---
title: "Create Managed Property"
method: POST
path: "/api/v1/ontology/entities/{entity_id}/properties"
tags: ["ontology-entities"]
---

# Create Managed Property

`POST /api/v1/ontology/entities/{entity_id}/properties`

Add a managed (admin-defined) property to an entity.

## Path parameters

- `entity_id` string, uuid, required

## Request body

- ManagedPropertyCreate — Input for POST /ontology/entities/{id}/properties (managed fields only).
  - `column_name` string, required
  - `display_name` string
  - `data_type` string
  - `managed_default` unknown
  - `rules` FieldRules — Declared value rules for one entity field. Empty instance = no rules.
    - `allowed_values` string[], nullable
    - `required` boolean
    - `format` FieldFormat — Type-specific value constraints. All optional; only set what applies.
      - `min` number, nullable
      - `max` number, nullable
      - `regex` string, nullable
      - `max_length` integer, nullable
      - `date_min` string, nullable
      - `date_max` string, nullable
      - `allowed_mime` string[], nullable
      - `max_size_bytes` integer, nullable
  - `file_folder_id` string, uuid, nullable

## Response `201`

Successful Response

- EntityPropertyRead — Property in entity listings.
  - `id` string, uuid, required
  - `column_name` string, required
  - `display_name` string, required
  - `description` string, required
  - `data_type` string, required
  - `is_primary_key` boolean, required
  - `order` integer, required
  - `rules` FieldRules — Declared value rules for one entity field. Empty instance = no rules.
    - `allowed_values` string[], nullable
    - `required` boolean
    - `format` FieldFormat — Type-specific value constraints. All optional; only set what applies.
      - `min` number, nullable
      - `max` number, nullable
      - `regex` string, nullable
      - `max_length` integer, nullable
      - `date_min` string, nullable
      - `date_max` string, nullable
      - `allowed_mime` string[], nullable
      - `max_size_bytes` integer, nullable
  - `origin` string
  - `managed_default` unknown
  - `file_folder_id` string, uuid, nullable

## Other responses

- `422` — Validation Error

---

[API](https://skmtc.net/netter/apis/dmi-backend.md) · [All operations](https://skmtc.net/netter/apis/dmi-backend/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/netter/dmi-backend/versions/a59877bf911b/schema)