domainlockjs.com

What It Is

DomainLockJS is a domain-locking script generator for JavaScript files. After users enter a website domain, it generates an encrypted code snippet that developers can copy into an existing JS file. When the script runs on an unauthorized domain, it triggers hard-to-trace errors. Its positioning is not “strong security” or DRM, but rather a way to increase the debugging cost for code theft, hotlinking, and unauthorized redistribution.

Core Capabilities

Its main use cases include site-licensed web software, JavaScript plugins, and custom codebases delivered to clients. According to the official description, its payload creates errors inside unrelated functions, making it difficult for copycats to directly locate the protection snippet. The snippet is under 2KB, has no dependencies, creates no global variables, and is typically integrated into any JS file via copy and paste; it can also be placed in multiple files. The limitations are also clear: it can only lock the root domain, not specific subdomains; and any client-side JavaScript solution can be bypassed by an experienced developer.

Pricing and Licensing

The generated code snippets are released under the CC0 license, so they can be used for free in both personal and commercial projects with no attribution required. The website follows a CoffeeWare model and encourages users to donate via a donate button, but it does not disclose specific payment methods or paid plans. It is not stated whether the generator itself is open source, self-hostable, or available via an API.

Pros and Cons

The advantages are that it is extremely quick to get started with, costs nothing, and has minimal impact on frameworks, making it suitable as a basic anti-copying layer. The author also clearly discloses its security boundaries, avoiding misleading claims. The downsides are that its functionality is narrow and cannot replace a license server, backend verification, account-based authorization, or a code obfuscation system. The documentation mainly consists of a single-page explanation and FAQ, with little guidance on build-tool integration, automated generation, troubleshooting exceptions, or advanced deployment.

Who It’s For and Access from China

It is suitable for indie developers, small software vendors, and teams selling frontend plugins or custom website code who want to deter low-effort copying and casual resale. It is not suitable for commercial software that requires strong authorization, auditing, revocation, billing, or compliance controls. The main text does not provide information about access from mainland China, and payments are only mentioned as a donation button, so this needs to be verified in practice. If access or donations are restricted, alternatives include JS obfuscation, private package distribution, backend license verification, or commercial licensing platforms.