# wh-iterabb-it/meowfacts architecture

> Architecture diagram of the GitHub repository wh-iterabb-it/meowfacts, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-29). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/wh-iterabb-it/meowfacts
- Repository: https://github.com/wh-iterabb-it/meowfacts

## Overview

meowfacts is a small Express API that serves cat facts. A client requests a random or ID-selected fact, multiple facts, or a language-specific response; the app applies query-validation middleware and delegates fact selection to the facts model. The API also exposes language options and health information. Localization modules supply the multilingual fact data. The map focuses on runtime behavior; the README documents the API capabilities, while the source excerpts show the request flow and localization loading. It does not show any persistent store or external runtime service.

Main entry points: [`src/models/localizations/index.js`](https://github.com/wh-iterabb-it/meowfacts/blob/main/src/models/localizations/index.js) (Language Registry), [`src/app.js`](https://github.com/wh-iterabb-it/meowfacts/blob/main/src/app.js) (Express API), [`src/middleware.js`](https://github.com/wh-iterabb-it/meowfacts/blob/main/src/middleware.js) (Query Validation), [`src/models/facts.js`](https://github.com/wh-iterabb-it/meowfacts/blob/main/src/models/facts.js) (Fact Selection)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_requests["API Requests"]
  node_app["Express API<br/>[app.js]"]
  node_validation["Query Validation<br/>[middleware.js]"]
end

subgraph group_facts["Fact Selection"]
  node_fact_model["Fact Selection<br/>[facts.js]"]
end

subgraph group_languages["Localization"]
  node_localization_registry["Language Registry<br/>[index.js]"]
  node_default_languages["Language Defaults"]
  node_fact_catalog["Localized Fact Catalog"]
end

node_client(("API Client"))

node_client -->|"sends GET"| node_app
node_app -->|"registers middleware"| node_validation
node_app -->|"requests facts"| node_fact_model
node_validation -->|"checks fact limits"| node_fact_model
node_validation -->|"checks language codes"| node_localization_registry
node_fact_model -->|"resolves language"| node_localization_registry
node_localization_registry -->|"loads defaults"| node_default_languages
node_localization_registry -->|"loads language files"| node_fact_catalog
node_default_languages -->|"uses Spanish default"| node_fact_catalog

click node_app "https://github.com/wh-iterabb-it/meowfacts/blob/main/src/app.js"
click node_validation "https://github.com/wh-iterabb-it/meowfacts/blob/main/src/middleware.js"
click node_fact_model "https://github.com/wh-iterabb-it/meowfacts/blob/main/src/models/facts.js"
click node_localization_registry "https://github.com/wh-iterabb-it/meowfacts/blob/main/src/models/localizations/index.js"
click node_default_languages "https://github.com/wh-iterabb-it/meowfacts/blob/main/src/models/localizations/defaultLanguages.js"
click node_fact_catalog "https://github.com/wh-iterabb-it/meowfacts/tree/main/src/models/localizations"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_app,node_validation,node_client toneBlue
class node_fact_model toneAmber
class node_localization_registry,node_default_languages,node_fact_catalog toneMint
```

## Components

### API Requests

- [Express API](https://github.com/wh-iterabb-it/meowfacts/blob/main/src/app.js): `src/app.js`
- [Query Validation](https://github.com/wh-iterabb-it/meowfacts/blob/main/src/middleware.js): `src/middleware.js`

### Fact Selection

- [Fact Selection](https://github.com/wh-iterabb-it/meowfacts/blob/main/src/models/facts.js): `src/models/facts.js`

### Localization

- [Language Registry](https://github.com/wh-iterabb-it/meowfacts/blob/main/src/models/localizations/index.js): `src/models/localizations/index.js`
- [Language Defaults](https://github.com/wh-iterabb-it/meowfacts/blob/main/src/models/localizations/defaultLanguages.js): `src/models/localizations/defaultLanguages.js`
- [Localized Fact Catalog](https://github.com/wh-iterabb-it/meowfacts/tree/main/src/models/localizations): `src/models/localizations`

### Other components

- **API Client**

## Connections

- API Client → Express API: sends GET (evidence: `README.md`)
- Express API → Query Validation: registers middleware (evidence: `src/app.js`)
- Express API → Fact Selection: requests facts (evidence: `src/app.js`)
- Query Validation → Fact Selection: checks fact limits (evidence: `src/middleware.js`)
- Query Validation → Language Registry: checks language codes (evidence: `src/middleware.js`)
- Fact Selection → Language Registry: resolves language (evidence: `src/models/facts.js`)
- Language Registry → Language Defaults: loads defaults (evidence: `src/models/localizations/index.js`)
- Language Registry → Localized Fact Catalog: loads language files (evidence: `src/models/localizations/index.js`)
- Language Defaults → Localized Fact Catalog: uses Spanish default (evidence: `src/models/localizations/defaultLanguages.js`)