Extensibility and Scripting

ZAP's extensibility represents one of its greatest strengths. The add-on marketplace offers dozens of extensions enhancing core functionality. Anyone can develop and share add-ons, creating a rich ecosystem. Built-in scripting support for multiple languages (JavaScript, Python, Ruby) enables custom automation without external tools. Scripts integrate deeply with ZAP's engine, accessing internal APIs for sophisticated automation.

Burp Suite's extension ecosystem, primarily through the BApp Store, provides high-quality extensions. However, many powerful extensions require Professional edition APIs unavailable in the Community version. Extension development uses Java or Python through the Burp Extender API. While powerful, the API learning curve is steeper than ZAP's scripting interfaces. The commercial model also means some excellent extensions require additional purchases.

Community contribution patterns differ significantly. ZAP's open-source nature encourages broad participation—bug fixes, features, and extensions come from diverse contributors. Burp Suite's community primarily creates extensions rather than core features. This difference means ZAP often adapts faster to new vulnerability types or testing requirements through community contributions, while Burp Suite maintains tighter control over core functionality.