Prevent a field from being returned by Caldera Forms REST API See: https://calderaforms.com/doc/caldera_forms_api_show_field/

hide-field-by-type.php

<?php
/**
 * Don't return email fields in Caldera Forms REST API responses.
 *
 * Will affect front-end entry viewer
 */
add_filter( 'caldera_forms_api_show_field', function( $show, $field_id, $field, $form ){
	if( 'email' === Caldera_Forms_Field_Util::get_type( $field, $form ) ){
		$show = false;
	}

	return $show;

}, 10, 4 );

hide-field-from-api.php

<?php
/**
 * Don't return a field, with a given ID, in Caldera Forms REST API responses.
 *
 * Will affect front-end entry viewer
 */
add_filter( 'caldera_forms_api_show_field', function( $show, $field_id ){
	if( 'fld_9970286' ==$field_id ){
		return false;
	}



	return true;

}, 10, 2 );

hide-fields-in-form-request.php

<?php
/**
 * Don't show any fields in API requests for forms
 *
 * Will probably break front-end entry viewer
 */
add_filter( 'caldera_forms_api_show_field', function( $show, $field_id, $field, $form, WP_REST_Request $request ){

	if( 0 === strpos(  $request->get_route(), '/cf-api/v2/forms/'  ) ){
		return false;
	}

	return $show;

}, 10, 5 );