How do I use Ninja Forms's Update Field ability with AI?

Install the Easy MCP AI WordPress plugin alongside Ninja Forms, connect your AI client, then ask in natural language — for example: "On form 12, make the Phone field optional and change its placeholder to '(555) 555-5555'."

Update Field is a WordPress ability from Ninja Forms — usable via Easy MCP AI, which connects Claude, ChatGPT, and any AI assistant to your site.

Install Free Plugin →

Update Field

Write

Ninja Forms Forms ninjaforms/update-field

Update an existing field's label, key, requirement, placeholder, default value, or options.

Requires the Ninja Forms plugin on WordPress 6.9+ for the Abilities API (all 32 abilities are registered only when the wp_register_ability() function exists, via NF_Abilities_Integration::load_abilities_api() running on plugins_loaded). Every ability is gated by the same ninja_forms_ability_can_manage_forms() permission callback, requiring the caller to hold WordPress's manage_options capability or Ninja Forms' own nf_edit_forms capability.

What it does

This ability changes one field on one form, identified by the combination of form_id and field_id — both are required, and the field_id alone is not enough. Only the properties supplied (label, key, required, placeholder, default_value, help_text, admin_label, order, options) are updated; anything omitted stays as-is. Options (for select/radio/checkbox-style fields) are replaced wholesale when provided, each with a label, value, and optional calc key for use in calculator equations. An AI assistant would typically call ninjaforms/get-form first to resolve the correct field_id from the user's description of the field before calling this.

See it in action

You ask your AI assistant

"On form 12, make the Phone field optional and change its placeholder to '(555) 555-5555'."

Inputs

Name	Type	Required	Description
form_id	integer	Yes	Form ID containing the field.
field_id	integer	Yes	The numeric ID of the field to update.
label	string	No	Field label.
key	string	No	Field key/name, used in merge tags.
required	boolean	No	Whether the field is required.
placeholder	string	No	Placeholder text.
default_value	string	No	Default value.
help_text	string	No	Help text shown with the field.
admin_label	string	No	Label shown in the admin/submissions view.
order	integer	No	Field order/position.
options	array	No	Replacement option list for select/radio/checkbox fields, each with label, value, and optional calc key.

Returns

An object with a 'success' boolean, the 'form_id', 'field_id', an 'updated' object of the changed settings, and a 'message'.

Permission

The current user must have WordPress's 'manage_options' capability or Ninja Forms' own 'nf_edit_forms' capability (checked via the shared ninja_forms_ability_can_manage_forms() permission callback).

More Ninja Forms abilities

Add Action

Add a post-submission action to a form — email, redirect, success message, or save.

Write

Add Calculation

Add a calculator formula to a form for use in calc fields and conditional logic.

Write

Add Field

Add a single field to an existing form, to be called once per field when building out a form.

Write

Create Form

Create a new Ninja Forms form, optionally with fields, actions, and calculations, in a single call.

Write

Delete Action

Permanently delete an action from a form.

Destructive

Delete Calculation

Permanently delete a calculation from a form.

Destructive