# Contact custom fields

HighLevel custom fields allow you to map non-standard data from your source app to HighLevel. Follow the instructions in the linked article to learn how to setup custom fields in your HighLevel instance: <https://help.gohighlevel.com/support/solutions/articles/48001161579-how-to-use-custom-fields>

### Custom field mapping in Middle

Within the action to update or create a contact in HighLevel, you can construct an array of key-value pair objects to map integrated data to your custom fields.

{% hint style="warning" %}
You will need to use the unique key for the custom field (leave out the curly braces) for the field key in your Middle workflow
{% endhint %}

<figure><img src="/files/qks39JSLUVdwu2g4tChE" alt=""><figcaption><p>Example of a key-value pair object array mapping data to HighLevel custom fields</p></figcaption></figure>

To create this array, follow the below steps:

1. Create a new action node in your workflow and then select the action to create or update a contact in HighLevel
2. Click to create a new parameter under **Custom Fields**
3. Click to [construct an array](/middle-docs/building-workflows/workflow-parameters.md#advanced-parameters)
4. Add a new parameter within this array
5. Click to [construct an object](/middle-docs/building-workflows/workflow-parameters.md#advanced-parameters)
6. This will give you an object where you can add a [text box](/middle-docs/building-workflows/workflow-parameters.md#constant-and-calculated-values) to the custom field key and then map your data in the value

{% hint style="success" %}
This input parameter can accept all data types. If you receive a data type error in the workflow editor, you can feel free to ignore it.
{% endhint %}


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