| Transform | Description |
|---|---|
| Domain Lock | Allows binding the code to a specific domain (or its subdomains). When the code running in the browser originates from a non-matching domain, it breaks with an error. |
| Boolean Literals | Transforms the false and true literals to other expressions that result in the same false and true values, respectively. |
| Integer Literals | Transforms integer literals to other (less obvious) expressions that result in the same value when evaluated. It can also transform all integer literals to a specific radix (binary, decimal, hexadecimal, or octal). |
| Property Indirection | Transforms direct property access to indirect property access. |
| String Literals | Extracts string literals into variables and initializes those variables from encoded string literals. Replaces the original string with the corresponding variables. |
| Local Declaration | Mangles the names of local declarations. |
| Debugger Removal | Removes information from production code that can help hackers inspect your code. |
| Control Flow Protection | Obfuscates the program’s control flow by adding opaque predicates or dead code and flattening the control flow. |
| Function Reordering | Moves functions from their original locations to a new one in the same lexical scope. When the *randomize* option is turned on, it sets the new location randomly. |
| Tamper Detection | Wraps critical code with guarding functions, which check at runtime for modifications. Tampered code will not run correctly. |
| Date Lock | Injects code into the protected source, which tests if the current date is in a particular interval. If so, the code runs normally; otherwise, it can either exit or run a custom script. |
| Expression Sequence Obfuscation | Collects adjacent expression statements in the code and joins them into an expression sequence that is harder to understand. |
| Property Sparsing | Transforms object literal expression assignments into multiple assignment statements to make them harder to read. |
| Variable Grouping Protection | Separates variable declarations and initializations; it moves the declaration part to the end of the declaration scope. |
JavaScript code is inherently readable in the browser. Without protection, anyone can inspect, copy, or modify your application’s logic. Obfuscation helps conceal your intellectual property, sensitive logic, and API usage from unauthorized access or reverse engineering.
JavaScript is exposed by default in the browser. Without protection, your business logic, IP, and security measures are vulnerable to:
JSDefender protects your JavaScript by making it unreadable while preserving functionality for browsers.
Obfuscation makes your code significantly harder to understand and manipulate. It protects IP, deters attackers, reduces the risk of misuse, and can help organizations meet secure development and compliance standards. It’s an essential layer of client-side security.
In theory, yes. But in practice, high-quality obfuscation makes reverse engineering extremely difficult and time-consuming. PreEmptive’s advanced protection techniques are designed to increase the cost and complexity of such efforts beyond what’s practical for most attackers.
No. JSDefender is designed to preserve all functional behavior while transforming how the code appears. It’s still important to test the obfuscated output in a staging environment to confirm everything runs as expected.
Yes, but obfuscating readable source code first, then minifying afterward, usually yields better protection. Minification compresses code, but doesn’t conceal logic the way obfuscation does.
While other online obfuscators provide basic functionality, PreEmptive offers:
