---
title: "Update a custom field"
method: PATCH
path: "/contacts/{id}/custom-fields/{fieldId}"
tags: ["Contacts"]
---

# Update a custom field

`PATCH /contacts/{id}/custom-fields/{fieldId}`

## Request

- Base URL: `https://mobcrm.au/api/v1`
- URL: `https://mobcrm.au/api/v1/contacts/{id}/custom-fields/{fieldId}`
- Auth: HTTP bearer

## Request body

- CustomField
  - `field_name` string, required
  - `field_value` string, required
  - `field_group` string

## Response `200`

Updated custom field.

- object
  - `data` object, required

## Other responses

- `401`: Missing, malformed, or invalid bearer token.
- `403`: Token lacks the required scope or plan entitlement.
- `404`: The requested resource does not exist.
- `422`: Request body or query failed validation.
- `429`: Rate limit exceeded; see the Retry-After header.

---

[API](https://skmtc.dev/mobcrm/apis/mob-crm-public-api.md) · [All operations](https://skmtc.dev/mobcrm/apis/mob-crm-public-api/llms.txt) · [OpenAPI document](https://skmtc.dev/mobcrm/apis/mob-crm-public-api/revisions/697e8afba2a5?raw)