Field Mapper Configuration

Updated 6 months ago by Karan

The field mapper is used to map data between the integrations you work on during the node configuration. It is used in all update nodes, including Airtable Update, Webflow CMS update, Knack update, Infinity update. 

In this documentation, we’ll explain how to configure a field mapper. 

How does it work?

The field mapper lets you handle both the updates and inserts in the integration. It first retrieves the data from the integration through an HTTP Get call. An update request is executed for the existing data on the integration service, but if the data doesn't exist, the insert command is executed.

Add Update task to a flow

Let’s assume we’re configuring a field mapper for Webflow - Update Items node. 

Step 1: Select Webflow - Update Items node to configure the field mapper in the Byteline flow designer console.

Step 2: Click on the edit button of the Webflow - Update Items node for configuration.

Let’s start field mapper configuration.

Field Mapper Configuration

In this section, we will learn to configure each of the column’s data irrespective of their collection field. Byteline populates the Field Names for which data needs to be configured. If any field is missing, you can add it using the + button.

Review data types

We do our best to show the correct data type for each auto-populated field. You should review it once to ensure it's the correct one. If not, you can easily change it by picking the correct data type from the left of the text field.

Please note that data types are not available for all the tasks. It's shown only when we cannot accurately determine the data type.

Configuring mapped expressions

Step 1: Click on the respective Selector button to fetch the array path in the Value field of the Name column.

Step 2: Click on the variable to pick its path.

Note: The column with an asterisk means these are the required fields so, you have to define the mapping for them. 
Configuring Matching Fields

Matching fields set forms a unique identifier for each record. You can mark multiple fields as matching fields. These fields are compared to their values on the integration service, such as Airtable, to figure out whether we need to create or update a record.

Refresh fields

If you have deleted a field from the mapper, you can use "Refresh fields" button to bring it back. You can also use it to get new fields that are added after configuring the task.


Click on the Collapse button to explore all the advanced options to manage your Airtable data, which includes:

  • Filter Existing Items
  • Updates
  • Deleted At Source

Filtering Existing Items

Filter the records that you want to consider for figuring out whether to create, update or delete records. Select the None option if you don't want to apply the filter to the records.

Select the Filter option to apply the filter to the required existing records.

In the first field, enter the column id to which you want to apply the filter.

You can choose to filter the existing items based on various parameters, including:

  • Equals To
  • Not Equals To
  • Contains
  • Not Contains

Enter the Value of the column for applying the filter.


To manage the existing records, you can select one of the below-discussed update strategies:

  • Skip Updates
  • Overwrite
  • Overwrite When

Select the Skip Updates option in case you don't want any data updates on your existing records.

Select the Overwrite option to replace old items with the new data when required.

Select the Overwrite When the option to set a specific condition based on which the update should be performed.

Deleted at Source

When a record has been deleted from the source data but it still exists in your integration e.g. Webflow, then you can decide how to manage it.

If you select the ignore option, no data is deleted.

Select the Set a Column Value option to set a column to a specific value for deletion. For example, you can configure to set the status column to expire.

Click on the Save button to save the configuration.

This way, you can map field values for Airtable Update, Knack update, Infinity update. 

Feel free to connect us with any doubts.

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