~/utility/load-tester
Global API Load Tester — 10K+ RPS Stress Test
High-performance load testing tool simulating 10,000+ requests per second with geo-distributed traffic, weighted targets, and interactive HTML reports.
testing
>99% success
GoVegeta
Global
categoryutility / testing
languageGo
stackGo, Vegeta
marketsGlobal
success>99%
outputclean, RAG-ready JSON
key features
Extreme performance — 10,000+ requests per second
Geo-distributed testing from US, EU, and Asia
Weighted multi-target attacks (e.g., 90% reads / 10% writes)
Residential proxy support for realistic traffic
Constant-rate pacing to prevent Coordinated Omission
Interactive HTML reports via Vegeta Plots
Detailed latency, throughput, and error metrics
use cases
- API performance benchmarking before launch
- Capacity planning and infrastructure sizing
- Finding breaking points and bottlenecks
- Testing CDN and load balancer configurations
- Geo-distributed latency testing
- Regression testing for performance-critical endpoints
input parameters
| Parameter | Type | Required | Description |
|---|---|---|---|
targets | array | required | Target endpoints with URL, method, body, headers, and weight |
rate | number | optional | Requests per second (default: 50) |
duration | number | optional | Test duration in seconds (default: 60) |
geoDistribution | array | optional | Regions with country codes and traffic weights |
useStickySessions | boolean | optional | Maintain session affinity (default: true) |
maxCostLimit | number | optional | Cost ceiling for the test run |
Output Example
The load tester generates interactive HTML reports and structured metrics:
1{
2 "summary": {
3 "totalRequests": 50000,
4 "duration": "60s",
5 "rps": 833.33,
6 "successRate": 99.8,
7 "latency": {
8 "mean": "12.4ms",
9 "p50": "10.1ms",
10 "p95": "28.7ms",
11 "p99": "89.2ms",
12 "max": "342.1ms"
13 },
14 "statusCodes": {
15 "200": 49900,
16 "503": 100
17 }
18 }
19}
faq
How does geo-distributed testing work?
You specify country codes and traffic weights. The tool distributes requests across Apify proxy servers in those regions, simulating realistic global traffic patterns.
What is Coordinated Omission?
It's a common load testing pitfall where the tool slows down when the target is overloaded, making results look better than reality. Vegeta uses constant-rate pacing to avoid this.
Can I test authenticated endpoints?
Yes, include authorization headers in the target configuration. Each target can have its own headers, method, and body.
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