API Reference

Suno Lyric Writing

Suno Lyric Writing: suno/lyrics.

POST https://api.tu-zi.com/suno/v2/lyrics

Preview guide

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# Suno Lyric Writing

Suno Lyric Writing: suno/lyrics.

## Endpoint and authentication

`POST https://api.tu-zi.com/suno/v2/lyrics`

Transport: json

Use an inference API key. Examples contain placeholders; read credentials from environment variables.

```http
Authorization: Bearer YOUR_API_KEY
Content-Type: application/json
```

## Body parameters

| Field | Type | Required | Description / constraints |
| --- | --- | --- | --- |
| prompt | string | Yes | Full lyrics, up to 5000 characters. Use markers like [Verse] and [Chorus] to shape the structure. Example: [Verse 1]<br>雨打在铁皮屋顶上 |
| lyrics_model | string | No | Which lyric writing approach to use. Form initial value (not an upstream default): "classic" Values: "classic", "remi" |

## Minimal request example

```json
{
  "prompt": "[Verse 1]\n雨打在铁皮屋顶上"
}
```

## Before running

Replace https://api.tu-zi.com with this site origin (do not append /v1 twice), and YOUR_MODEL with the exact marketplace model ID. Install requests for Python; use Node.js 20+ and save JavaScript as .mjs. WebSocket samples list their own dependencies.

Create an inference key on the site and set API_KEY in the environment; replace YOUR_API_KEY in cURL. Prepare local input.png/input.wav files for upload examples.

Start with a minimal request, then read the result using the response fields below. For async APIs, a returned task ID requires polling; acceptance does not mean generation has finished.

## Code examples

### curl

```bash
curl --request POST 'https://api.tu-zi.com/suno/v2/lyrics' \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
  "prompt": "[Verse 1]\n雨打在铁皮屋顶上"
}'
```

### python

```python
import json
import os
import requests

url = "https://api.tu-zi.com/suno/v2/lyrics"
headers = json.loads("{\"Authorization\":\"Bearer YOUR_API_KEY\",\"Content-Type\":\"application/json\"}")
headers["Authorization"] = "Bearer " + os.environ["API_KEY"]
payload = json.loads("{\"prompt\":\"[Verse 1]\\n雨打在铁皮屋顶上\"}")
response = requests.request("POST", url, headers=headers, json=payload, timeout=120)
response.raise_for_status()
result = response.json()
if isinstance(result, dict) and (result.get("success") is False or result.get("error")):
    raise RuntimeError(json.dumps(result, ensure_ascii=False))
print(result)  # Also inspect protocol-specific status/code fields.
```

### javascript

```javascript
// Node.js 20+
const url = "https://api.tu-zi.com/suno/v2/lyrics";
const headers = {
  "Authorization": "Bearer YOUR_API_KEY",
  "Content-Type": "application/json"
};
headers.Authorization = 'Bearer ' + process.env.API_KEY;
const response = await fetch(url, { method: "POST", headers, body: JSON.stringify({
  "prompt": "[Verse 1]\n雨打在铁皮屋顶上"
}) });
if (!response.ok) throw new Error(await response.text());
const result = await response.json();
if (result?.success === false || result?.error) throw new Error(JSON.stringify(result));
console.log(result); // Also inspect protocol-specific status/code fields.
```

## Response fields

| Field | Type | Description / constraints |
| --- | --- | --- |
| code | string | Submission result code. |
| data.task_id | string | Public gateway task ID. |

Illustrative response; some endpoints show essential fields only. Optional fields may be absent.

```json
{
  "code": "success",
  "data": {
    "task_id": "task_example"
  }
}
```

## Asynchronous workflow

Save the public task ID and GET /suno/v2/fetch/{task_id} with the same key. Handle gateway states; SUCCESS and FAILURE are terminal. Read music, lyrics, download links or resource IDs according to the action.

## Errors and retries

Check HTTP status and protocol-specific errors; do not mix error formats across protocols. For 401/403 check credentials and permissions, for 429 back off, and for 5xx check gateway/upstream status. Error bodies may contain error/message/code depending on the protocol.

Use bounded exponential backoff for reads. Do not blindly retry task creation, generation, or key mutations, to avoid duplicate billing or execution.

## Constraints

Model suno/lyrics is selected by the action route, so the body does not need model. Resource IDs must belong to this account and be created through the gateway; do not use upstream internal IDs.

## Documentation source

Definition version: 1

Reviewed: 2026-11-02

Source: https://api.tu-zi.com/en/docs/api/reference-relay-suno-v2-lyrics

Related protocol guide: https://api.tu-zi.com/docs/api/suno

This export contains documentation and examples only, without real credentials, account data or user requests.

Updated 2026-11-02 · Reviewed 2026-11-02

Endpoint and authentication

POST https://api.tu-zi.com/suno/v2/lyrics

Transport: json

Use an inference API key. Examples contain placeholders; read credentials from environment variables.

Authorization: Bearer YOUR_API_KEY
Content-Type: application/json

Minimal request example

{
  "prompt": "[Verse 1]\n雨打在铁皮屋顶上"
}

Before running

Replace https://api.tu-zi.com with this site origin (do not append /v1 twice), and YOUR_MODEL with the exact marketplace model ID. Install requests for Python; use Node.js 20+ and save JavaScript as .mjs. WebSocket samples list their own dependencies.

Create an inference key on the site and set API_KEY in the environment; replace YOUR_API_KEY in cURL. Prepare local input.png/input.wav files for upload examples.

Start with a minimal request, then read the result using the response fields below. For async APIs, a returned task ID requires polling; acceptance does not mean generation has finished.

Constraints

Model suno/lyrics is selected by the action route, so the body does not need model. Resource IDs must belong to this account and be created through the gateway; do not use upstream internal IDs.

Body parameters

Field	Type	Required	Description / constraints
prompt	string	Yes	Full lyrics, up to 5000 characters. Use markers like [Verse] and [Chorus] to shape the structure. Example: [Verse 1]<br>雨打在铁皮屋顶上
lyrics_model	string	No	Which lyric writing approach to use. Form initial value (not an upstream default): "classic" Values: "classic", "remi"

Response fields

Field	Type	Description / constraints
code	string	Submission result code.
data.task_id	string	Public gateway task ID.

Illustrative response; some endpoints show essential fields only. Optional fields may be absent.

{
  "code": "success",
  "data": {
    "task_id": "task_example"
  }
}

Asynchronous workflow

Save the public task ID and GET /suno/v2/fetch/{task_id} with the same key. Handle gateway states; SUCCESS and FAILURE are terminal. Read music, lyrics, download links or resource IDs according to the action.

Errors and retries

Check HTTP status and protocol-specific errors; do not mix error formats across protocols. For 401/403 check credentials and permissions, for 429 back off, and for 5xx check gateway/upstream status. Error bodies may contain error/message/code depending on the protocol.

Use bounded exponential backoff for reads. Do not blindly retry task creation, generation, or key mutations, to avoid duplicate billing or execution.

Document information and sources

Documentation source

Definition version: 1

Reviewed: 2026-11-02

Source: https://api.tu-zi.com/en/docs/api/reference-relay-suno-v2-lyrics

Related protocol guide: https://api.tu-zi.com/docs/api/suno

This export contains documentation and examples only, without real credentials, account data or user requests.

Request examples

curl --request POST 'https://api.tu-zi.com/suno/v2/lyrics' \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
  "prompt": "[Verse 1]\n雨打在铁皮屋顶上"
}'

import json
import os
import requests

url = "https://api.tu-zi.com/suno/v2/lyrics"
headers = json.loads("{\"Authorization\":\"Bearer YOUR_API_KEY\",\"Content-Type\":\"application/json\"}")
headers["Authorization"] = "Bearer " + os.environ["API_KEY"]
payload = json.loads("{\"prompt\":\"[Verse 1]\\n雨打在铁皮屋顶上\"}")
response = requests.request("POST", url, headers=headers, json=payload, timeout=120)
response.raise_for_status()
result = response.json()
if isinstance(result, dict) and (result.get("success") is False or result.get("error")):
    raise RuntimeError(json.dumps(result, ensure_ascii=False))
print(result)  # Also inspect protocol-specific status/code fields.

// Node.js 20+
const url = "https://api.tu-zi.com/suno/v2/lyrics";
const headers = {
  "Authorization": "Bearer YOUR_API_KEY",
  "Content-Type": "application/json"
};
headers.Authorization = 'Bearer ' + process.env.API_KEY;
const response = await fetch(url, { method: "POST", headers, body: JSON.stringify({
  "prompt": "[Verse 1]\n雨打在铁皮屋顶上"
}) });
if (!response.ok) throw new Error(await response.text());
const result = await response.json();
if (result?.success === false || result?.error) throw new Error(JSON.stringify(result));
console.log(result); // Also inspect protocol-specific status/code fields.