hoverfly
A lightweight open-source API simulation tool for creating realistic mocks of dependent services during development and testing.
What is hoverfly?
Hoverfly is an open-source API simulation and service virtualization tool that allows developers and testers to create realistic mock versions of external APIs. It solves the problem of depending on slow, unreliable, or unavailable services during development and testing by providing lightweight, programmable simulations. This enables teams to work independently and test edge cases like network failures or latency.
Developers, QA engineers, and DevOps practitioners who need to isolate their applications from external API dependencies for faster development, reliable testing, and CI/CD pipelines.
Developers choose Hoverfly for its lightweight design, ease of use, and flexibility—it runs anywhere, supports extensibility in any language, and provides realistic simulations without requiring complex infrastructure. Its open-source nature and permissive Apache 2 license make it a cost-effective alternative to commercial service virtualization tools.
Overview
Lightweight service virtualization/ API simulation / API mocking tool for developers and testers
Use Cases
Best For
- Simulating third-party API dependencies during local development
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