Keploy

Keploy is an AI-powered testing platform that fundamentally changes how developers ensure software quality. It's designed for modern engineering teams, especially those working with microservices and complex distributed systems, who are frustrated by the slow, manual, and often brittle process of writing and maintaining tests. Keploy's core magic lies in its ability to automatically generate accurate, reliable test cases and mocks by recording real user traffic and application behavior. Using eBPF technology, it observes API calls in real-time, capturing both the request and the response, along with all network interactions with dependencies like databases, internal services, or third-party APIs. This recorded data is then transformed into executable unit, integration, and API tests, complete with stubs for all external dependencies. The result is a dramatic acceleration in achieving comprehensive test coverage—up to 90% in minutes instead of weeks. It supports popular languages like Go, Java, Node.js, and Python, and integrates seamlessly into your existing development workflow and CI/CD pipelines. With Keploy, developers can shift testing left with confidence, catch regressions early, and significantly boost development velocity without compromising on code reliability.

AI-Powered Test & Mock Generation

Keploy uses advanced AI to automatically create stable, deterministic test cases and mocks by analyzing real API traffic. Instead of you writing countless lines of test code, it intelligently records live application behavior and transforms it into a comprehensive test suite. This includes generating precise stubs for databases, external services, and other dependencies, ensuring your tests run in a perfectly isolated sandbox every time.

Record and Replay API Traffic

This is Keploy's foundational feature. Using eBPF, it non-intrusively records all API calls and network interactions made by your application during normal operation or specific testing sessions. You can then replay these recordings as automated tests in your CI/CD pipeline. This ensures your tests are based on real-world usage patterns and data, making them far more relevant and reliable than manually scripted scenarios.

Coverage and Performance Reporting

Keploy doesn't just create tests; it gives you clear visibility into their effectiveness. It provides detailed coverage reports, showing exactly which parts of your codebase are exercised by your tests. Furthermore, it offers performance testing capabilities by analyzing the recorded traffic, helping you identify potential bottlenecks and ensure your application meets performance standards from the very beginning.

Seamless CI/CD and Developer Tool Integration

Built for developer workflow efficiency, Keploy integrates directly into your existing tools. It works natively with popular CI/CD platforms, automatically running the generated test suite on every pull request or build. For developers, there's also a dedicated VS Code extension, allowing you to generate, manage, and run tests directly from your IDE, making test creation a natural part of the coding process.

Accelerating Legacy Application Testing

Modernizing or adding tests to a large, untested legacy codebase is a daunting task. Keploy can be attached to the running application to record its real traffic. Within minutes, it generates a full suite of integration and API tests that reflect how the application is actually used, providing immediate test coverage and a safety net for future refactoring or feature development.

Ensuring Reliability in Microservices Architectures

Testing microservices is complex due to numerous interdependent services. Keploy simplifies this by recording interactions between services during development or staging deployments. It automatically creates mocks for each service, allowing teams to test their service in complete isolation with realistic data, catching integration bugs early without needing all dependencies running.

Rapid Prototyping and Development

When building a new feature or service, developers can use Keploy from day one. As they manually test their API endpoints via a browser or curl, Keploy records those sessions. It instantly generates the corresponding test cases, allowing the developer to build a robust regression suite in parallel with writing the actual feature code, ensuring quality keeps pace with velocity.

Maintaining Test Quality During Refactoring

When refactoring code for performance or clarity, a major concern is accidentally breaking existing functionality. With Keploy, the test suite is derived from real user behavior. This means you can refactor with confidence, knowing that the tests will accurately validate that the core user-facing workflows still perform exactly as they did before the changes.

How is Keploy different from other AI testing tools?

Unlike tools that are simply wrappers around large language models (LLMs) which can generate hypothetical tests, Keploy is behavior-driven. It uses eBPF to record actual API calls and network activity from your running application. This results in tests that are accurate, reliable, and based on real-world usage, not guesses. It generates both the test cases and the necessary mocks/stubs automatically.

What programming languages and frameworks does Keploy support?

Keploy currently offers robust support for several popular languages including Go, Java (Spring Boot), Node.js, and Python. It is designed to work with standard frameworks and HTTP servers within these ecosystems. The team is actively working on expanding support to more languages, and you can check their official documentation for the most up-to-date list.

Can I use Keploy in my CI/CD pipeline?

Absolutely! Keploy is built for modern DevOps practices. The tests and mocks it generates are standard, portable artifacts (like Go tests or JUnit-style tests). These can be easily integrated into any CI/CD system such as GitHub Actions, GitLab CI, Jenkins, or CircleCI. You can configure your pipeline to run the Keploy test suite automatically on every commit or pull request.

Is Keploy an open-source tool?

Yes, Keploy has a strong open-source foundation. Its core engine is available on GitHub, where it has garnered significant community support with over 15.6k stars. This allows developers to self-host, inspect the code, and contribute. Keploy Inc. also offers enterprise-grade cloud solutions with additional features, support, and managed services for teams needing a fully hosted solution.