Spanish Rules Library
For AI & apps
Spanish Rules Library publishes the same source of truth that people read as a JSON API, AI-readable Markdown (ai.md), and an llms.txt index — free to reuse under CC BY-SA 4.0 with attribution.
Every rule and verb on this site is generated from structured content and published in machine-readable form. Language apps, assistants, and agents can consume exactly the same source of truth that humans read — no scraping required.
The whole site is a static export with a pre-generated, file-based API: stable URLs, no query parameters, no rate limits, no API keys. Start from the llms.txt index, then fetch the JSON or AI-readable Markdown for any rule or verb.
API endpoints
/llms.txt | Index of resources, languages, and licensing — the place for an AI to start. |
/api/taxonomy | Every stable rule ID. IDs are permanent and safe to reference. |
/api/rules/list/{lang} | All published rules for a language, with titles and summaries. |
/api/rules/{id}/json | One rule as structured JSON: explanation, examples, levels, related rules. |
/api/rules/{id}/ai.md | One rule as AI-readable Markdown, with the attribution footer built in. |
/api/verbs/index | Index of all 638 verbs, every form machine-verified. |
/api/verbs/{infinitive} | Full conjugation table: simple and compound tenses, voseo, imperatives, reflexives. |
/api/mistakes/list | Common-mistake entries linked to the rules that explain them. |
/api/search-index | A single filterable index of rules and verbs for client-side search. |
Formats & stability
Rule IDs are permanent. Once an ID is published it will not be renamed or reused, so you can store references to it safely.
Content is additive per language: English is always present; French, German, and Spanish are added per rule, falling back to English when a translation is not yet available.
Verb tables are machine-generated and machine-verified (637/637 verified across ~68,500 cells), so conjugations are consistent and exhaustive rather than hand-curated.
Licensing & attribution
Generic content (every rule ID except regional.*) and the verb tables are licensed CC BY-SA 4.0. Attribution: “Spanish Rules Library — spanishruleslibrary.com — CC BY-SA 4.0”. The ai.md output carries this footer automatically.
Regional content (regional.* IDs) is all rights reserved — contact us for licensing. The site's source code is MIT.
https://spanishruleslibrary.com/llms.txt