Real Production Codebases Analyzed

Code Analysis Demos (As Of 04MAY2026)

Explore architectural insights from 8 frameworks across 7 languages - including PViz analyzing itself!

Fastify

JavaScript

Fast and low overhead web framework for Node.js

View on GitHub32.7k stars
Fastify logo
Repository
JavaScript
282
Files Analyzed
262
Functions
60k
Lines of Code
1.2
Coupling Density
Circular DependenciesNone
God ModulesNone ✓
Coupling QualityExcellent

Key Findings

✓

Zero SCCs detected — no circular dependency groups found across 282 files

✓

Exceptional modularity: 343 edges across 282 files for average coupling of 1.2

✓

Complete parse coverage: all 282 nodes parsed ok with zero errors or stubs

ℹ

Language mix: 257 JavaScript files, 19 TypeScript definition files, and 6 MJS files; fastify.js is the central hub with 83 importers

Download the Analysis Bundle

Both formats contain the complete structural analysis. Choose based on how you plan to use it.

Compressed Bundle

303 KB

Abbreviated field names, minimal whitespace. Sized to fit an LLM's context window so you can paste the full architecture into Claude, GPT, or Cursor.

  • Fits LLM context windows
  • Faster parsing & loading
  • Ideal for programmatic use
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Readable Bundle

754 KB

Full field names, pretty-printed JSON. Useful for exploring the schema and understanding exactly what PViz captures before running it on your own repo.

  • Self-documenting structure
  • Explore the full schema
  • Understand output before signing up
Download Readable

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