case 'first':
        console.log('First track completed, processing remaining tracks...');
        downloadTracks(tracks, task_id);
        break;
        
      case 'complete':
        console.log('All tracks completed successfully!');
        downloadTracks(tracks, task_id);
        break;
    }
    
  } else {
    // Task failed
    console.log('Suno audio cover failed:', msg);
    
    // Handle specific error types
    if (code === 400) {
      console.log('Validation error - check for copyrighted content');
    } else if (code === 408) {
      console.log('Rate limited - please wait before retrying');
    } else if (code === 413) {
      console.log('Content conflict - uploaded audio matches existing work');
    } else if (code === 501) {
      console.log('Generation failed - may need to adjust parameters');
    } else if (code === 531) {
      console.log('Server error with credit refund - safe to retry');
    }
  }
  
  // Return 200 status code to confirm callback received
  res.status(200).json({ status: 'received' });
});

// Function to download tracks
function downloadTracks(tracks, taskId) {
  tracks.forEach((track, index) => {
    const { 
      id, 
      audio_url, 
      source_audio_url,
      image_url, 
      source_image_url,
      title, 
      duration 
    } = track;
    
    console.log(`Track ${index + 1}: ${title} (${duration}s)`);
    
    // Download generated audio file
    if (audio_url) {
      downloadFile(audio_url, `suno_cover_${taskId}_${id}.mp3`)
        .then(() => console.log(`Generated audio downloaded: ${id}`))
        .catch(err => console.error(`Generated audio download failed for ${id}:`, err));
    }
    
    // Download source audio file
    if (source_audio_url) {
      downloadFile(source_audio_url, `suno_source_${taskId}_${id}.mp3`)
        .then(() => console.log(`Source audio downloaded: ${id}`))
        .catch(err => console.error(`Source audio download failed for ${id}:`, err));
    }
    
    // Download generated cover image
    if (image_url) {
      downloadFile(image_url, `suno_cover_img_${taskId}_${id}.jpeg`)
        .then(() => console.log(`Generated cover downloaded: ${id}`))
        .catch(err => console.error(`Generated cover download failed for ${id}:`, err));
    }
    
    // Download source cover image
    if (source_image_url) {
      downloadFile(source_image_url, `suno_source_img_${taskId}_${id}.jpeg`)
        .then(() => console.log(`Source cover downloaded: ${id}`))
        .catch(err => console.error(`Source cover download failed for ${id}:`, err));
    }
  });
}

// Helper function to download files
function downloadFile(url, filename) {
  return new Promise((resolve, reject) => {
    const file = fs.createWriteStream(filename);
    
    https.get(url, (response) => {
      if (response.statusCode === 200) {
        response.pipe(file);
        file.on('finish', () => {
          file.close();
          resolve();
        });
      } else {
        reject(new Error(`HTTP ${response.statusCode}`));
      }
    }).on('error', reject);
  });
}

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

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
Handle Multiple Callbacks: Be prepared to receive text, first, and complete callbacks for the same task
Download Both Versions: Consider downloading both generated and source files for comparison

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
You may receive multiple callbacks for the same task (text → first → complete)
Please ensure the stability of callback processing logic to avoid callback failures due to exceptions
Handle copyright and conflict errors appropriately (codes 400, 413)
Credit refunds are automatic for certain server errors (code 531)
Be aware of both generated and source file URLs for complete asset management

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

Audio Processing Issues

Confirm that audio URLs are accessible
Check audio download permissions and network connections
Verify audio save paths and permissions
Handle both regular and streaming audio URLs appropriately
Process multiple tracks in the same callback
Download both generated and source audio files as needed

Review error messages for copyright violations (code 400)
Check for content conflicts with existing works (code 413)
Ensure compliance with platform content policies
Adjust uploaded audio or prompts if flagged
Verify uploaded audio originality

Rate Limiting Issues

Handle timeout errors gracefully (code 408)
Implement appropriate retry logic with backoff
Monitor API usage to avoid rate limits
Consider upgrading service plan if needed

File Management Issues

Organize downloaded files by type (generated vs source)
Implement proper file naming conventions
Handle potential duplicate downloads gracefully
Monitor disk space for large audio files

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

Audio Upload and Cover 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