## Definitions

**get** `/v1/accounts/definitions`

Returns the schema for all field and relationship definitions available on accounts, including both system-defined and custom fields. Useful for understanding the shape of account data before creating or updating records. See <u>[Fields and relationships](/using-the-api/fields-and-relationships/)</u> for more details.

**[Required scope](/using-the-api/scopes/):** `accounts:read`

**[Rate limit category](/using-the-api/rate-limits/):** Read

### Returns

- `AccountDefinitionsResponse = object { fieldDefinitions, objectType, relationshipDefinitions }`

  - `fieldDefinitions: map[object { description, label, typeConfiguration, 3 more } ]`

    Map of field keys to their definitions, including both system and custom fields.

    - `description: string`

      Description of the field, or null.

    - `label: string`

      Human-readable display name of the field.

    - `typeConfiguration: map[string or number or boolean or 2 more]`

      Type-specific configuration (e.g. select options, currency code).

      - `UnionMember0 = string`

      - `UnionMember1 = number`

      - `UnionMember2 = boolean`

      - `UnionMember3 = array of string or number or boolean or 2 more`

        - `UnionMember0 = string`

        - `UnionMember1 = number`

        - `UnionMember2 = boolean`

        - `UnionMember3 = array of unknown`

        - `UnionMember4 = map[unknown]`

      - `UnionMember4 = map[string or number or boolean or 2 more]`

        - `UnionMember0 = string`

        - `UnionMember1 = number`

        - `UnionMember2 = boolean`

        - `UnionMember3 = array of unknown`

        - `UnionMember4 = map[unknown]`

    - `valueType: "ADDRESS" or "CHECKBOX" or "CURRENCY" or 11 more`

      Data type of the field.

      - `"ADDRESS"`

      - `"CHECKBOX"`

      - `"CURRENCY"`

      - `"DATETIME"`

      - `"EMAIL"`

      - `"FULL_NAME"`

      - `"MARKDOWN"`

      - `"MULTI_SELECT"`

      - `"NUMBER"`

      - `"SINGLE_SELECT"`

      - `"SOCIAL_HANDLE"`

      - `"TELEPHONE"`

      - `"TEXT"`

      - `"URL"`

    - `id: optional string`

      Unique identifier of the field definition.

    - `readOnly: optional boolean`

      `true` for fields that are not writable via the API (e.g. AI-generated summaries). `false` or absent for writable fields.

  - `objectType: string`

    The object type these definitions belong to (e.g. `account`).

  - `relationshipDefinitions: map[object { cardinality, description, label, 2 more } ]`

    Map of relationship keys to their definitions.

    - `cardinality: "HAS_ONE" or "HAS_MANY"`

      Whether this is a `has_one` or `has_many` relationship.

      - `"HAS_ONE"`

      - `"HAS_MANY"`

    - `description: string`

      Description of the relationship, or null.

    - `label: string`

      Human-readable display name of the relationship.

    - `objectType: string`

      The type of the related object (e.g. `account`, `contact`).

    - `id: optional string`

      Unique identifier of the relationship definition.

### Example

```http
curl https://api.lightfield.app/v1/accounts/definitions \
    -H 'Lightfield-Version: 2026-03-01' \
    -H "Authorization: Bearer $API_KEY"
```