Performance testing with OpenAPI Spec and k6

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Performance testing is often overlooked in API development, not because it isn’t important, but because keeping tests up to date as APIs evolve is a challenge. Many teams maintain OpenAPI specs for documentation, but writing and maintaining k6 performance tests manually can be tedious and error-prone.

To bridge this gap, we built openapi-to-k6, a CLI tool that converts OpenAPI specs into TypeScript clients, making it easy to generate and execute k6 performance tests. With this approach, developers can:

  • Leverage TypeScript for Strong Typing & Autocompletion – making test scripts more maintainable and easier to work with.
  • Automatically Generate API Clients – eliminating the need to manually write test logic for every API change.
  • Ensure Performance Tests Stay Up to Date – as APIs evolve, test scripts can be regenerated with minimal effort.

    • In this session, we’ll walk through how openapi-to-k6 works, share the real-world challenges we faced while building it, and demonstrate how JavaScript/TypeScript developers can integrate it into their workflows. Whether you're a backend engineer, tester, or DevOps professional, this talk will show you how to harness OpenAPI and TypeScript for automated, scalable performance testing.

    Grafana & Friends Meetup, London, UK

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