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Upgrading Code Snippets Module to Drupal 8: Creating a Custom Field
Field types, widgets, and formatters are plugins
Field types, widgets, and formatters are plugins.
Create a custom field type
Field types define the properties and behaviors of fields
Create a custom field widget
Field widgets are used to render the field inside forms.
Create a custom field formatter
The field formatter formats the field data to be viewed by the end user.
