---
page_type: error
code: 19011
message: >-
  19011: When updating a contact, invalid JSON syntax or invalid field that
  cannot be updated by this endpoint
level: ERROR
---

## Description

Invalid JSON or fields other than first\_name, middle\_name, last\_name, legal\_name, preferred\_name, unique\_customer\_provided\_id or custom\_fields exist in update contact request

### Possible Causes

User provided an invalid JSON or trying to update fields other than first\_name, middle\_name, last\_name, legal\_name, preferred\_name, unique\_customer\_provided\_id or custom\_fields of a contact

### Possible Solutions

Fix JSON input or change update contact request to update only first\_name, middle\_name, last\_name, legal\_name, preferred\_name, unique\_customer\_provided\_id or custom\_fields