REST QA Tool

A high-performance command-line tool for testing REST API endpoints with latency analysis, uptime monitoring, and rate limit detection.

Features

Core Tests

• Latency Test: Measures average, median, and 90th percentile response times
• Uptime Test: Tracks success rates and error breakdowns
• Rate Limit Detection: Uses binary search to find maximum sustainable RPS

Key Capabilities

• Configurable Parameters: Adjust request counts, timeouts, and rate limits
• Structured Logging: Built with zerolog for professional log management
• Query Parameter Support: Test endpoints with complex query strings
• Content Agnostic: Works with any HTTP endpoint (JSON, XML, HTML, etc.)
• Extensible Architecture: Modular design for easy addition of new tests

Installation

git clone https://github.com/bryanlabs/rest-performance-analyzer
cd rest-performance-analyzer
go build -o rest-performance-analyzer .

Usage

Basic Usage

# Test Coinbase API with default settings (100 requests)
./rest-performance-analyzer "https://api.coinbase.com/v2/prices/BTC-USD/spot"

# Test with query parameters
./rest-performance-analyzer "https://api.kraken.com/0/public/Ticker" --pair=XXBTZUSD

Individual Tests

# Run only latency test
./rest-performance-analyzer --test=latency --requests=5 "https://httpbin.org/delay/1"

# Run only uptime test
./rest-performance-analyzer --test=uptime --requests=5 "https://jsonplaceholder.typicode.com/posts/1"

# Run only rate limit detection
./rest-performance-analyzer --test=ratelimit --rate-low=1 --rate-high=3 --rate-duration=2 "https://api.coinbase.com/v2/prices/BTC-USD/spot"

# Run all tests
./rest-performance-analyzer --test=all --requests=5 --rate-low=1 --rate-high=2 --rate-duration=2 "https://httpbin.org/json"

Configuration Options

# Custom request count and timeout
./rest-performance-analyzer --requests=10 --timeout=30 "https://api.github.com/zen"

# Rate limit testing with custom range
./rest-performance-analyzer --test=ratelimit --rate-low=5 --rate-high=10 --rate-duration=2 "https://api.coinbase.com/v2/prices/ETH-USD/spot"

# Debug logging to see HTTP responses
./rest-performance-analyzer --log-level=debug --requests=3 "https://httpbin.org/json"

Configuration Files

# Use configuration file for complex setups
./rest-performance-analyzer --config config.yaml

# Override config file settings with CLI flags
./rest-performance-analyzer --config config.yaml --test=uptime --requests=5 --log-level=debug

# Rate limit testing with custom parameters
./rest-performance-analyzer --config config.yaml --test=ratelimit --rate-high=3 --rate-duration=2 --log-level=debug

# Fast CI testing with config file and CLI overrides
./rest-performance-analyzer --config config.yaml --requests=10 --timeout=5 --log-level=warn

Configuration Parameters

General Options

Flag	Default	Description
--config		Path to YAML configuration file
--requests	100	Number of requests for latency/uptime tests
--timeout	10	Request timeout in seconds
--test	basic	Test type: basic, all, latency, uptime, ratelimit
--log-level	info	Log level: debug, info, warn, error

Rate Limit Testing

Flag	Default	Description
--rate-low	1	Minimum RPS for binary search
--rate-high	10	Maximum RPS for binary search
--rate-duration	3	Duration for each RPS test (seconds)
--rate-sleep	1	Sleep between rate limit tests (seconds)

Example Outputs

Latency Test Results

✅ Latency Test:
  Average Latency: 34.41ms
  Median Latency: 31.47ms
  90th Percentile: 38.93ms
  Success Rate: 100.0%

Rate Limit Detection

✅ Rate Limit Detection Test:
Maximum sustainable RPS: 938 (tested range: 5-1000, 3s per test)

With Debug Logging

When using --log-level=debug, you'll see detailed HTTP request/response information including:

• Request URLs with query parameters
• Response status codes and content
• Request durations
• Error details for failed requests

Real-World Test Examples

Cryptocurrency APIs

# Coinbase BTC price
./rest-performance-analyzer "https://api.coinbase.com/v2/prices/BTC-USD/spot"

# Kraken ticker data
./rest-performance-analyzer "https://api.kraken.com/0/public/Ticker" --pair=XXBTZUSD

# CoinGecko API
./rest-performance-analyzer "https://api.coingecko.com/api/v3/simple/price" --ids=bitcoin --vs_currencies=usd

Public Testing APIs

# JSONPlaceholder (fake REST API for testing)
./rest-performance-analyzer "https://jsonplaceholder.typicode.com/posts/1"

# HTTPBin (HTTP testing service)
./rest-performance-analyzer "https://httpbin.org/json"
./rest-performance-analyzer "https://httpbin.org/delay/2"

# ReqRes API (testing REST services)
./rest-performance-analyzer "https://reqres.in/api/users/2"

Rate Limit Testing (Use with Caution!)

# Conservative rate limit test - safe for demos
./rest-performance-analyzer --test=ratelimit --rate-low=1 --rate-high=3 --rate-duration=2 "https://api.coinbase.com/v2/prices/BTC-USD/spot"

# Test a more forgiving endpoint
./rest-performance-analyzer --test=ratelimit --rate-low=5 --rate-high=10 --rate-duration=2 "https://httpbin.org/json"

CI/CD Integration Examples

# Quick health check
./rest-performance-analyzer --requests=10 --timeout=5 "https://api.github.com/zen"

# Comprehensive API testing
./rest-performance-analyzer --test=all --requests=10 --rate-low=1 --rate-high=3 --rate-duration=2 "https://jsonplaceholder.typicode.com/posts/1"

# Monitor endpoint performance
./rest-performance-analyzer --requests=20 --log-level=warn "https://httpbin.org/delay/1"

Configuration Files

The tool supports YAML configuration files for complex testing scenarios:

config.yaml - Main Configuration

num_requests: 100
timeout: "10s"
log_level: "info"
test_type: "basic"

rate_limit:
  sleep: "1s"
  low_rps: 1
  high_rps: 10
  test_duration: "3s"

endpoints:
  - name: "Coinbase BTC Price"
    url: "https://api.coinbase.com/v2/prices/BTC-USD/spot"
    params: {}
  - name: "Kraken Ticker"
    url: "https://api.kraken.com/0/public/Ticker"
    params:
      pair: "XXBTZUSD"

Configuration Flexibility

The configuration file provides sensible defaults, but you can override any setting with CLI flags:

CI/CD Usage:

./rest-performance-analyzer --config config.yaml --requests=10 --timeout=5 --log-level=warn

Rate Limit Testing:

./rest-performance-analyzer --config config.yaml --test=ratelimit --rate-high=3 --rate-duration=2 --log-level=debug

Development Testing:

./rest-performance-analyzer --config config.yaml --test=all --requests=10 --rate-low=1 --rate-high=3 --rate-duration=2

Configuration Priority

1. CLI flags override everything
2. Config file settings are used if no CLI override
3. Built-in defaults are used as fallback

Architecture

The tool follows a modular architecture:

• main.go: CLI interface and configuration
• client/: HTTP client with timing and logging
• tester/: Modular test framework with individual test implementations
  • latency.go: Latency measurement and statistics
  • uptime.go: Success rate and error tracking
  • ratelimit.go: Binary search rate limit detection

Development

Building

go build -o rest-performance-analyzer .

Testing

go test ./...

Adding New Tests

1. Implement the Tester interface in a new file
2. Add the tester to NewRunner() in tester/tester.go
3. Add CLI support in main.go

Safety Notes

• Rate Limit Testing: Use conservative ranges to avoid getting banned from APIs
• Demo Settings: Default rate limits (1-10 RPS) are safe for demonstrations
• Production APIs: Always check API documentation for rate limits before testing
• Error Logging: Use debug mode to investigate issues without overwhelming logs

Quick Start

Try these commands to see the tool in action:

# Build the tool
go build -o rest-performance-analyzer .

# Quick test with a reliable endpoint
./rest-performance-analyzer --requests=10 "https://httpbin.org/json"

# Use the configuration file
./rest-performance-analyzer --config config.yaml

# See detailed HTTP information
./rest-performance-analyzer --requests=5 --log-level=debug "https://api.github.com/zen"

# Test rate limiting (very conservative)
./rest-performance-analyzer --test=ratelimit --rate-low=1 --rate-high=3 --rate-duration=2 "https://api.coinbase.com/v2/prices/BTC-USD/spot"

License

Licensed under the Apache License, Version 2.0. See LICENSE for details.