API Latency Testing Tool

A lightweight CLI tool to measure API performance through sequential HTTP requests. Perfect for monitoring API latency, testing response times, and evaluating API performance under different conditions.

Features

• 🚀 Fast & Lightweight: Minimal dependencies, maximum performance
• 📊 Detailed Metrics: Average, min, max latency with performance categorization
• 🎯 Flexible Configuration: Customizable request count, timeout, and delays
• 💾 Persistent Logging: JSON-formatted results with session tracking
• 🌐 Global CLI: Install once, use anywhere
• 📈 Performance Categories: Automatic categorization (Fast/Medium/Slow)

Installation

Global Installation (Recommended)

npm install -g apin-test

After global installation, you can use apin command from anywhere:

apin "https://api.example.com/health" --count 5 --timeout 30000 --delay 300

Local Installation

npm install apin-test

Then run using npx:

npx apin "https://api.example.com/health" --count 5

Usage

Basic Usage

apin <url> [options]

Examples

# Basic test with default settings (5 requests, 30s timeout, 300ms delay)
apin "https://jsonplaceholder.typicode.com/posts/1"

# Custom configuration
apin "https://api.example.com/health" --count 10 --timeout 5000 --delay 1000

# Save results to custom location
apin "https://api.example.com/users" --count 3 --log-path ./my-results.json

# Quick test with minimal delay
apin "https://httpbin.org/get" --count 2 --delay 100

Command Line Options

Option	Short	Description	Default
--count	-c	Number of requests to perform	5
--timeout	-t	Request timeout in milliseconds	30000
--delay	-d	Delay between requests in milliseconds	300
--log-path	-l	Path to save test results	~/latency-test-results.json
--version	-V	Show version number	-
--help	-h	Show help information	-

Performance Categories

APIN automatically categorizes response times:

• Fast (Excellent): < 300ms ⚡
• Medium (Acceptable/Good): 300-1000ms 🟡
• Slow (Poor/Unacceptable): > 1000ms 🔴

Output Format

Console Output

🔧 API Latency Testing Tool v1.0.0
============================================================

🎯 Starting API latency test...
📍 Target URL: https://jsonplaceholder.typicode.com/posts/1
🔢 Number of requests: 2
⏱️  Timeout: 10000ms
⏳ Delay between requests: 1000ms
💾 Log file: /home/user/latency-test-results.json
============================================================

🚀 Request 1: Starting...
✅ Request 1: 181ms (Status: 200) - Fast (Excellent)
🚀 Request 2: Starting...
✅ Request 2: 37ms (Status: 200) - Fast (Excellent)

============================================================
📊 TEST RESULTS SUMMARY
============================================================

📋 Individual Request Results:
────────────────────────────────────────────────────────────
✅ Request 1: 181ms - SUCCESS (Fast (Excellent))
✅ Request 2: 37ms - SUCCESS (Fast (Excellent))

📈 Performance Metrics:
────────────────────────────────────────────────────────────
🎯 Total Requests: 2
✅ Successful: 2
❌ Failed: 0
📊 Success Rate: 100%
⚡ Average Latency: 109ms
🏷️ Average Category: Fast (Excellent)
🚀 Fastest Request: 37ms
🐌 Slowest Request: 181ms
============================================================

💾 Results saved to: /home/user/latency-test-results.json
🆔 Session ID: bced0e2e-253e-4de8-93ca-a520f31e2e48

JSON Log Format

[
  {
    "sessionId": "bced0e2e-253e-4de8-93ca-a520f31e2e48",
    "timestamp": "2024-01-15T10:30:45.123Z",
    "apiUrl": "https://jsonplaceholder.typicode.com/posts/1",
    "configuration": {
      "requestCount": 2,
      "timeout": 10000,
      "delayMs": 1000
    },
    "evaluationCriteria": {
      "fast": "<300ms",
      "medium": "300-1000ms",
      "slow": ">1000ms"
    },
    "results": [
      {
        "requestNumber": 1,
        "latency": 181,
        "timestamp": "2024-01-15T10:30:45.123Z",
        "statusCode": 200,
        "success": true,
        "errorMessage": null,
        "category": "Fast (Excellent)"
      }
    ],
    "summary": {
      "totalRequests": 2,
      "successfulRequests": 2,
      "failedRequests": 0,
      "averageLatency": 109,
      "minLatency": 37,
      "maxLatency": 181,
      "successRate": 100,
      "averageCategory": "Fast (Excellent)"
    }
  }
]

Exit Codes

• 0: All requests successful
• 1: One or more requests failed

Requirements

• Node.js >= 18.0.0
• Internet connection for API testing

Development

Local Development Setup

# Clone the repository
git clone https://github.com/arifintahu/api-latency-test.git
cd test-api-latency

# Install dependencies
npm install

# Test locally
node bin/apin.js "https://jsonplaceholder.typicode.com/posts/1" --count 2

# Link for global testing
npm link
apin "https://jsonplaceholder.typicode.com/posts/1" --count 2

Project Structure

├── bin/
│   └── apin.js          # CLI entry point
├── latency-test.js      # Core testing logic
├── package.json         # Package configuration
└── README.md           # Documentation

License

MIT

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Support

If you encounter any issues or have questions, please file an issue on the project repository.