# ChemFYI.com — Full Content Index

> Chemistry encyclopedia — 118 elements, 5K+ compounds, reactions, experiments, and educational guides in 15 languages.

## URL Patterns

- /element/{symbol}/ — Element detail page (e.g. /element/H/, /element/Fe/)
- /compound/{slug}/ — Compound detail page
- /reaction/{slug}/ — Reaction detail page
- /experiment/{slug}/ — Experiment detail page
- /application/{slug}/ — Industrial application detail
- /compare/{a}-vs-{b}/ — Element comparison
- /guide/{slug}/ — Guide article
- /glossary/{slug}/ — Glossary term
- /tool/{slug}/ — Chemistry calculator/tool
- /category/{slug}/ — Element category page
- /developers/ — Developer platform
- /subscribe/ — Feed discovery hub

## REST API

Base URL: https://chemfyi.com/api/

- GET /api/elements/ — List elements (?q=, ?category=, ?block=, ?period=, ?phase=, ?lang=)
- GET /api/elements/{symbol}/ — Element detail (?lang=)
- GET /api/categories/ — List categories (?lang=)
- GET /api/categories/{slug}/ — Category detail (?lang=)
- GET /api/compounds/ — List compounds (?q=, ?type=, ?state=, ?lang=)
- GET /api/compounds/{slug}/ — Compound detail (?lang=)
- GET /api/reactions/ — List reactions (?type=, ?lang=)
- GET /api/reactions/{slug}/ — Reaction detail (?lang=)
- GET /api/glossary/ — List glossary terms (?category=, ?q=, ?lang=)
- GET /api/glossary/{slug}/ — Glossary term detail (?lang=)
- GET /api/guides/ — List guides (?series=, ?lang=)
- GET /api/guides/{slug}/ — Guide detail (?lang=)
- GET /api/experiments/ — List experiments (?category=, ?difficulty=, ?lang=)
- GET /api/experiments/{slug}/ — Experiment detail (?lang=)
- GET /api/applications/ — List applications (?sector=, ?scale=, ?lang=)
- GET /api/applications/{slug}/ — Application detail (?lang=)
- GET /api/search/?q= — Search across all models
- GET /api/stats/ — Database statistics
- GET /api/languages/ — Available languages
- GET https://chemfyi.com/api/schema/ — OpenAPI 3.0 schema
- GET https://chemfyi.com/api/docs/ — Swagger UI

## Markdown Access

Append .md to any page URL: /element/h.md
Returns text/markdown with X-Robots-Tag: noindex and CORS headers.

## i18n

All pages available in 15 languages. Prefix URL with language code:
- /ko/ (Korean), /ja/ (Japanese), /zh-hans/ (Chinese Simplified)
- /es/ (Spanish), /fr/ (French), /de/ (German), /pt/ (Portuguese)
- /ru/ (Russian), /ar/ (Arabic), /hi/ (Hindi)
- /th/ (Thai), /vi/ (Vietnamese), /id/ (Indonesian), /tr/ (Turkish)

API uses ?lang= parameter instead of URL prefixes.

## Feeds

- Guides RSS: https://chemfyi.com/feed/rss/
- Guides Atom: https://chemfyi.com/feed/atom/
- Experiments RSS: https://chemfyi.com/experiments/feed/rss/
- Experiments Atom: https://chemfyi.com/experiments/feed/atom/