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Documentation

Complete documentation for Zest cookie consent toolkit

Overview

Zest is a lightweight, zero-dependency cookie consent toolkit designed for GDPR and CCPA compliance. It provides intelligent script blocking, cookie interception, and a beautiful customizable UI — or a headless engine if you want to bring your own UI.

Why Zest?

Feature Zest Klaro Tarteaucitron
Size (gzipped, full) ~16KB (12 langs) / ~10KB (1 lang) ~45KB ~80KB
Size (gzipped, headless) ~11KB — —
Dependencies None None None
Script Blocking Yes Yes Yes
Cookie Interception Yes No No
Storage Interception Yes No No
DNT/GPC Support Yes Partial No
Shadow DOM Yes No No
Headless entry (BYO UI) Yes No No

Core Features

  • Two entry points - Full build with Shadow DOM UI, or headless for bring-your-own-UI consumers
  • Intelligent Script Blocking - Multiple blocking modes (manual, safe, strict, doomsday) with automatic detection of known trackers
  • Cookie & Storage Interception - Intercepts document.cookie, localStorage, and sessionStorage operations
  • Privacy Controls - Respects Do Not Track (DNT) and Global Privacy Control (GPC) browser signals
  • Multi-Language - 12 built-in languages with auto-detection (full build only)
  • Customizable UI - Banner, settings modal, and floating widget with theming support
  • Event System - DOM events, Zest.on() / Zest.once() subscribers, and config callbacks
  • Defense-in-depth security - XSS / ReDoS / clickjacking / prototype-pollution mitigations on every config input

Getting Started

  1. Installation & Quick Start - Add Zest to your website
  2. Configuration - Customize behavior and appearance
  3. API Reference - Programmatic control
  4. Script Blocking - How script blocking works
  5. Events & Callbacks - React to consent changes
  6. Styling - Customize the look and feel

Need Help?