What is Keploy
Keploy is an open-source, AI-driven testing platform that automatically generates tests and mocks from real API traffic. It uses eBPF to intercept actual API traffic, replays it in CI to create deterministic regression tests, and automatically generates corresponding mocks and sandboxes similar to production environments, all with minimal modification to the original code. The core platform is licensed under Apache 2.0 and has accumulated over 17,000 stars and more than 1,000 contributors on GitHub, making the OSS core permanently free to self-host.
Key Features and Use Cases
Keploy supports any language and framework, including Go, Java, Python, Node.js, Rust, PHP, and Ruby, making it particularly useful in multi-language mixed backend environments. For teams struggling with insufficient test coverage and not wanting to spend a lot of time writing tests manually, Keploy can convert daily real requests into repeatable test assets. Common use cases include quickly supplementing existing API regression tests, automatically generating external dependency mocks to isolate test environments, replaying traffic in CI to verify consistent behavior, and building test sandboxes similar to production environments. For teams looking to improve API test maturity with minimal modification cost, Keploy's open-source nature and zero-invasion approach are very attractive.
Key Features
- Intercept real traffic with eBPF and replay as regression tests
- Automatically generate external dependency mocks and test sandboxes
- Almost zero code modification required for integration
- Supports multiple languages and frameworks
- OSS core licensed under Apache 2.0 for permanent free self-hosting
Pros
- Converts real traffic into tests, reducing manual test writing
- Zero-invasion approach results in low introduction cost
- Open-source core is free and has an active community
Cons
- Advanced features like AI test generation require paid plans
- eBPF interception can be complex to set up in some environments
- Recording traffic requires careful handling of sensitive data
Use Cases
- Supplement existing API regression tests quickly
- Automatically generate mocks to isolate external dependencies
- Replay traffic in CI to verify consistent behavior
- Build test sandboxes similar to production environments
Editor's Note
Editor's note: Keploy's approach to automating API testing with real traffic is very clever, especially useful for backend teams with long-term low test coverage. Remember to plan for anonymizing sensitive data in traffic before introducing Keploy.
FAQ
Does Keploy require modifying my code?
Almost not at all. It uses eBPF to intercept real traffic at the system level and replay it, which is a nearly zero-invasion approach.
Can I use Keploy's open-source version for free?
Yes. The OSS core is licensed under Apache 2.0 and can be self-hosted permanently for free. Paid plans provide AI test generation and enterprise-level support.