# aceakira1017/lyrist architecture

> Architecture diagram of the GitHub repository aceakira1017/lyrist, 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/aceakira1017/lyrist
- Repository: https://github.com/aceakira1017/lyrist

## Overview

#### Purpose and Runtime
Lyrist is a Next.js application exposing a lyrics lookup REST API and a small browser playground/guide. It accepts a song name and artist, retrieves lyrics through the external `lyrics-dumper` package, and is intended for Vercel deployment. The Pages Router provides both serverless API handling and rendered UI.

#### Entry Points and Routing
- Application-wide initialization, global styles, and shared page shell begin at `src/pages/_app.tsx`.
- The primary playground is `src/pages/index.tsx`; usage documentation is served by `src/pages/guide.tsx`.
- A catch-all API route, `src/pages/api/[...query].ts`, is the backend entry point. Its route segments determine the requested API operation rather than using multiple dedicated endpoint files.

#### Lyrics API Boundary
`src/pages/api/[...query].ts` is the key server boundary: it validates/parses incoming API requests, applies the documented per-user rate limit, invokes lyric retrieval, and serializes HTTP responses. It isolates client pages from the lyrics provider and should be the place to preserve request validation, error mapping, and abuse controls.

The external lyrics acquisition dependency is LyricsDumper; its network/provider behavior is behind this API route rather than exposed directly to browser code.

#### Client Playground and Presentation
- `src/pages/index.tsx` provides the interactive API playground, likely constructing requests to the local catch-all API route and rendering results.
- `src/pages/guide.tsx` provides human-facing endpoint guidance.
- `src/components/Layout.tsx`, `src/components/Header.tsx`, and `src/components/Footer.tsx` form the reusable page composition layer.
- `src/components/Meta.tsx` centralizes document metadata/head behavior for public pages.

This separation keeps the UI as an API consumer and leaves lyric retrieval/server concerns on the API runtime.

#### Environment and Configuration Boundary
Environment variables are split into client, server, and shared-schema modules:
- `src/env/schema.mjs`
- `src/env/client.mjs`
- `src/env/server.mjs`

This structure is architecturally important because server-only credentials or provider settings should remain inaccessible to browser bundles. `.env.example` documents the expected local environment contract.

#### Styling and Deployment
Tailwind drives the presentation system through `tailwind.config.cjs` and `src/styles/globals.css`. Next.js behavior is configured in `next.config.mjs`. The project targets Vercel, where Pages Router API routes run as deployment-managed serverless functions; rate-limit state therefore must be compatible with that execution model if it requires cross-instance persistence.

Main entry points: [`src/components/Layout.tsx`](https://github.com/aceakira1017/lyrist/blob/main/src/components/Layout.tsx) (Page layout), [`src/pages/api/[...query].ts`](https://github.com/aceakira1017/lyrist/blob/main/src/pages/api/%5B...query%5D.ts) (Catch-all lyrics API), [`src/pages/_app.tsx`](https://github.com/aceakira1017/lyrist/blob/main/src/pages/_app.tsx) (App shell), [`src/pages/index.tsx`](https://github.com/aceakira1017/lyrist/blob/main/src/pages/index.tsx) (API playground)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_browser["Browser UI"]
  node_app["App shell<br/>Next.js bootstrap<br/>[_app.tsx]"]
  node_playground["API playground<br/>Next.js page<br/>[index.tsx]"]
  node_guide["API guide<br/>Next.js page<br/>[guide.tsx]"]
  node_layout["Page layout<br/>shared component<br/>[Layout.tsx]"]
  node_header["Header<br/>shared component<br/>[Header.tsx]"]
  node_footer["Footer<br/>shared component<br/>[Footer.tsx]"]
  node_meta["Document metadata<br/>head component<br/>[Meta.tsx]"]
  node_styles["Global styling<br/>Tailwind CSS<br/>[globals.css]"]
  node_tailwind_config["Tailwind config<br/>build configuration"]
end

subgraph group_server["Server API"]
  node_api_route{{"Catch-all lyrics API<br/>Pages API route<br/>[&#91;...query&#93;.ts]"}}
  node_rate_limit["Rate limiting<br/>API control<br/>[&#91;...query&#93;.ts]"]
end

subgraph group_environment["Environment Boundary"]
  node_client_env["Client environment<br/>env module<br/>[client.mjs]"]
  node_server_env["Server environment<br/>env module<br/>[server.mjs]"]
  node_env_schema["Environment schema<br/>env validation<br/>[schema.mjs]"]
  node_env_example["Environment example<br/>environment contract<br/>[.env.example]"]
end

subgraph group_platform["Deployment &amp; Providers"]
  node_lyrics_dumper{{"LyricsDumper<br/>external package"}}
  node_next_config["Next.js config<br/>framework configuration<br/>[next.config.mjs]"]
  node_vercel{{"Vercel<br/>serverless platform"}}
end

node_app -->|"renders"| node_playground
node_app -->|"renders"| node_guide
node_app -->|"loads"| node_styles
node_playground -->|"uses"| node_layout
node_guide -->|"uses"| node_layout
node_layout -->|"composes"| node_header
node_layout -->|"composes"| node_footer
node_layout -->|"sets"| node_meta
node_playground -->|"requests lyrics"| node_api_route
node_api_route -->|"applies"| node_rate_limit
node_api_route -->|"retrieves lyrics through"| node_lyrics_dumper
node_api_route -->|"reads server settings"| node_server_env
node_client_env -->|"validates against"| node_env_schema
node_server_env -->|"validates against"| node_env_schema
node_env_example -.->|"documents"| node_env_schema
node_tailwind_config -->|"configures"| node_styles
node_next_config -.->|"configures"| node_app
node_vercel -->|"runs as serverless function"| node_api_route
node_vercel -->|"serves pages"| node_app

click node_app "https://github.com/aceakira1017/lyrist/blob/main/src/pages/_app.tsx"
click node_playground "https://github.com/aceakira1017/lyrist/blob/main/src/pages/index.tsx"
click node_guide "https://github.com/aceakira1017/lyrist/blob/main/src/pages/guide.tsx"
click node_layout "https://github.com/aceakira1017/lyrist/blob/main/src/components/Layout.tsx"
click node_header "https://github.com/aceakira1017/lyrist/blob/main/src/components/Header.tsx"
click node_footer "https://github.com/aceakira1017/lyrist/blob/main/src/components/Footer.tsx"
click node_meta "https://github.com/aceakira1017/lyrist/blob/main/src/components/Meta.tsx"
click node_api_route "https://github.com/aceakira1017/lyrist/blob/main/src/pages/api/%5B...query%5D.ts"
click node_rate_limit "https://github.com/aceakira1017/lyrist/blob/main/src/pages/api/%5B...query%5D.ts"
click node_client_env "https://github.com/aceakira1017/lyrist/blob/main/src/env/client.mjs"
click node_server_env "https://github.com/aceakira1017/lyrist/blob/main/src/env/server.mjs"
click node_env_schema "https://github.com/aceakira1017/lyrist/blob/main/src/env/schema.mjs"
click node_env_example "https://github.com/aceakira1017/lyrist/blob/main/.env.example"
click node_styles "https://github.com/aceakira1017/lyrist/blob/main/src/styles/globals.css"
click node_tailwind_config "https://github.com/aceakira1017/lyrist/blob/main/tailwind.config.cjs"
click node_next_config "https://github.com/aceakira1017/lyrist/blob/main/next.config.mjs"

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_playground,node_guide,node_layout,node_header,node_footer,node_meta,node_styles,node_tailwind_config toneBlue
class node_api_route,node_rate_limit toneAmber
class node_client_env,node_server_env,node_env_schema,node_env_example toneMint
class node_lyrics_dumper,node_next_config,node_vercel toneRose
```

## Components

### Browser UI

- [App shell](https://github.com/aceakira1017/lyrist/blob/main/src/pages/_app.tsx): Next.js bootstrap · Initializes global styles and shared page shell. · `src/pages/_app.tsx`
- [API playground](https://github.com/aceakira1017/lyrist/blob/main/src/pages/index.tsx): Next.js page · Interactive lyrics API consumer. · `src/pages/index.tsx`
- [API guide](https://github.com/aceakira1017/lyrist/blob/main/src/pages/guide.tsx): Next.js page · Human-facing endpoint documentation. · `src/pages/guide.tsx`
- [Page layout](https://github.com/aceakira1017/lyrist/blob/main/src/components/Layout.tsx): shared component · Composes reusable public-page structure. · `src/components/Layout.tsx`
- [Header](https://github.com/aceakira1017/lyrist/blob/main/src/components/Header.tsx): shared component · `src/components/Header.tsx`
- [Footer](https://github.com/aceakira1017/lyrist/blob/main/src/components/Footer.tsx): shared component · `src/components/Footer.tsx`
- [Document metadata](https://github.com/aceakira1017/lyrist/blob/main/src/components/Meta.tsx): head component · `src/components/Meta.tsx`
- [Global styling](https://github.com/aceakira1017/lyrist/blob/main/src/styles/globals.css): Tailwind CSS · Global styles and Tailwind-driven presentation. · `src/styles/globals.css`
- [Tailwind config](https://github.com/aceakira1017/lyrist/blob/main/tailwind.config.cjs): build configuration · `tailwind.config.cjs`

### Server API

- [Catch-all lyrics API](https://github.com/aceakira1017/lyrist/blob/main/src/pages/api/%5B...query%5D.ts): Pages API route · Parses operations, validates requests, rate-limits, retrieves lyrics, and maps HTTP responses. · `src/pages/api/[...query].ts`
- [Rate limiting](https://github.com/aceakira1017/lyrist/blob/main/src/pages/api/%5B...query%5D.ts): API control · Per-user abuse control applied at the API boundary. · `src/pages/api/[...query].ts`

### Environment Boundary

- [Client environment](https://github.com/aceakira1017/lyrist/blob/main/src/env/client.mjs): env module · Browser-safe environment values. · `src/env/client.mjs`
- [Server environment](https://github.com/aceakira1017/lyrist/blob/main/src/env/server.mjs): env module · Server-only credentials and provider settings. · `src/env/server.mjs`
- [Environment schema](https://github.com/aceakira1017/lyrist/blob/main/src/env/schema.mjs): env validation · Shared environment contract schema. · `src/env/schema.mjs`
- [Environment example](https://github.com/aceakira1017/lyrist/blob/main/.env.example): environment contract · Documents expected local variables. · `.env.example`

### Deployment & Providers

- **LyricsDumper**: external package · Provider-facing lyrics acquisition dependency.
- [Next.js config](https://github.com/aceakira1017/lyrist/blob/main/next.config.mjs): framework configuration · `next.config.mjs`
- **Vercel**: serverless platform · Hosts Pages Router pages and API functions.

## Connections

- App shell → API playground: renders
- App shell → API guide: renders
- App shell → Global styling: loads
- API playground → Page layout: uses
- API guide → Page layout: uses
- Page layout → Header: composes
- Page layout → Footer: composes
- Page layout → Document metadata: sets
- API playground → Catch-all lyrics API: requests lyrics
- Catch-all lyrics API → Rate limiting: applies
- Catch-all lyrics API → LyricsDumper: retrieves lyrics through
- Catch-all lyrics API → Server environment: reads server settings
- Client environment → Environment schema: validates against
- Server environment → Environment schema: validates against
- Environment example → Environment schema: documents
- Tailwind config → Global styling: configures
- Next.js config → App shell: configures
- Vercel → Catch-all lyrics API: runs as serverless function
- Vercel → App shell: serves pages