GraphQL HAR Performance Analyzer

A Python tool for analyzing and visualizing GraphQL performance data from HAR files. Helps identify slow, unstable, and frequently called operations in GraphQL API.

Features

• 📊 Analyzes GraphQL operations timing and patterns
• 🔍 Identifies problematic queries needing optimization
• 📈 Generates visual performance reports
• 📉 Shows timing distribution and breakdowns
• 🎯 Highlights operations exceeding performance thresholds

Installation

1. Clone the repository:

git clone https://github.com/felistter/har-anayzer.git
cd har-anayzer

2. Install dependencies: Install poetry as described in the official documentation.

poetry install

Usage

1. Record a HAR file using Chrome DevTools:

   • Open DevTools (F12)
   • Go to Network tab
   • Check "Preserve log"
   • Filter by "Fetch/XHR"
   • Perform your operations
   • Right-click → "Save all as HAR with content"

2. Run the analyzer:

poetry run python har_analyzer/main.py input.har output_prefix

This will generate:

• output_prefix_metrics.csv - Detailed metrics for all operations
• output_prefix_response_times.png - Distribution of response times
• output_prefix_top_50_slow.png - Top 50 slowest operations with frequency indicators
• output_prefix_timing_breakdown.png - Timing phase analysis

Understanding the Output

Top 50 Slowest Operations Chart

• Bar length shows average response time
• Color intensity indicates call frequency (darker = more calls)
• Red dashed line marks 1000ms threshold
• Numbers in parentheses show call count
• Summary stats in bottom right corner

Analysis Report

The tool identifies:

• Slow queries (above 95th percentile)
• Unstable queries (high variance)
• Frequently called queries
• Queries with large response sizes

Example output:

=== GraphQL Operations Analysis ===
Total Operations: 1500
Unique Operations: 45
Average Response Time: 235.7ms
95th Percentile Response Time: 892.3ms

Notes

• Only analyzes GraphQL POST requests
• Requires HAR files with complete request/response data
• Best used with Chrome DevTools HAR export