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Custom types

Custom types allow you to define reusable objects which include multiple variable fields. They are defined in a theme in the types directory as individual json files, which can then be referred to in any block schema using the custom type’s key.

Custom type structure

All custom types expect the following key-value pairs:


The custom type’s unique key, used in the block schema to reference the custom type.


The name of the custom type shown to the Creator in the site builder.


An array of Variable objects, defining the individual variable fields to be included in the custom type.

e.g. For a file my-theme/types/my_custom_type.json
  "key": "my_custom_type",
  "name": "My custom type",
  "attributes": [
      "name": "label",
      "type": "string"
      "name": "link",
      "type": "link"
      "name": "style",
      "type": "select",
      "options": [
          "label": "primary",
          "value": "btn-primary"
          "label": "secondary",
          "value": "btn-secondary"

Updating custom types

After a custom type has been created, existing attributes cannot be removed and an attribute’s name and type cannot be changed. Additional attributes can be added to existing custom types.

Deleting custom types

A custom type can only be deleted if it is not referenced in any theme blocks or blocks added to Creator websites.

The above restrictions are in place to ensure that changes are not made to custom types on which existing blocks depend.

Backwards compatibility of custom types

A custom type can be added to a theme repository after a Creator has chosen that theme for their Site. Once added, blocks or templates can be added or updated to use the new custom type. However, the custom type will not appear in the Theme > Custom Types tab of the Palette.