> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/cortex-xsoar-8-on-prem/8.12/configure-cortex-xsoar/lists/use-cases-json-lists.md).
# Use cases: JSON lists
List data can be stored in various structures, including JSON format. When accessing a valid JSON file from within a playbook, it is automatically parsed as a JSON object (list). Depending on how you store the data, you may need to [Transform a List into an Array](/cortex-xsoar-8-on-prem/8.12/configure-cortex-xsoar/lists/transform-a-list-into-an-array.md). For example, if using non-built-in commands in a script or you want to loop over list items, you should transform a list into an array. Working with a JSON file list in a playbook typically involves the following actions:
* Extract the data from a JSON object
* Extract a subset of the data
* Filter extracted data
* Apply transformers to extracted data. See [Filter and transform data](/cortex-xsoar-8-on-prem/8.12/configure-cortex-xsoar/playbooks/customize-your-playbook/filter-and-transform-data.md) for more details.
Extract data from a JSON object
Create a JSON list and use the **Set** automation to create a new context key that can extract the data from the list.
1. Create a List:
1. In the Name field, type `Test1`.
2. Select **Settings & Info** **Settings** **Advanced** **Lists** **Add a List**.
3. In the **Content Type** field, select **JSON** and add the following content:
```programlisting
{
"domain": {
"name": "mwidomain",
"prod_mode": "prod",
"user": "weblogic",
"admin": {
"servername": "AdminServer",
"listenport": "8001"
},
"machines": [
{
"refname": "Machine1",
"name": "MWINODE01"
},
{
"refname": "Machine2",
"name": "MWINODE02"
}
],
"clusters": [
{
"refname": "Cluster1",
"name": "App1Cluster",
"machine": "Box1"
},
{
"refname": "Cluster1",
"name": "App2Cluster",
"machine": "Box2"
}
],
"servers": [
{
"name": "ms1",
"port": 9001,
"machine": "Box1",
"clusterrefname": "Cluster1"
},
{
"name": "ms2",
"port": 9002,
"machine": "Box2",
"clusterrefname": "Cluster2"
}
]
}
}
```
4. **Save** the list.
2. Create a playbook task with the **Set** automation:
1. Select **Playbooks** → **New Playbook**.
2. Name the playbook, and click Save.
3. Click Create Task and provide a task name.
4. In the **Choose Script** field, select **Set** .
The **Set** script sets a value in context under the key entered.
5. In the **key** field, define a context key name for the data. For example, JSONData.
6. In the **value** field, set the list you want to extract by clicking the curly brackets.
7. Click **Filters And Transformers**.
8. In the **Get** field, click the curly brackets, and in the **Select source for value** section, select the list you created in step 1: **Test1**.
9. In the **Fetch data** field, select an incident to test the data.
10. Click **Test**.
In this example, the test results have found the list data.
11. When the test completes, click **Save**.
12. Save the task and playbook.
3. Check all the data is stored in the context key you defined by testing the playbook using the debugger:
1. Click **Run**.
2. Open the **Debugger Panel**.
The key you defined, JSONData, holds the data in context from the JSON object.
Extract a subset of the data
In general, you can extract subsets of context data in a playbook to analyze a specific information set. This also applies to working with lists, for example extracting a subset of the data from a JSON object. In this example, we want to extract server information from the list created above.
1. In a playbook, create a task.
1. In the **Choose Script** field, select **Set** .
2. In the **key** field, define a context key name for the data; for example, JSONDataSubset.
3. In the **value** field, set the list you want to extract by clicking the curly brackets.
4. Click **Filters And Transformers**.
5. In the **Get** field, enter **`lists.Test1.domain.servers`**.
6. In the **Fetch data** field, select an incident to test the data.
7. Click **Test**.
8. When the test completes, click **Save**.
9. Save the task and the playbook.
2. Check that all the data is stored in the context key you defined by testing the playbook using the debugger.
1. Click **`Run`** Debugger Panel.
2. The key you defined (JSONDataSubset) holds the subset of the data in context from the JSON object.
Filter extracted data
You can filter the data subset you extracted and analyze this information on a more granular level. In this example, you want to filter Box1 information from the list created in Extract the data from a JSON Object above.
1. Re-open the task you created above.
2. Click the **value** field.
3. Under **Filter**, click **Add Filter**.
4. Set the condition you want to filter.
In this example, retrieve the list of machines named **`Box1`** from **`Test1`** list by setting the filter **`lists.Test1.domain.servers.machine Equals Box1`**.
5. Click **Test**.
6. Check whether the data subset was accessed successfully by selecting the data source from an incident. You can see the results returned **`machine: Box1`**.
Apply transformers to extracted data
In general, in a playbook task, you can transform (apply changes) to the data you extracted. This also applies to working with lists, for example, to transform extracted data from a JSON object. In this example, we extract the first element in the list and transform the data to upper case from the list created in Extract data from a JSON object above.
1. Re-open the task, click the contents of the **value** field, and keep the current filters.
2. In the **Apply transformers on the field**, click **Add transformer**.
3. Add the following transformers to the extracted data:
1. Add the **`Get index (General)`** transformer to extract a specific machine element.
Set **`index: 0`** to extract the first element from the list.
2. Add the **`To upper case (String`**) transformer.
The **`To upper case (String)`** transformer does not work on lists, only on individual elements. Therefore, the **`Get index (General)`** transformer should be applied before adding the **`To upper case (String)`** transformer.
4. In the **Fetch Data** field, select anincident to test and click **Test**.
---
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