What is Grafana k6? Grafana k6 (commonly just called k6) is an open-source, QA/SDET-friendly, and extensible load testing tool built by Grafana Labs. It lets you write performance test scripts in JavaScript or TypeScript and execute them against your APIs. It is designed for: QA Engineers and SDETs who need reliable, repeatable load scenarios Developers who want to write tests as code SREs who want to validate SLOs before and after deployments k6 is built in Go , which means the test runner itself is blazing fast and extremely memory-efficient — it can simulate thousands of virtual users on a single machine without breaking a sweat. Why k6 Over Other Tools? JMeter has been the industry default for years. But the ecosystem has moved on.…