Grafana K6

Modern load testing tool for engineering teams that lets you script performance tests in JavaScript and run them locally, in Kubernetes, or in the cloud with the same script. Designed to break the QA silo by enabling developers, SREs, and test engineers to run tests early and continuously as part of their workflow.

Backed by Grafana Labs and widely adopted across enterprises. Unlike traditional tools such as JMeter or Gatling that lean on XML or Scala, k6 uses JavaScript for test scripts, making it familiar to frontend and backend engineers. The same script runs identically whether executed on a laptop, a cluster, or a managed cloud service.

Key features:

• JavaScript-based scripts with support for gRPC, WebSocket, GraphQL, and REST APIs
• Threshold configuration to pass or fail CI/CD builds automatically
• Extensible via xk6 custom binaries for Kafka, OpenTelemetry, Prometheus, Kubernetes, and more
• Integrations with Grafana, Datadog, New Relic, and Postman for metrics and workflows
• Multiple test types: load, stress, spike, soak, and smoke testing from a single tool
• Hybrid browser and API testing for end-to-end scenarios with real frontend metrics

Load testing APIs before releases, validating SLOs and SLA targets, running regression tests in CI to catch performance degradations, and fault injection in Kubernetes to test resilience patterns. Teams use k6 to shift left on performance, provision infrastructure based on real capacity data, and continuously verify production via synthetic monitoring workflows.