# Code128Subset

Parameter `Code128Subset` defines the subset of Code 128.

## JSON Structure

**Location in template:**
```
BarcodeFormatSpecificationOptions[i]
    └── Code128Subset
```

**Parent object:** [BarcodeFormatSpecification](https://www.dynamsoft.com/capture-vision/docs/core/parameters/reference/barcode-format-specification/index.md) object

**Example:**

```json
{
    "Code128Subset": "A"
}
```

> [!NOTE]
> - This snippet shows only the `Code128Subset` parameter.
> - To use it, embed this parameter within a [BarcodeFormatSpecification](https://www.dynamsoft.com/capture-vision/docs/core/parameters/reference/barcode-format-specification/index.md) object.
> - For the complete JSON structure, see:
>   - [Full JSON Structure](https://www.dynamsoft.com/capture-vision/docs/core/parameters/reference/index.md#full-json-structure)
>   - [Minimal Valid JSON](https://www.dynamsoft.com/capture-vision/docs/core/parameters/reference/index.md#minimal-valid-json-example)

## Parameter Details

The structure of the `Code128Subset` is shown as follow:

| Code128Subset  Parameter Details |
| :--------------------------------- |
| **Type**<br>*string* |
| **Range**<br>"A"<br>"B"<br>"C" |
| **Default Value**<br> ""|