Ruse

Mock APIs in Chrome. No server. No setup. No BS.

Mock APIs directly in Chrome. No mock server, proxy, Docker setup, or code changes required. Ruse is a local-first API mocking tool for frontend developers, QA engineers, and teams building web apps against APIs that are incomplete, unstable, or hard to reproduce. Create a rule in the Chrome side panel, choose the request you want to intercept, define the response, and keep building. Your app receives the mock response instantly, right in the browser. What Ruse helps you do: - Mock HTTP requests from fetch() and XMLHttpRequest - Create rules for GraphQL operations - Intercept WebSocket flows - Match URLs by wildcard, exact URL, or regex - Match by HTTP method and request body - Return custom status codes, headers, JSON, raw text, or multipart responses - Add artificial delays to simulate slow APIs and edge cases - Toggle rules on and off without touching your app - View a live request log from the selected tab - Turn captured requests into mock rule drafts - Keep mock data local in your browser Ruse is built for the everyday moments that slow product teams down: The backend is not ready yet. The staging API is flaky. You need to test a 500 error, timeout, empty list, or malformed response. You want to build the UI before the real endpoint exists. You need a predictable demo without depending on live infrastructure. Instead of spinning up a separate mock server or rewriting app code, Ruse lets you control API behavior from Chrome itself. Use it for: - Frontend development - UI state testing - QA and regression testing - API contract work - Demo preparation - Error state design - Offline development - Reproducing tricky network scenarios Ruse is local-first. Your mock rules and request logs stay in your browser for the current release, and local mocking does not require an account. Build against the API you need, not the API you are waiting for.