Add Data Transformer documentation for Studio Pro 11.11

content/en/docs/refguide/modeling/integration/data-transformers/_index.md

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+---
+title: "Data Transformers"
+url: /refguide/data-transformers/
+weight: 50
+description: "Describes Data Transformer documents in Mendix Studio Pro."
+beta: true
+---
+
+## Introduction
+
+Data Transformer documents can be used to transform data of a certain structure into another data of another structure. In practice, basically a message-to-message transformation within Mendix Studio Pro. 
+
+Using this feature, you can pre-process an incoming message (for example, from an API response or MQTT message) before an import mapping. Additionally, you can also use it to transform a message before passing it on to a downstream system that expects the data in a certain structure.
+
+{{% alert color="info" %}}
+This feature is in beta. 
+{{% /alert %}}
+
+### Prerequisites
+
+* [Studio Pro 11.11](https://marketplace.mendix.com/link/studiopro/11.11.0) or higher
+
+### Limitations
+
+Data transformers currently have the following limitations:
+
+* We only support JSON-to-JSON transformation with JSLT, a JSON transformation language
+
+### Usage Example
+
+Consider an API that returns customer data with many fields, but you only need a few specific fields for your Mendix app:
+
+**Input JSON from API:**
+
+```json
+{
+  "customer_id": "12345",
+  "first_name": "John",
+  "last_name": "Smith",
+  "email": "john.smith@example.com",
+  "phone": "+1-555-0123",
+  "address": "123 Main St",
+  "city": "New York",
+  "country": "USA",
+  "account_status": "active",
+  "credit_limit": 5000,
+  "internal_notes": "VIP customer",
+  "created_date": "2024-01-15"
+}
+```
+
+**JSLT Transformation:**
+
+```jslt
+{
+  "id": .customer_id,
+  "fullName": .first_name + " " + .last_name,
+  "email": .email,
+  "location": .city + ", " + .country
+}
+```
+
+**Output JSON:**
+
+```json
+{
+  "id": "12345",
+  "fullName": "John Smith",
+  "email": "john.smith@example.com",
+  "location": "New York, USA"
+}
+```
+
+In this example, the data transformer extracts only the required fields, combines the first and last name into a single field, and creates a location string from the city and country. This simplified output can then be easily mapped to your Mendix entities.
+
+## Add the Data Transformer Document
+
+You can add the data transformer document to your app, by following these steps:
+
+1. Right-click the module you want to add the data transformer document to.
+1. Select **Add other** > **Data Transformer**.
+1. Name the data transformer:
+
+    {{< figure src="/attachments/refguide/modeling/integration/data-transformers/add-data-transformer.png" alt="Add Data Transformer dialog" >}}
+
+1. In the **Input JSON** editor, paste a JSON snippet that you would like to transform.
+1. Define the transformation in **JSLT transformation** editor.
+1. Click the **Test Transformation** button below the JSLT transformation editor to preview the transformation result in the **Output JSON**:
+
+    {{< figure src="/attachments/refguide/modeling/integration/data-transformers/define-transformation.png" alt="Data Transformer interface showing Input JSON, JSLT transformation, and Output JSON editors" >}}
+
+## Use the Data Transformer in a Microflow
+
+To perform a transformation in a microflow, complete the following steps:
+
+1. Drag the **Transform JSON** activity into a microflow, preferably after a REST call or anything that provides input for the transformation:
+
+    {{< figure src="/attachments/refguide/modeling/integration/data-transformers/transform-json-dialog.png" alt="Add Transform JSON activity" >}}
+
+1. Double-click the activity and click **Select** to choose an existing data transformer document or create a new one.
+1. Click on the dropdown **Variable (String)**, and select the input string variable from the list.
+1. Specify the name of the output in the **Variable name** text field.
+1. Click **OK**:
+
+    {{< figure src="/attachments/refguide/modeling/integration/data-transformers/configure-transformer-activity.png" alt="Configure Transform JSON activity dialog" >}}
+
+## Data Transformer Output Uses
+
+You can use your transformed JSON snippet in the following ways:
+
+* Create a new JSON structure for import mapping
+* Pass the transformed JSON to downstream systems
+* Use it as input for further processing in your microflow
+
+## Use Cases
+
+Use the Data Transformer document to do the following:
+
+* [Filter out unused fields](/refguide/data-transformer-how-tos/#filtering-out-unused-fields)
+* [Simplify nested structures](/refguide/data-transformer-how-tos/#simplifying-nested-structures)
+* [Normalize objects to arrays (working with dynamic keys)](/refguide/data-transformer-how-tos/#normalising-objects-to-arrays-working-with-dynamic-keys)
+* [Zip metadata with data](/refguide/data-transformer-how-tos/#zipping-metadata-with-data)
+* [Flatten bill of materials (BOM)](/refguide/data-transformer-how-tos/#flattening-bill-of-materials-bom)
+* [Extract information from a string](/refguide/data-transformer-how-tos/#extracting-information-from-a-string)
+* [Work with SPARQL query results](/refguide/data-transformer-how-tos/#working-with-sparql-query-results)
+
+## Read More
+
+* Mendix resources:
+  * For detailed examples of Data Transformers in action, see [Data Transformer Use Cases](/refguide/data-transformer-use-cases/).
+* GitHub resources on JSLT:
+  * A short [introduction](https://github.com/schibsted/jslt/blob/master/README.md#jslt) and [tutorial](https://github.com/schibsted/jslt/blob/master/tutorial.md#jslt-tutorial) on how to use JSLT
+  * A complete list of [functions available in JSLT](https://github.com/schibsted/jslt/blob/master/functions.md#jslt-functions)