Keploy is an open-source testing platform that automatically generates test cases and mocks from real API traffic, solving one of the most persistent problems in the development lifecycle: testing at scale without slowing down development.
Know what problem keploy solves.
The Testing Dilemma: Time vs. Quality
Automated testing is critical for preventing bugs, maintaining code quality, and enabling continuous integration. But writing and maintaining test cases, especially for APIs, involves several challenges:
- Manually writing test cases for every endpoint is tedious.
- Developers often skip tests under deadline pressure.
- Mocking dependencies like databases, caches, or third-party APIs takes time.
- Test flakiness due to unstable services leads to broken CI/CD pipelines.
- QA teams struggle to keep up with rapidly changing codebases.
All these issues contribute to low test coverage, delayed releases, and buggy software in production. Even with popular tools like Postman, JUnit, or Mockito, testing APIs is still far from effortless.
How Keploy Solves the Problem
Keploy tackles the testing bottleneck by automatically turning API calls into test cases and mocks, directly from your local development or staging environments. Here's how it solves the major pain points:
1. No More Manual Test Writing
Keploy captures real-time API traffic—including requests, responses, headers, status codes, and payloads—and transforms them into executable test cases. This eliminates the need to manually write dozens or hundreds of test cases.
2. Auto-Generated Mocks of Dependencies
Most tests fail because they depend on external services or stateful databases. Keploy solves this by recording and replaying dependency calls, generating mocks for databases, HTTP services, and more. This makes tests deterministic and reliable, even without internet or backend services.
3. Test from Real User Behavior
Unlike traditional tests that require hardcoded inputs, Keploy generates tests from actual user traffic. This ensures better real-world coverage and catches bugs that synthetic test cases might miss.
4. Simplifies Regression Testing
Once tests are recorded, they can be reused automatically whenever new code is pushed. This makes regression testing easy, consistent, and almost maintenance-free.
5. Reduces Test Flakiness
By isolating tests from external dependencies through mocks, Keploy dramatically reduces flaky test results. Your CI/CD pipeline becomes more stable, and you avoid wasting time debugging failed builds.
6. Empowers Developers to Test Locally
Keploy runs in local environments, letting developers test their APIs without switching context or relying on a QA team. This brings testing “left” into the development process, which leads to faster bug detection and fewer issues in production.
Who Should Use Keploy?
Keploy is built for backend developers, QA engineers, and DevOps teams who are:
- Tired of writing repetitive tests manually.
- Dealing with unstable mocks or hard-to-maintain stubs.
- Looking to automate regression testing without adding overhead.
- Wanting to test APIs without depending on external services or live databases.
- Working in microservices architecture where dependencies are complex.
Whether you're a solo developer or part of a large engineering team, Keploy can streamline your workflow by automating the boring parts of testing.
Example: Testing a Payments API
Imagine you're building a payments API that interacts with a database, a third-party payment gateway (like Stripe), and a logging service. In traditional setups, testing this API would require:
- Writing test cases for every scenario.
- Creating mock data for the database.
- Mocking the external Stripe service.
- Ensuring logs don’t interfere with outputs.
With Keploy, you can simply run the API once in your development environment. Keploy captures the traffic and automatically creates:
- A test case with all inputs and expected outputs.
- A mock for the Stripe API call.
- A snapshot of the database query and its result.
You now have a reliable, replayable test that doesn't break when Stripe is down or the DB changes.
Keploy in CI/CD Pipelines
Keploy integrates seamlessly into CI/CD tools like GitHub Actions, GitLab CI, Jenkins, and more. Once test cases and mocks are created, they can be committed to version control and executed as part of every pull request or release cycle—ensuring that nothing breaks in production.
Conclusion: Why Keploy Matters
In a world where speed and reliability are critical, testing can no longer be an afterthought. But manual testing doesn’t scale, and traditional methods often create more complexity than they solve.
Keploy offers a smarter, faster way to test APIs by:
- Automating test and mock generation,
- Reducing developer toil,
- Catching real-world bugs early, and
- Empowering teams to shift-left without friction.
By solving the problem of test automation without manual effort, Keploy helps developers ship quality code faster—with confidence.