# Custom code transform


If you need to perform more complicated transformations on your data, or want to add data property keys to the dataset, you can add a Custom code transform to your job diagram. The Custom code node allows you to enter a script that performs the transformation.

**To add a custom code node to your job diagram**

1. Open the Resource panel and then choose Custom Code to add a custom transform to your job diagram.

1. (Optional) Click on the rename node icon to enter a new name for the node in the job diagram.

1. Enter desired code changes.

The following examples show the format of the code to enter in the code box:

```
def FilterPopulationAbove1000(input_df):
  df = input_df
  df = df[df['population'] > 1000]
  return df
```

![\[The Amazon SageMaker Unified Studio UI showing the configuration options for the Custom Code transform.\]](http://docs.aws.amazon.com/sagemaker-unified-studio/latest/userguide/images/vis-etl/vis-etl-customcode.png)