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Custom objects are new record types your app adds to a workspace — Post Card, Invoice, Subscription, anything specific to your domain. Each object declares its schema (fields, relations, default values) and a stable universal identifier that survives across syncs and deploys.
src/objects/post-card.object.ts
import { defineObject, FieldType } from 'twenty-sdk/define';

enum PostCardStatus {
  DRAFT = 'DRAFT',
  SENT = 'SENT',
  DELIVERED = 'DELIVERED',
  RETURNED = 'RETURNED',
}

export default defineObject({
  universalIdentifier: '54b589ca-eeed-4950-a176-358418b85c05',
  nameSingular: 'postCard',
  namePlural: 'postCards',
  labelSingular: 'Post Card',
  labelPlural: 'Post Cards',
  description: 'A post card object',
  icon: 'IconMail',
  fields: [
    {
      universalIdentifier: '58a0a314-d7ea-4865-9850-7fb84e72f30b',
      name: 'content',
      type: FieldType.TEXT,
      label: 'Content',
      description: "Postcard's content",
      icon: 'IconAbc',
    },
    {
      universalIdentifier: 'c6aa31f3-da76-4ac6-889f-475e226009ac',
      name: 'recipientName',
      type: FieldType.FULL_NAME,
      label: 'Recipient name',
      icon: 'IconUser',
    },
    {
      universalIdentifier: '95045777-a0ad-49ec-98f9-22f9fc0c8266',
      name: 'recipientAddress',
      type: FieldType.ADDRESS,
      label: 'Recipient address',
      icon: 'IconHome',
    },
    {
      universalIdentifier: '87b675b8-dd8c-4448-b4ca-20e5a2234a1e',
      name: 'status',
      type: FieldType.SELECT,
      label: 'Status',
      icon: 'IconSend',
      defaultValue: `'${PostCardStatus.DRAFT}'`,
      options: [
        { value: PostCardStatus.DRAFT, label: 'Draft', position: 0, color: 'gray' },
        { value: PostCardStatus.SENT, label: 'Sent', position: 1, color: 'orange' },
        { value: PostCardStatus.DELIVERED, label: 'Delivered', position: 2, color: 'green' },
        { value: PostCardStatus.RETURNED, label: 'Returned', position: 3, color: 'orange' },
      ],
    },
    {
      universalIdentifier: 'e06abe72-5b44-4e7f-93be-afc185a3c433',
      name: 'deliveredAt',
      type: FieldType.DATE_TIME,
      label: 'Delivered at',
      icon: 'IconCheck',
      isNullable: true,
      defaultValue: null,
    },
  ],
});

​
Key points

  • The universalIdentifier must be unique and stable across deployments.
  • Each field requires a name, type, label, and its own stable universalIdentifier.
  • The fields array is optional — you can define objects without custom fields.
  • Inline fields defined here do not need an objectUniversalIdentifier — it’s inherited from the parent object. Use defineField() to add fields to objects you don’t own.
  • You can scaffold new objects with yarn twenty dev:add object, which guides you through naming, fields, and relationships. See Architecture → Scaffolding entities.
Base fields are added automatically. When you define a custom object, Twenty creates standard fields like id, name, createdAt, updatedAt, createdBy, updatedBy, and deletedAt for you. You don’t need to declare them in your fields array — only your custom fields. You can override a default field by declaring one with the same name, but this is rarely a good idea.

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Default values

Literal string defaults must be wrapped in single quotes inside the string — defaultValue: "'Draft'", not defaultValue: "Draft". That’s why the status field above uses `'${PostCardStatus.DRAFT}'`. Unquoted strings are reserved for computed defaults, evaluated when a record is created:
  • 'uuid' — generates a UUID (for UUID fields)
  • 'now' — the current timestamp (for DATE_TIME fields)
The same convention applies to string sub-fields of composite defaults (e.g. { source: "'MANUAL'" } on an ACTOR field) and to SELECT/MULTI_SELECT values. A literal string default left unquoted raises a warning when your app is built.

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What’s next

  • Connect this object to others — see Relations for the bidirectional relation pattern.
  • Add fields to objects from other apps — see Extending Objects for defineField().
  • Display this object in the UI — see Views and Navigation Menu Items to put it in the sidebar.