diff --git a/src/Helper/Helper_Options_Fields.php b/src/Helper/Helper_Options_Fields.php
index ae2e29a83..fa65bdad0 100644
--- a/src/Helper/Helper_Options_Fields.php
+++ b/src/Helper/Helper_Options_Fields.php
@@ -380,14 +380,17 @@ public function get_registered_fields() {
 										'additionalProperties' => false,
 										'properties' => [
 											'fieldId'  => [
-												'type' => 'string',
+												'type'     => 'string',
+												'required' => true,
 											],
 											'operator' => [
-												'type' => 'string',
-												'enum' => [ 'is', 'isnot', '<>', 'not in', 'in', '>', '<', 'contains', 'starts_with', 'ends_with', 'like', '>=', '<=' ],
+												'type'     => 'string',
+												'enum'     => [ 'is', 'isnot', '<>', 'not in', 'in', '>', '<', 'contains', 'starts_with', 'ends_with', 'like', '>=', '<=' ],
+												'required' => true,
 											],
 											'value'    => [
-												'type' => 'string',
+												'type'     => 'string',
+												'required' => true,
 											],
 										],
 									],
diff --git a/tests/phpunit/integration/Rest/Test_Rest_Form_Settings.php b/tests/phpunit/integration/Rest/Test_Rest_Form_Settings.php
index 900ba8451..ce123761e 100644
--- a/tests/phpunit/integration/Rest/Test_Rest_Form_Settings.php
+++ b/tests/phpunit/integration/Rest/Test_Rest_Form_Settings.php
@@ -811,6 +811,12 @@ public function test_get_item_schema() {
 		$this->assertArrayHasKey( 'logicType', $args['conditionalLogic']['properties'] );
 		$this->assertArrayHasKey( 'rules', $args['conditionalLogic']['properties'] );
 
+		/* Each conditional logic rule property should be flagged as required in the schema */
+		$rule_properties = $args['conditionalLogic']['properties']['rules']['items']['properties'];
+		$this->assertTrue( $rule_properties['fieldId']['required'] );
+		$this->assertTrue( $rule_properties['operator']['required'] );
+		$this->assertTrue( $rule_properties['value']['required'] );
+
 		$this->assertContains( 'A4', $args['pdf_size']['enum'] );
 		$this->assertContains( 'CUSTOM', $args['pdf_size']['enum'] );
 
@@ -945,6 +951,35 @@ public function test_input_validation_update() {
 		$this->assertSame( 'rest_invalid_hex_color', $data['data']['details']['font_colour']['code'] );
 	}
 
+	/**
+	 * Check the REST API rejects conditional logic rules that are missing a required property
+	 */
+	public function test_input_validation_conditional_logic_rule_required() {
+		wp_set_current_user( self::$admin_id );
+
+		$request = new WP_REST_Request( 'POST', '/gravity-pdf/v1/form/' . $this->form_id );
+		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
+
+		/* The single rule omits the required "value" property */
+		$request->set_body_params( [
+			'name'             => 'Label',
+			'template'         => 'rubix',
+			'conditionalLogic' => [
+				'actionType' => 'show',
+				'logicType'  => 'any',
+				'rules'      => [
+					[ 'fieldId' => '7', 'operator' => 'is' ],
+				],
+			],
+		] );
+
+		$response = rest_get_server()->dispatch( $request );
+		$data     = $response->get_data();
+
+		$this->assertSame( 400, $response->get_status() );
+		$this->assertSame( 'rest_property_required', $data['data']['details']['conditionalLogic']['code'] );
+	}
+
 	/**
 	 * Check the REST API auto-validates inputs on the DELETE endpoint
 	 */