---
title: "Update field"
method: PATCH
path: "/v1/fields/{identifier}"
tags: ["Fields"]
---

# Update field

`PATCH /v1/fields/{identifier}`

Update a custom field definition by ID or key. Type and options cannot be changed after values have been saved.

## Path parameters

- `identifier` string, required — Field ID or key

## Request body

- UpdateFieldBody
  - `key` string
  - `name` string
  - `description` string, nullable
  - `type` 'text' | 'number' | 'boolean' | 'date' | 'richtext' | 'select' | 'multiselect'
  - `required` boolean
  - `options` FieldOptionInput[] — Replacement option list. Only valid for select and multiselect fields.
    - `value` string, required
    - `label` string, required

## Response `200`

Field updated successfully

- FieldResponse
  - `field` Field, required
    - `id` string, required
    - `key` string, required
    - `name` string, required
    - `description` string, nullable, required
    - `type` 'text' | 'number' | 'boolean' | 'date' | 'richtext' | 'select' | 'multiselect', required
    - `required` boolean, required
    - `position` integer, required
    - `options` FieldOption[], required
      - `id` string, required
      - `value` string, required
      - `label` string, required
      - `position` integer, required
      - `createdAt` string, date-time, required
      - `updatedAt` string, date-time, required
    - `createdAt` string, date-time, required
    - `updatedAt` string, date-time, required

## Other responses

- `400` — Invalid request body or unsafe schema change
- `403` — API key missing the required field write scope
- `404` — Field not found
- `409` — Field key conflict
- `500` — Server error

---

[API](https://skmtc.dev/marblecms/apis/marble-api.md) · [All operations](https://skmtc.dev/marblecms/apis/marble-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/marblecms/marble-api/revisions/ce3a22722c0e/schema)