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ScriptsApr 12, 2026·2 min de lectura

k6 — Modern Load Testing Tool Using Go and JavaScript

k6 is a modern load testing tool built by Grafana Labs. Write test scripts in JavaScript, run them in a high-performance Go runtime. Developer-centric with CLI-first workflow, CI/CD integration, and Grafana Cloud for result analysis.

Introducción

k6 is a modern load testing tool built by Grafana Labs. Write test scripts in JavaScript (ES6), execute them in a high-performance Go runtime (not Node.js). CLI-first, developer-friendly, with built-in metrics, thresholds, and CI/CD integration.

What k6 Does

  • JavaScript scripting — ES6 modules for test logic
  • Go runtime — high performance, low overhead
  • Virtual Users — simulate concurrent users
  • Scenarios — constant, ramping, arrival-rate
  • Thresholds — pass/fail criteria for CI
  • Checks — response assertions
  • Metrics — request duration, throughput, errors
  • Protocols — HTTP, WebSocket, gRPC, Redis
  • Extensions — xk6 for custom protocols
  • Output — JSON, CSV, Grafana Cloud, Prometheus, InfluxDB

Comparison

Tool Scripts Runtime Distributed
k6 JavaScript Go k6-operator
Locust Python Python Built-in
JMeter XML/GUI Java Built-in
Gatling Scala JVM Paid
Artillery YAML/JS Node.js Paid

FAQ

Q: Why not Node.js? A: k6's JS engine is goja, embedded in Go (not V8/Node). This keeps per-VU overhead small, letting a single machine simulate thousands of VUs.

Q: Grafana integration? A: Output to Prometheus Remote Write or Grafana Cloud k6, then view real-time load-testing metrics in a Grafana dashboard.

Sources

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