Turn the FDA's FSMA 204 traceability mandate into working Python.
A production-focused, engineer-first resource for automating food traceability, KDE mapping,
supplier data sync, and the rehearsed 24-hour recall response.
🌐 Live site · 📚 All content · 🚨 Recall simulation
FSMA 204 (21 CFR Part 1, Subpart S) rewrote food traceability from a paper-and-binders exercise into an engineering mandate. Any facility that handles a food on the FDA Food Traceability List must capture validated Key Data Elements (KDEs) at every Critical Tracking Event, store them immutably, and reconstruct a complete product journey as a sortable electronic record within 24 hours of an FDA request during an outbreak.
Most guidance stops at the regulation. This site starts where the regulation ends: it pairs each obligation with runnable, production-grade Python — pydantic v2 validation, tenacity retry logic, quarantine routing, hash-chained ledgers, and benchmarked recall queries — so food-safety and platform teams can ship a system that actually holds up under FDA scrutiny.
It is written for food safety managers, supply-chain compliance teams, and the AgTech and automation developers who implement the code.
The library is organized into three connected disciplines, each a hands-on guide from regulation to running code:
| Area | What it covers |
|---|---|
| 🧭 FSMA 204 Architecture & KDE Compliance Mapping | The reference architecture: append-only KDE pipelines, the Subpart S data contract, field mapping, retention, security boundaries, hash-chained tamper-evidence, and FDA-aligned audit exports. |
| 🔄 Supplier Data Ingestion & Sync Automation | Normalizing EDI/CSV/API supplier feeds, schema validation, GS1 identifier (GLN/GTIN/SSCC) check digits, high-volume async ingestion, backpressure, retries, and dead-letter routing. |
| 🚨 Recall Simulation & FDA 24-Hour Response | Lot-level recall scoping, one-up/one-back chain reconstruction, sortable-spreadsheet exports, and scheduled mock recall drills that prove the 24-hour window before a real event. |
- Simulate an FDA 24-hour traceability record request
- Map FSMA 204 KDEs to SQL schemas
- Validate GS1 GLN check digits in Python
- Reconstruct trace chains with NetworkX
- Hash-chain KDE records for tamper-evidence
- Configure async Celery workers for CTE ingestion
A fast, dependency-light static site engineered to the same standard as its content:
- Eleventy (11ty) static site generator — no client framework, no runtime.
- Self-hosted everything — fonts, styles, and icons ship from origin; zero third-party requests.
- Hand-authored inline SVG diagrams that adapt to light/dark themes via
currentColor. - Structured data (Article, TechArticle, BreadcrumbList, FAQPage, HowTo JSON-LD) on every page.
- Installable PWA with an offline-capable service worker.
- Deployed on Cloudflare Workers as a static-assets Worker.
- Quality-gated — every page passes a deterministic suite covering accessibility (WCAG 2 A/AA via axe-core), link integrity, structured-data validity, SEO metadata, responsive layout, and mobile performance before it ships.
content/ Markdown source for every page (organized by topic area)
_data/ Site metadata + the navigation tree built from content/
_includes/ Nunjucks layouts, the icon set, and page templates
assets/ Styles, fonts, images, and generated icons
index.njk Homepage
.eleventy.js Build configuration
Build locally:
npm install
npm run build # outputs the static site to _site/
npm run serve # local dev server with live reloadIssues and pull requests that improve accuracy, add practitioner guides, or sharpen the code examples are welcome. Please keep code Python 3.10+ with explicit type annotations and pydantic v2, and match the existing page structure.
Released under the MIT License. Code samples are provided as-is; validate against the current FDA guidance before relying on them in a regulated production system.
Compliance is an engineering discipline. This is the code.
www.food-safety-traceability.org