# GetExpressionBNF Method

## Overloads

| [GetExpressionBNF()](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.App.GetExpressionBNF.htm#Qlik_Engine_App_GetExpressionBNF) |  | Gets the current Backus-Naur Form (BNF) grammar of the Qlik chart expressions supported within a given App. |
| --- | --- | --- |

[](https://help.qlik.com/en-US/sense-developer/Subsystems/NetSDKAPIref/Content/Qlik.Engine.App.GetExpressionBNF.htm) [](https://help.qlik.com/en-US/sense-developer/Subsystems/NetSDKAPIref/Content/Qlik.Engine.App.GetExpressionBNF.htm)

## GetExpressionBNF()

Gets the current Backus-Naur Form (BNF) grammar of the Qlik chart expressions supported within a given App.

### Declaration

```

          public GetExpressionBNFResult GetExpressionBNF()
    
  
```

### Returns

| Type | Description |
| --- | --- |
| [GetExpressionBNFResult](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.GetExpressionBNFResult.htm) |  |

### Implements

[IApp.GetExpressionBNF()](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IApp.GetExpressionBNF.htm#Qlik_Engine_IApp_GetExpressionBNF)