Chrome Extension for instant interception.
HTTP Server for dynamic mocking.
Two tools, one ecosystem, unlimited possibilities.
Get started with Mockzilla in seconds - choose your preferred method
For hosted endpoints with advanced features
For real-time request interception in browser
Your server will be available at http://localhost:36666
A powerful Next.js application with PostgreSQL database that provides dynamic API mocking with advanced features like stateful workflows and AI integration.
Generate realistic data using JSON Schema and Faker. Simulate complex user flows with persistent state and logic between requests. Each scenario gets a transient database to push, update, and query items during a session.
Scenario-based data persistence
First-class support for AI agents to control your mocks
Complex stateful scenarios with transitions and conditions
Your mock server will be available at http://localhost:36666
A browser extension that intercepts fetch() and XMLHttpRequest calls in real-time, replacing responses instantly with your mock data.
The Chrome Extension patches fetch() and XMLHttpRequest in the page context to intercept requests and replace responses with your defined mock data. Perfect for situations where you're working with an existing application but need different responses from external APIs.
Intercepts page-level requests instantly
Substring or exact URL matching
Rules sync via Chrome storage
Comprehensive mocking capabilities across both tools
Intercepts fetch() and XMLHttpRequest calls in real-time as they happen on the page, replacing responses instantly with your mock data.
Choose between substring and exact URL matching to target specific API endpoints with precision.
Monitor per-tab hit counters and last matched URLs to verify your mocks are working correctly.
Support for both JSON and plain text response bodies with appropriate Content-Type headers.
Create complex user flows with persistent state and database between requests.
First-class support for AI agents to control your mock endpoints.
A comprehensive approach to API mocking
Select between HTTP Server for hosted endpoints or Extension for in-browser interception
Define URL patterns, response bodies, and HTTP methods for your mock endpoints
Integrate with your development workflow to mock APIs during testing
