SpectoLabs/hoverfly

Health v2 · maintenance only

Adoption not part of the score

2509 stars · 228 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Hoverfly is a lightweight open-source API simulation and service virtualization tool written in Go. It captures HTTP/HTTPS traffic and replays it as simulations, allowing developers and testers to replace real API dependencies with fast, controllable mocks.

Use cases

• mock external APIs during integration testing
• simulate slow or flaky third-party API dependencies
• simulate network latency, random failures, and rate limits
• capture real HTTP traffic and replay it as stubs
• run API mocks in CI pipelines instead of live sandboxes
• virtualize REST APIs that are not yet built

When to choose

• you need HTTP/HTTPS API mocking or service virtualization in tests
• your test suites are slowed by unavailable or unreliable downstream APIs
• you want to test edge cases like latency, failures, and rate limiting
• you prefer a lightweight, self-hosted alternative to commercial virtualization tools

When to avoid

• you need to virtualize non-HTTP protocols like databases or message queues
• you want a hosted, managed simulation platform (consider Hoverfly Cloud)
• you only need simple unit-test mocks in a single language where a library-level mock suffices

Facets

cli-tool · maturity active

testing mocking http-server proxy middleware testing developer-tools apis web-development cross-platform cli go api-simulation service-virtualization api-mocking stubbing mitm-proxy http-mocking test-doubles automation docker

Member repositories

For agents

markdown · JSON · MCP: product_card(name="SpectoLabs/hoverfly")