Introducing AfterPack: Protect Your JavaScript from Reverse Engineering and AI Analysis
DataUnlocker has been protecting your web app's network communication from tampering – ensuring browser extensions, ad blockers, VPNs, antivirus software, and network-level filters can't block or manipulate your requests and responses.
Now we're adding the next layer of protection: code obfuscation.
Today we're announcing AfterPack – a next-generation JavaScript obfuscator that protects your source code from reverse engineering and AI analysis. Together with DataUnlocker, it completes the protection stack for your web application.
Network protection (DataUnlocker) + Code protection (AfterPack) = Complete web app security.
Why code protection matters
DataUnlocker protects your web application's network communication from a wide range of threats: browser extensions, ad blockers, VPNs, antivirus software, corporate proxies, and router-level filters. Any software that can intercept or modify HTTP requests – despite HTTPS end-to-end encryption – gets neutralized by DataUnlocker's network obfuscation.
But there's another attack surface: your source code itself.
Every JavaScript file you ship to the browser is readable. Extensions can analyze your code to understand how to circumvent your protections. Security scanners can map your attack surface. AI tools can reverse-engineer your business logic in seconds. Competitors can study your implementation and clone your features.
Readable code is vulnerable code. Here's what you're exposed to:
- Security scanners mapping your attack surface by analyzing code patterns
- AI code analysis – GPT-4 explains minified code in seconds, making reverse engineering trivial
- Crackers & pirates bypassing license checks and anti-cheat by studying your logic
- Secrets exposure – even accidentally included secrets stay hidden from bots, scrapers, and analyzers
- Business logic theft – feature flags, pricing algorithms, proprietary formulas exposed
- Tech stack fingerprinting – tools identifying your frameworks and versions to find vulnerabilities
- Copycat competitors replicating what they can read
- AI data harvesting – crawlers using your site as LLM training data
For DataUnlocker users specifically: if your code is readable, extensions can analyze exactly how you're protecting your network requests – and adapt their blocking strategies. Code obfuscation closes this gap.
Meet AfterPack
AfterPack is a JavaScript obfuscator built from first principles for the AI era. Instead of relying on visual complexity (which AI easily defeats), it uses techniques that fundamentally resist machine analysis.
Key differentiators:
Built in Rust for speed
AfterPack is written in Rust, making it significantly faster than JavaScript-based obfuscators. This matters for production builds where every second counts, especially for large codebases with thousands of modules.
Framework-aware transformations
Unlike generic obfuscators that treat all JavaScript the same, AfterPack understands modern frameworks. It knows how to obfuscate Next.js, Vite, Nuxt, and Remix applications without breaking server-side rendering, hydration, or framework-specific patterns.
CSP compliant
Many obfuscators break Content Security Policy by generating dynamic code evaluation. AfterPack produces output that works with strict CSP configurations – no eval(), no Function() constructor, no security compromises.
Edge-compatible
Deploy anywhere. AfterPack's output runs on Cloudflare Workers, Vercel Edge, Deno Deploy, and any other edge runtime without modification.
Polymorphic output
Every build produces different obfuscated code for the same input. This prevents pattern-based detection and makes it impossible to build universal deobfuscation tools for AfterPack output.
Complete protection for your web app
DataUnlocker and AfterPack form a complete protection stack for client-side JavaScript:
Network Obfuscation (DataUnlocker) – Your app's requests and responses can't be blocked or manipulated by browser extensions, ad blockers, VPNs, antivirus software, or network-level filters.
Code Obfuscation (AfterPack) – Your source code can't be understood, reverse-engineered, or analyzed by AI. Your business logic stays private.
Together, they ensure no external influence can affect your web application.
Years of building DataUnlocker's network protection taught us how determined adversaries operate in the browser. We've seen how filter lists evolve, how detection scripts probe for patterns, and how the cat-and-mouse game constantly escalates.
That experience is driving AfterPack's design:
- Deep knowledge of browser internals – understanding what's truly hard to detect vs. what just looks complex
- Production-grade engineering – obfuscation that works at scale without breaking builds or degrading performance
- Real-world adversarial thinking – techniques designed to resist actual reverse engineering attempts
Pricing that makes sense
AfterPack Free – production-ready protection at no cost:
- MIT-licensed binary
- Unlimited builds
- All basic transforms
- Source maps
- Framework presets for Next.js, Vite, Nuxt, and more
- Per-file obfuscation
No artificial limits, no trial periods, no surprise paywalls.
AfterPack Pro (from $39/month) – for teams and SaaS products that need maximum security:
- Cross-module obfuscation – understands relationships between your modules for deeper protection
- FlowMorph transforms
- Browser API locking
- Managed source maps
- Private Pro runtime
- Priority email support (8h response)
AfterPack Enterprise – for organizations with strict compliance needs:
- Isolated Enterprise Runtime – your code is processed in your own cloud infrastructure
- Dedicated success team
- SLA guarantee
- Audit logs & compliance
- Custom MSA / SOW
For most projects, the free tier is more than sufficient. We believe security shouldn't be a premium – everyone deserves protection from code theft and AI analysis.
Join the waitlist
AfterPack is coming soon. Join the waitlist to be first in line when we launch.
Why join the waitlist?
- Get early access before public launch
- Shape the product with your feedback
- Lock in founding member pricing (the price won't grow for you)
- Direct access to the team for integration support
The waitlist is free – we'll notify you as soon as AfterPack is ready.
Frequently Asked Questions
Does JavaScript obfuscation slow down my app?
AfterPack is designed for production use. While obfuscated code includes additional transformations, the performance impact is minimal for most applications. The Rust-based compiler produces optimized output, and framework-aware transformations avoid breaking optimizations your bundler already applied. For performance-critical paths, you can exclude specific files from obfuscation.
Can AI still reverse engineer obfuscated code?
No obfuscation is 100% unbreakable, but AfterPack significantly raises the bar. Unlike traditional obfuscators that rely on visual complexity (which AI easily defeats), AfterPack uses techniques specifically designed to resist machine analysis. Polymorphic output means every build is different, preventing pattern-based deobfuscation tools from working reliably.
Is obfuscation enough to protect my source code?
Obfuscation is one layer of defense. For complete protection, combine code obfuscation (AfterPack) with network obfuscation (DataUnlocker). This prevents both code analysis and network-level tampering. Additionally, keep sensitive business logic on your server when possible – obfuscation protects what must run client-side.
Does AfterPack work with TypeScript?
Yes. AfterPack works with any JavaScript output, regardless of whether your source is TypeScript, JSX, or plain JavaScript. It integrates into your build pipeline after TypeScript compilation, so your existing workflow stays unchanged. Framework presets for Next.js, Vite, and Nuxt handle TypeScript projects automatically.
Complete protection stack
| Layer | What it protects | Tool |
|---|---|---|
| Code Obfuscation | Your app's logic and business rules | AfterPack |
| Network Obfuscation | Your app's requests and responses from extensions, VPNs, and network filters | DataUnlocker |
The browser is hostile territory. Software at every level – from extensions to VPNs to router firmware – can tamper with your network traffic. Competitors and AI can analyze your source code. Now you have tools purpose-built to defend both layers.
For existing DataUnlocker customers, AfterPack is the natural next step – complete your protection stack. For new users, you can start with DataUnlocker or AfterPack – they complement each other perfectly.
Questions? Join our Telegram community at t.me/dataunlocker.
Your frontend's guardian, DataUnlocker