Custom fields

Custom fields extend Strapi’s capabilities by adding new types of fields to content-types and components. Once created or added to Strapi via plugins, custom fields can be used in the Content-Type Builder and Content Manager just like built-in fields.

The present documentation is intended for custom field creators: it describes which APIs and functions developers must use to create a new custom field. The user guide describes how to add and use custom fields from Strapi's admin panel.

It is recommended that you develop a dedicated plugin for custom fields. Custom field plugins include both a server and admin panel part. The custom field must be registered in both parts before it is usable in Strapi's admin panel.

Once created and used, custom fields are defined like any other attribute in the model's schema. An attribute using a custom field will have its type represented as customField (i.e. type: 'customField'). Depending on the custom field being used a few additional properties may be present in the attribute's definition (see models documentation).

✏️ NOTES

Though the recommended way to add a custom field is through creating a plugin, app-specific custom fields can also be registered within the global register function found in src/index.js and src/admin/app/js files.
Custom fields can only be shared using plugins.

Registering a custom field on the server

☑️ Prerequisites

Registering a custom field through a plugin requires creating and enabling a plugin (see Plugins development).

Strapi's server needs to be aware of all the custom fields to ensure that an attribute using a custom field is valid.

The strapi.customFields object exposes a register() method on the Strapi instance. This method is used to register custom fields on the server during the plugin's server register lifecycle.

strapi.customFields.register() registers one or several custom field(s) on the server by passing an object (or an array of objects) with the following parameters:

Parameter	Description	Type
`name`	The name of the custom field	`String`
`plugin` (optional)	The name of the plugin creating the custom fields	`String`
`type`	The data type the custom field will use	`String`
`inputSize` (optional)	Parameters to define the width of a custom field's input in the admin panel	`Object`

The optional inputSize object, when specified, must contain all of the following parameters:

Parameter	Description	Type
`default`	The default size in columns that the input field will occupy in the 12-column grid in the admin panel. The value can either be `4`, `6`, `8` or `12`.	`Integer`
`isResizable`	Whether the input can be resized or not	`Boolean`

✏️ Note

Currently, custom fields cannot add new data types to Strapi and must use existing, built-in Strapi data types described in the models' attributes documentation. Special data types unique to Strapi, such as relation, media, component, or dynamic zone data types, cannot be used in custom fields.

Example: Registering an example "color" custom field on the server:

In the following example, the color-picker plugin was created using the CLI generator (see plugins development):

./src/plugins/color-picker/server/register.js

'use strict';

module.exports = ({ strapi }) => {
  strapi.customFields.register({
    name: 'color',
    plugin: 'color-picker',
    type: 'string',
    inputSize: { // optional
      default: 4,
      isResizable: true,
    },
  });
};

The custom field could also be declared directly within the strapi-server.js file if you didn't have the plugin code scaffolded by the CLI generator:

./src/plugins/color-picker/strapi-server.js

module.exports = {
  register({ strapi }) {
    strapi.customFields.register({
      name: 'color',
      plugin: 'color-picker',
      type: 'text',
      inputSize: { // optional
        default: 4,
        isResizable: true,
      },
    });
  },
};

Registering a custom field in the admin panel

☑️ Prerequisites

Registering a custom field through a plugin requires creating and enabling a plugin (see Plugins development).

Custom fields must be registered in Strapi's admin panel to be available in the Content-type Builder and the Content Manager.

The app.customFields object exposes a register() method on the StrapiApp instance. This method is used to register custom fields in the admin panel during the plugin's admin register lifecycle.

app.customFields.register() registers one or several custom field(s) in the admin panel by passing an object (or an array of objects) with the following parameters:

Parameter	Description	Type
`name`	Name of the custom field	`String`
`pluginId` (optional)	Name of the plugin creating the custom field	`String`
`type`	Existing Strapi data type the custom field will use ❗️ Relations, media, components, or dynamic zones cannot be used.	`String`
`icon` (optional)	Icon for the custom field	`React.ComponentType`
`intlLabel`	Translation for the name	`IntlObject`
`intlDescription`	Translation for the description	`IntlObject`
`components`	Components needed to display the custom field in the Content Manager (see components)
`options` (optional)	Options to be used by the Content-type Builder (see options)	`Object`

Example: Registering an example "color" custom field in the admin panel:

In the following example, the color-picker plugin was created using the CLI generator (see plugins development):

./src/plugins/color-picker/admin/src/index.js

import ColorPickerIcon from './components/ColorPicker/ColorPickerIcon';

export default {
  register(app) {
    // ... app.addMenuLink() goes here
    // ... app.registerPlugin() goes here

    app.customFields.register({
      name: "color",
      pluginId: "color-picker", // the custom field is created by a color-picker plugin
      type: "string", // the color will be stored as a string
      intlLabel: {
        id: "color-picker.color.label",
        defaultMessage: "Color",
      },
      intlDescription: {
        id: "color-picker.color.description",
        defaultMessage: "Select any color",
      },
      icon: ColorPickerIcon, // don't forget to create/import your icon component 
      components: {
        Input: async () => import(/* webpackChunkName: "input-component" */ "./admin/src/components/Input"),
      },
      options: {
        // declare options here
      },
    });
  } 

  // ... bootstrap() goes here
};

Components

app.customFields.register() must pass a components object with an Input React component to use in the Content Manager's edit view.

Example: Registering an Input component

In the following example, the color-picker plugin was created using the CLI generator (see plugins development):

./src/plugins/color-picker/admin/src/index.js

export default {
  register(app) {
    app.customFields.register({
      // …
      components: {
        Input: async () => import(/* webpackChunkName: "input-component" */ "./Input"),
      } 
      // …
    });
  }
}

💡 Tip

The Input React component receives several props. The ColorPickerInput file in the Strapi codebase gives you an example of how they can be used.

Options

app.customFields.register() can pass an additional options object with the following parameters:

Options parameter	Description	Type
`base`	Settings available in the Base settings tab of the field in the Content-type Builder	`Object` or `Array of Objects`
`advanced`	Settings available in the Advanced settings tab of the field in the Content-type Builder	`Object` or `Array of Objects`
`validator`	Validator function returning an object, used to sanitize input. Uses a `yup` schema object.	`Function`

Both base and advanced settings accept an object or an array of objects, each object being a settings section. Each settings section could include:

a sectionTitle to declare the title of the section as an IntlObject
and a list of items as an array of objects.

Each object in the items array can contain the following parameters:

Items parameter	Description	Type
`name`	Label of the input. Must use the `options.settingName` format.	`String`
`description`	Description of the input to use in the Content-type Builder	`String`
`intlLabel`	Translation for the label of the input	`IntlObject`
`type`	Type of the input (e.g., `select`, `checkbox`)	`String`

Example: Declaring options for an example "color" custom field:

In the following example, the color-picker plugin was created using the CLI generator (see plugins development):

./src/plugins/color-picker/admin/src/index.js

// imports go here (ColorPickerIcon, pluginId, yup package…)

export default {
  register(app) {
    // ... app.addMenuLink() goes here
    // ... app.registerPlugin() goes here
    app.customFields.register({
    // …
      options: {
        base: [
          /*
            Declare settings to be added to the "Base settings" section
            of the field in the Content-Type Builder
          */
          {
            sectionTitle: { // Add a "Format" settings section
              id: 'color-picker.color.section.format',
              defaultMessage: 'Format',
            },
            items: [ // Add settings items to the section
              {
                /*
                  Add a "Color format" dropdown
                  to choose between 2 different format options
                  for the color value: hexadecimal or RGBA
                */
                intlLabel: {
                  id: 'color-picker.color.format.label',
                  defaultMessage: 'Color format',
                },
                name: 'options.format',
                type: 'select',
                value: 'hex', // option selected by default
                options: [ // List all available "Color format" options
                  {
                    key: 'hex',
                    defaultValue: 'hex',
                    metadatas: {
                      intlLabel: {
                        id: 'color-picker.color.format.hex',
                        defaultMessage: 'Hexadecimal',
                      },
                    },
                  },
                  {
                    key: 'rgba',
                    value: 'rgba',
                    metadatas: {
                      intlLabel: {
                        id: 'color-picker.color.format.rgba',
                        defaultMessage: 'RGBA',
                      },
                    },
                  },
                ],
              },
            ],
          },
        ],
        advanced: [
          /*
            Declare settings to be added to the "Advanced settings" section
            of the field in the Content-Type Builder
          */
        ],
        validator: args => ({
          format: yup.string().required({
            id: 'options.color-picker.format.error',
            defaultMessage: 'The color format is required',
          }),
        })
      },
    });
  }
}

💡 Tip

The Strapi codebase gives an example of how settings objects can be described: check the baseForm.js file for the base settings and the advancedForm.js file for the advanced settings. The base form lists the settings items inline but the advanced form gets the items from an attributeOptions.js file.

Custom fields

Registering a custom field on the server​

Registering a custom field in the admin panel​

Components​

Options​

Registering a custom field on the server

Registering a custom field in the admin panel

Components

Options