---
title: Prohibited keywords
description: The Edge Encryption proxy validates encryption rule scripts before saving the rule. Many JavaScript keywords aren’t allowed in encryption rule scripts.
locale: en-US
canonical_url: https://www.servicenow.com/docs/r/australia/platform-security/edge-encryption/r\_ProhibitedKeywords.html
release: australia
product: Edge Encryption
classification: edge-encryption
topic_type: reference
last_updated: "2026-03-12"
reading_time_minutes: 1
breadcrumb: [Encryption rule objects and APIs, Define a custom encryption rule, Configuring Edge Encryption, Edge Encryption, Encryption]
---

# Prohibited keywords

The Edge Encryption proxy validates encryption rule scripts before saving the rule. Many JavaScript keywords aren’t allowed in encryption rule scripts.

|Keyword|
|-------|
|\_\_DIR\_\_|
|\_\_FILE\_\_|
|\_\_LINE\_\_|
|\_\_parent\_\_|
|\_\_proto\_\_|
|Error|
|eval|
|getClass|
|getPrototypeOf|
|Java|
|javax|
|javafx|
|JavaImporter|
|load|
|loadWithNewGlobal|
|new|
|Packages|
|Object|
|prototype|
|RegExp|
|setPrototypeOf|
|this|
|throw|

**Parent Topic:**[Encryption rule objects and APIs](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/australia/platform-security/edge-encryption/api-overview.md)