# Def Property

## Overloads

| [Def](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IBookmarkFieldItem.Def.htm#Qlik_Engine_IBookmarkFieldItem_Def) |  | Name and type of the field.<br><br>JSON property name: qDef |
| --- | --- | --- |

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

## Def

Name and type of the field.

JSON property name: qDef

### Declaration

```

          FieldDefEx Def { get; set; }
    
  
```

### Property Value

| Type | Description |
| --- | --- |
| [FieldDefEx](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.FieldDefEx.htm) |  |