> ## Documentation Index
> Fetch the complete documentation index at: https://docs.omocaptcha.com/llms.txt
> Use this file to discover all available pages before exploring further.
# GeetestSelectObjectTask
> Solve Geetest Select Object captcha - pick images matching the anchor
Select object captcha is a common image verification. The user selects grid cells whose subject matches the requested anchor.
## 1. Create task
**Request**
```text theme={null}
POST https://api.omocaptcha.com/v2/createTask
```
| Parameter | Type | Required | Description |
| ------------------ | -------- | :------: | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `clientKey` | `String` | ✅ | Client account key |
| `task.type` | `String` | ✅ | `GeetestSelectObjectTask` |
| `task.imageBase64` | `String` | ✅ | Base64-encoded 3×3 grid image
|
| `task.question` | `String` | ✅ | Captcha question (e.g. `Select 3 images with`) |
| `task.anchor` | `String` | ✅ | Base64-encoded anchor image (shown right after the question)
|
```bash cURL theme={null}
curl -X POST https://api.omocaptcha.com/v2/createTask \
-H "Content-Type: application/json" \
-d '{
"clientKey": "OMO_API_KEY",
"task": {
"type": "GeetestSelectObjectTask",
"imageBase64": "BASE64_BODY_HERE",
"question": "Select 3 images with",
"anchor": "BASE64_ICON_HERE"
}
}'
```
```javascript Node.js theme={null}
const axios = require('axios');
const { data } = await axios.post('https://api.omocaptcha.com/v2/createTask', {
clientKey: 'OMO_API_KEY',
task: {
type: 'GeetestSelectObjectTask',
imageBase64: 'BASE64_BODY_HERE',
question: 'Select 3 images with',
anchor: 'BASE64_ICON_HERE'
}
});
console.log(data);
```
```python Python theme={null}
import requests
res = requests.post('https://api.omocaptcha.com/v2/createTask', json={
'clientKey': 'OMO_API_KEY',
'task': {
'type': 'GeetestSelectObjectTask',
'imageBase64': 'BASE64_BODY_HERE',
'question': 'Select 3 images with',
'anchor': 'BASE64_ICON_HERE'
}
})
print(res.json())
```
```php PHP theme={null}
'OMO_API_KEY',
'task' => [
'type' => 'GeetestSelectObjectTask',
'imageBase64' => 'BASE64_BODY_HERE',
'question' => 'Select 3 images with',
'anchor' => 'BASE64_ICON_HERE'
]
]));
echo curl_exec($ch);
```
**Response**
Success:
```json theme={null}
{
"errorId": 0,
"taskId": "49f9f60a-c809-4af0-93c0-0409b72e67e0"
}
```
The server returns `errorId = 0` with a `taskId` on success.
Failure:
```json theme={null}
{
"errorId": 1,
"errorCode": "",
"errorDescription": ""
}
```
The server returns `errorId = 1` and an `errorCode`.
## 2. Get task result
**Request**
```text theme={null}
POST https://api.omocaptcha.com/v2/getTaskResult
```
```json theme={null}
{
"clientKey": "OMO_API_KEY",
"taskId": "49f9f60a-c809-4af0-93c0-0409b72e67e0"
}
```
**Response**
Success:
```json theme={null}
{
"errorId": 0,
"errorCode": "",
"errorDescription": "",
"status": "ready",
"solution": {
"objects": [0, 1, 6]
}
}
```
The server returns `errorId = 0` and `status = ready`. Read the answer from `solution.objects`.
`objects` is the list of matching cell indices (0–8), counted left-to-right, top-to-bottom:
* Row 1: `0`, `1`, `2`
* Row 2: `3`, `4`, `5`
* Row 3: `6`, `7`, `8`
Processing:
```json theme={null}
{
"status": "processing",
"errorId": 0,
"errorCode": "",
"errorDescription": ""
}
```
The server returns `errorId = 0` and `status = processing`. Wait 2 seconds and retry.
Failure:
```json theme={null}
{
"errorId": 1,
"errorCode": "ERROR_JOB_STATUS",
"errorDescription": "Job failed",
"status": "fail",
"solution": {}
}
```
The server returns `errorId = 1`.