# geshan/nodejs-sqlite architecture

> Architecture diagram of the GitHub repository geshan/nodejs-sqlite, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-08-04). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/geshan/nodejs-sqlite
- Repository: https://github.com/geshan/nodejs-sqlite

## Overview

#### Purpose and Entry Point
A minimal Node.js HTTP API example demonstrating SQLite-backed quote retrieval. The application starts from `index.js`, with runtime settings loaded from `config.js`.

#### HTTP Application Layer
`index.js` creates and configures the server application, mounts quote routes, and listens on the configured port. It is the primary process boundary between HTTP clients and application logic.

Relevant paths:
- `index.js`
- `config.js`
- `routes/quotes.js`

#### Quote Routing
`routes/quotes.js` defines the API endpoint(s) for quotes and translates incoming HTTP requests into calls to the quote service. It owns HTTP concerns such as route matching and response delivery, while avoiding direct database behavior.

Relevant paths:
- `routes/quotes.js`
- `services/quotes.js`

#### Quote Domain Service
`services/quotes.js` contains the quote-oriented business/data-access operations used by routes. This layer separates endpoint behavior from SQL execution and is the main location to extend quote queries or add quote-related operations.

Relevant paths:
- `services/quotes.js`
- `routes/quotes.js`
- `services/db.js`

#### Database Access Boundary
`services/db.js` centralizes SQLite connection and query access. It isolates the rest of the application from the SQLite driver/API and establishes the persistence boundary for quote services.

Relevant paths:
- `services/db.js`
- `services/quotes.js`
- `quotes.db`

#### Persistence and Runtime Dependencies
SQLite is embedded and file-backed through `quotes.db`; no external database server is required. Node.js runs the API process, and dependencies are defined through the package manifests.

Relevant paths:
- `quotes.db`
- `package.json`
- `package-lock.json`

#### Primary Request Flow
A client request reaches the server in `index.js`, is dispatched to `routes/quotes.js`, handled by `services/quotes.js`, and executed through `services/db.js` against `quotes.db`. Results return through the same layers as an HTTP response. The key boundaries are HTTP routing versus quote logic, and quote logic versus SQLite access.

Main entry points: [`index.js`](https://github.com/geshan/nodejs-sqlite/blob/master/index.js) (API Server), [`routes/quotes.js`](https://github.com/geshan/nodejs-sqlite/blob/master/routes/quotes.js) (Quote Routes), [`services/quotes.js`](https://github.com/geshan/nodejs-sqlite/blob/master/services/quotes.js) (Quote Service), [`services/db.js`](https://github.com/geshan/nodejs-sqlite/blob/master/services/db.js) (SQLite Access)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_http["HTTP API"]
  node_app["API Server<br/>Node.js entry point<br/>[index.js]"]
  node_config["Runtime Config<br/>settings module<br/>[config.js]"]
  node_quote_routes["Quote Routes<br/>HTTP router<br/>[quotes.js]"]
end

subgraph group_quote["Quote Logic"]
  node_quote_service["Quote Service<br/>domain service<br/>[quotes.js]"]
end

subgraph group_persistence["Persistence"]
  node_db_access["SQLite Access<br/>database boundary<br/>[db.js]"]
  node_quotes_db[("Quotes Database<br/>SQLite file<br/>[quotes.db]")]
end

node_client(("HTTP Client<br/>external client"))
node_package_manifest["Package Manifest<br/>dependency manifest<br/>[package.json]"]
node_package_lock["Package Lock<br/>dependency lockfile<br/>[package-lock.json]"]

node_client -->|"HTTP request"| node_app
node_config -->|"runtime settings"| node_app
node_app -->|"mounts"| node_quote_routes
node_quote_routes -->|"quote operations"| node_quote_service
node_quote_service -->|"queries"| node_db_access
node_db_access -->|"SQLite reads"| node_quotes_db
node_package_manifest -.->|"dependencies"| node_app
node_package_lock -.->|"locks versions"| node_package_manifest

click node_app "https://github.com/geshan/nodejs-sqlite/blob/master/index.js"
click node_config "https://github.com/geshan/nodejs-sqlite/blob/master/config.js"
click node_quote_routes "https://github.com/geshan/nodejs-sqlite/blob/master/routes/quotes.js"
click node_quote_service "https://github.com/geshan/nodejs-sqlite/blob/master/services/quotes.js"
click node_db_access "https://github.com/geshan/nodejs-sqlite/blob/master/services/db.js"
click node_quotes_db "https://github.com/geshan/nodejs-sqlite/blob/master/quotes.db"
click node_package_manifest "https://github.com/geshan/nodejs-sqlite/blob/master/package.json"
click node_package_lock "https://github.com/geshan/nodejs-sqlite/blob/master/package-lock.json"

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_config,node_quote_routes toneBlue
class node_quote_service toneAmber
class node_db_access,node_quotes_db toneMint
class node_client,node_package_manifest,node_package_lock toneNeutral
```

## Components

### HTTP API

- [API Server](https://github.com/geshan/nodejs-sqlite/blob/master/index.js): Node.js entry point · Configures the HTTP application and listens for requests. · `index.js`
- [Runtime Config](https://github.com/geshan/nodejs-sqlite/blob/master/config.js): settings module · Provides the configured server port. · `config.js`
- [Quote Routes](https://github.com/geshan/nodejs-sqlite/blob/master/routes/quotes.js): HTTP router · Matches quote endpoints and delivers responses. · `routes/quotes.js`

### Quote Logic

- [Quote Service](https://github.com/geshan/nodejs-sqlite/blob/master/services/quotes.js): domain service · Contains quote query operations independent of HTTP handling. · `services/quotes.js`

### Persistence

- [SQLite Access](https://github.com/geshan/nodejs-sqlite/blob/master/services/db.js): database boundary · Centralizes SQLite connections and query execution. · `services/db.js`
- [Quotes Database](https://github.com/geshan/nodejs-sqlite/blob/master/quotes.db): SQLite file · Embedded file-backed quote persistence. · `quotes.db`

### Other components

- **HTTP Client**: external client
- [Package Manifest](https://github.com/geshan/nodejs-sqlite/blob/master/package.json): dependency manifest · Defines Node.js runtime dependencies. · `package.json`
- [Package Lock](https://github.com/geshan/nodejs-sqlite/blob/master/package-lock.json): dependency lockfile · `package-lock.json`

## Connections

- HTTP Client → API Server: HTTP request
- Runtime Config → API Server: runtime settings
- API Server → Quote Routes: mounts
- Quote Routes → Quote Service: quote operations
- Quote Service → SQLite Access: queries
- SQLite Access → Quotes Database: SQLite reads
- Package Manifest → API Server: dependencies
- Package Lock → Package Manifest: locks versions