network-mock-server

What problem does it solve?

Intercept and mock API responses during automated tests to create deterministic, offline-capable test runs.

Core Features & Use Cases

• Record baseline API responses from a real run to establish a stable reference.
• Replay those responses deterministically across navigations.
• Modify response fields, add latency, and simulate errors per endpoint.
• Persist mocks across page navigations using Playwright's page.route and optional CDP Fetch domain.

Quick Start

Record baseline API responses for your target page, then configure deterministic mocks to replay, modify, and simulate latency or errors across navigations.