Keploy: Automating Test Generation from Real Traffic

What is Keploy?

Keploy is an open-source, AI-powered testing platform designed to relieve developers and QA engineers from the tedious task of writing manual test scripts. By integrating directly into the application runtime, Keploy captures real user API traffic and intelligently converts it into high-quality test cases, complete with mocks and assertions.

It is particularly valuable for teams managing microservices or complex monoliths, as it turns actual production behavior into a safety net against regression bugs. Whether you are working with Go, Java, Node.js, or Python, Keploy ensures that your testing coverage reflects real-world usage rather than hypothetical scenarios.

Key Features

Traffic-to-Test Conversion: Automatically turns captured API calls into test cases. This "Record and Replay" methodology ensures that tests represent exactly how users interact with the application.
Automated Mocks & Stubs: The AI automatically generates mocks for external dependencies (like databases or third-party APIs), allowing developers to run tests in isolation without spinning up complex infrastructure.
Flakiness Detection: Keploy validates test consistency by checking for non-determinism, ensuring that only stable and reliable tests are committed to the codebase.
CI/CD Integration: Designed to fit seamlessly into existing pipelines (Jenkins, GitHub Actions, etc.), it enables continuous regression testing with every code push.
Multi-Language Support: Native support for popular backend languages including Go, Java, Node.js, and Python.

How to Use Keploy

Integrate the Agent: Install the Keploy SDK or agent into your application environment.
Record Traffic: Run your application as usual. Keploy will intercept API calls and record the request/response pairs along with downstream dependencies.
Generate Tests: The system converts these recordings into executable test files.
Replay & Validate: Run the generated tests. Keploy replays the traffic against the application, comparing the new responses with the recorded "golden" usage to detect any regressions or bugs.

Pricing

Open Source (Free): The core platform is open-source and free to use for individual developers and teams who want to host it themselves.
Enterprise/Cloud: Keploy also offers paid tiers (e.g., Team and Scale plans) which include advanced features like centralized management dashboards, role-based access control (RBAC), and dedicated support.

Use Cases

Regression Testing: Automatically verify that new code changes haven't broken existing functionality by replaying past traffic.
Legacy Code Coverage: Quickly build a test suite for older applications that lack documentation or existing tests.
Microservices Validation: Test interactions between different services without manually mocking every endpoint.