Modern Load Testing with JavaScript
Write load tests in JavaScript — the language your team already knows.
k6 uses a developer-friendly scripting approach. No XML configuration files, no complex GUI — just clean JavaScript code that lives in your repo alongside your application.
Scale to Thousands of Virtual Users Instantly
LoadFocus runs your k6 scripts on cloud infrastructure with up to 20,000+ concurrent virtual users. No need to provision servers or manage test agents.
Built for Modern Development Workflows
k6 scripts integrate naturally with CI/CD pipelines, version control, and code review workflows. Test performance as part of your deployment process, not as an afterthought.
Why k6 Over Other Load Testing Tools?
Developer-first design with JavaScript scripting
Unlike JMeter's XML-based configuration or Gatling's Scala DSL, k6 uses plain JavaScript. If your team writes JavaScript, they can write load tests — no new language to learn.
Lightweight and blazing fast
k6 is written in Go and uses minimal resources per virtual user. A single LoadFocus cloud instance can simulate thousands of users without the memory overhead of Java-based tools.
Built-in assertions and thresholds
Define pass/fail criteria directly in your script with check() and thresholds. Tests automatically fail if response times exceed your SLA targets — perfect for CI/CD gates.
Real-Time Results with AI-Powered Analysis
Watch your test results stream in real-time as virtual users hit your application.
LoadFocus displays response times, error rates, throughput, and concurrent user metrics in live interactive charts — the same view you get with JMeter and general load tests.
AI That Explains Your Results
When your test completes, generate an AI analysis that identifies bottlenecks, explains performance patterns, and recommends specific optimizations for your tech stack.
Compare Results Across Runs
Track performance over time. Compare results between releases to catch regressions early. Baseline comparison shows exactly what changed and why.
Enterprise-Ready k6 Cloud Testing
Looking for scalable, team-friendly performance testing?
LoadFocus enhances k6 with cloud scalability, team collaboration, historical results storage, and AI-powered insights — everything you need that k6 CLI alone doesn't provide.
Team Collaboration and Shared Results
Share test configurations and results across your team. Role-based access, shared dashboards, and Slack/webhook integrations keep everyone aligned on performance goals.
No Infrastructure to Manage
Stop spinning up EC2 instances or managing Kubernetes clusters for load testing. LoadFocus handles all cloud infrastructure — you just upload your script and click run.
Test from 25+ Global Locations
Simulate users from multiple regions simultaneously.
LoadFocus runs your k6 tests from 25+ AWS regions worldwide. Distribute load across locations to simulate realistic global traffic patterns.
Configurable Load Distribution
Set custom percentages per region — 50% US East, 30% EU West, 20% Asia Pacific. Understand how geography affects your application performance.
Region-Specific Performance Insights
See response times broken down by test location. Identify regions where your CDN, database replicas, or API gateways need optimization.
1
Upload Your Script
Upload your k6 JavaScript test script (.js file). Don't have one? Use our starter template to get started in seconds.
2
Configure Your Test
Set virtual users, duration, and choose from 25+ cloud locations. Optionally distribute load across multiple regions.
3
Run in the Cloud
LoadFocus spins up cloud instances, runs your k6 script at scale, and streams results back in real-time. No infrastructure to manage.
4
Analyze with AI
Review live results, then generate an AI-powered analysis that explains bottlenecks and recommends optimizations for your specific tech stack.
k6 Script Validation
Catch Issues Before Running Your Test
LoadFocus validates your k6 script before execution — checking for entry point functions, module imports, and common syntax errors.
Validates export default function entry point
Checks k6 module imports (k6/http, k6/check, etc.)
Warns about missing check() assertions for better result analysis
Multi-Location k6 Load Testing
Simulate Global Traffic Patterns
Run your k6 tests from multiple AWS regions simultaneously to understand how users experience your application from different parts of the world.
How It Works:
Select multiple test locations from 25+ AWS regions
Set load distribution percentages per region (must total 100%)
Each region runs its share of virtual users independently
Benefits:
Realistic global traffic simulation
Identify geographic performance bottlenecks
Test CDN and edge caching effectiveness
Validate database replica performance across regions
Seamless CI/CD and Team Integrations
Integrate k6 Results Into Your Workflow
Connect LoadFocus with your existing tools to make performance testing part of your development pipeline.
Slack notifications with test summaries and AI insights
Webhook integration for custom automation workflows
API access for CI/CD pipeline integration (Jenkins, GitHub Actions, GitLab CI)
Scheduled tests with automated regression detection
Real-Time k6 Test Configuration
Full Control Over Your Test Execution
Configure every aspect of your k6 test run from the LoadFocus dashboard — no command-line flags to remember.
Features:
Visual VU and duration sliders with plan limit indicators
Environment variable injection (--env KEY=VALUE) for parameterized tests
Data file upload (CSV, JSON) for dynamic test data
Ramp-up configuration for gradual load increase
Benefits:
Override script options from the UI — no script edits needed for different test scenarios
Save test configurations as presets for quick re-runs
View real-time logs and k6 console output during execution
Download test results and share reports with your team
Who Benefits from k6 Cloud Load Testing?
Backend Developers — Test API endpoints with the JavaScript you already know.
Frontend Engineers — Validate that your SPA handles concurrent users without degradation.
DevOps Engineers — Integrate performance gates into CI/CD pipelines.
SRE Teams — Establish performance baselines and catch regressions before production.
QA Engineers — Write maintainable, version-controlled performance test suites.
Platform Teams — Validate infrastructure changes under realistic load conditions.
Startups — Enterprise-grade load testing without enterprise costs or complexity.
Agencies — Test client applications from multiple global locations with shared team access.
Enterprise — Scalable, secure cloud testing with team collaboration and audit trails.
Advanced k6 Features on LoadFocus
Thresholds — Define pass/fail criteria in your script. Tests automatically fail if SLA targets are exceeded.
Checks — Built-in assertions validate response status, body content, and timing for every request.
Custom Metrics — Track business-specific metrics alongside standard HTTP performance data.
Scenarios & Executors — Use k6 scenarios for complex traffic patterns (ramping VUs, constant arrival rate, etc.).
k6 in the Cloud — LoadFocus vs k6 Cloud, k6 OSS, BlazeMeter, Artillery
If you're already writing k6 scripts in JavaScript, the question is where to run them. Five popular k6-compatible platforms compared on the things that matter when you ship.
| Capability | LoadFocus | k6 Cloud | k6 OSS (self-host) | BlazeMeter | Artillery |
|---|---|---|---|---|---|
| Run existing .js scripts unmodified | Yes — drag-and-drop | Yes (native) | Native | Yes (k6 import) | Different DSL (YAML) |
| Distributed cloud execution (no infra) | Yes — fully managed | Yes | Self-managed (Kubernetes) | Yes | Artillery Cloud |
| Cloud test locations | 26+ AWS regions | ~20 regions | Self-managed | 56+ regions | AWS Lambda regions |
| AI-powered bottleneck analysis | Yes — explains slow endpoints | No | No | No | No |
| Free tier with cloud execution | Yes — 25 VUs / 60 s | Limited trial | Free OSS (self-host) | Limited (10 users) | Free OSS (self-host) |
| Mix .jmx + k6 scripts in one platform | Yes — both run side-by-side | k6 only | k6 only | Yes | No |
The k6 Metrics That Tell You Whether to Ship
k6 outputs dozens of metrics by default. These four are the ones that decide whether your release is green-lit — or whether you roll back.
http_req_duration (p95)
Time from request start to response complete, 95th percentile. Set this as a k6 threshold (e.g. p(95) < 500) so the test FAILS automatically when latency drifts. Better than a chart you forget to read.
http_req_waiting (TTFB)
Time waiting for the server's first byte after the request hits. Isolates origin processing time from network transfer. Spikes here are server problems; spikes in http_req_receiving are network problems.
http_req_failed rate
Fraction of HTTP requests that returned 4xx/5xx or timed out. Pair with k6 thresholds (e.g. rate < 0.01) so the test fails on >1% errors. Cross-check with API monitoring after launch — load tests find the ceiling, monitoring catches drift.
iterations / iteration_duration
How many full test scenarios completed and how long each took. iterations × VUs gives effective throughput. iteration_duration drift means the user journey is degrading even when individual requests look fine.
What is k6 and how is it different from JMeter?
k6 is an open-source load testing tool by Grafana Labs that uses JavaScript for test scripts. Unlike JMeter which uses XML configuration files and a Java-based GUI, k6 is developer-friendly — you write tests in the same language as your application. k6 is also more memory-efficient, using Go under the hood to simulate thousands of virtual users with minimal resources.
Do I need to install k6 to use LoadFocus?
No. LoadFocus runs k6 in the cloud for you. Just upload your .js test script (or use our starter template), configure virtual users and duration, and click Run. LoadFocus handles all infrastructure — spinning up cloud instances, running k6, collecting results, and shutting down when done.
Can I use my existing k6 scripts?
Yes. Upload any standard k6 script (.js file) that uses export default function as the entry point. LoadFocus supports all k6 modules (k6/http, k6/check, k6/metrics, etc.), custom thresholds, scenarios, and data file imports (CSV, JSON).
How does AI analysis work with k6 tests?
After your k6 test completes, click 'Generate AI Analysis' on the results page. The AI examines your response times, error rates, throughput patterns, and check results — then provides a detailed analysis with bottleneck identification and optimization recommendations tailored to your tech stack.
What k6 features are supported?
LoadFocus supports all standard k6 features: HTTP/HTTPS requests, WebSocket connections, checks and thresholds, custom metrics, scenarios with multiple executors (ramping-vus, constant-arrival-rate, etc.), environment variables, data file parameterization, and tags/groups for result organization.
How many virtual users can I run?
Depending on your plan, you can run up to 20,000+ concurrent virtual users. k6 is very memory-efficient — a single cloud instance can handle thousands of VUs. For higher loads, LoadFocus automatically distributes across multiple cloud instances.
Can I run k6 tests from multiple locations?
Yes. LoadFocus supports 25+ AWS regions worldwide. You can distribute your load across multiple locations with custom percentages — for example, 50% from US East, 30% from EU West, and 20% from Asia Pacific — to simulate realistic global traffic.
How does pricing work for k6 tests?
k6 tests are included in all LoadFocus load testing plans at no extra cost. Your plan determines the VU limit, test duration, and number of tests per month. AI analysis credits are shared across all test types (general, JMeter, and k6).
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