# namhuynh1234kk-blip/melody architecture

> Architecture diagram of the GitHub repository namhuynh1234kk-blip/melody, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-25). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/namhuynh1234kk-blip/melody
- Repository: https://github.com/namhuynh1234kk-blip/melody

## Overview

MelodyVN is a browser-based music listening app with a Node/Express and MySQL backend. Its main workflow loads songs into the web app, lets listeners select and play tracks, and uses the server for catalog data. The product also documents or exposes favorites, discovery, accounts/admin song management, AI playlists, voice commands, visualizations, and shared listening rooms. The sampled excerpts show key client/server calls, but not every route or subsystem implementation, so uncertain wiring is omitted.

Main entry points: [`server.js`](https://github.com/namhuynh1234kk-blip/melody/blob/main/server.js) (API and socket server), [`js/app.js`](https://github.com/namhuynh1234kk-blip/melody/blob/main/js/app.js) (Web app), [`js/player.js`](https://github.com/namhuynh1234kk-blip/melody/blob/main/js/player.js) (Audio player and queue), [`js/voice.js`](https://github.com/namhuynh1234kk-blip/melody/blob/main/js/voice.js) (Voice assistant)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_web["Web listening"]
  node_webapp["Web app<br/>[app.js]"]
  node_page["App page<br/>[index.html]"]
  node_localplaylist["Local playlist<br/>[data.js]"]
  node_catalog["Catalog and discovery<br/>[app.js]"]
  node_accounts["Accounts and admin<br/>[app.js]"]
end

subgraph group_playback["Playback experience"]
  node_player["Audio player and queue<br/>[player.js]"]
  node_visualizer["Audio visualizer<br/>[visualizer.js]"]
  node_voice["Voice assistant<br/>[voice.js]"]
  node_mascot["AI mascot<br/>[melody3d.js]"]
end

subgraph group_backend["Backend services"]
  node_server["API and socket server<br/>[server.js]"]
  node_mysql[("MySQL data<br/>[melodyvn.sql]")]
end

subgraph group_social["Social listening"]
  node_roomclient["Room client<br/>[room.js]"]
end

node_listener(("Listener"))
node_openai{{"OpenAI API"}}
node_browseraudio["Browser audio"]
node_speech["Browser speech APIs"]

node_listener -->|"opens"| node_page
node_page -->|"loads interface"| node_webapp
node_webapp -->|"initializes"| node_player
node_webapp -->|"requests songs"| node_catalog
node_catalog -->|"fetches catalog"| node_server
node_server -->|"queries"| node_mysql
node_webapp -->|"requests account actions"| node_accounts
node_accounts -->|"calls account APIs"| node_server
node_webapp -->|"loads and saves"| node_localplaylist
node_player -->|"plays audio"| node_browseraudio
node_visualizer -->|"analyzes playback"| node_browseraudio
node_voice -->|"recognizes and speaks"| node_speech
node_voice -->|"invokes AI playlist"| node_webapp
node_webapp -->|"requests AI playlist"| node_server
node_server -.->|"requests AI parsing"| node_openai
node_server -->|"queries playlist tracks"| node_mysql
node_roomclient -->|"exchanges room events"| node_server
node_player -->|"broadcasts room playback"| node_server
node_player -->|"updates playback state"| node_mascot

click node_webapp "https://github.com/namhuynh1234kk-blip/melody/blob/main/js/app.js"
click node_page "https://github.com/namhuynh1234kk-blip/melody/blob/main/index.html"
click node_localplaylist "https://github.com/namhuynh1234kk-blip/melody/blob/main/js/data.js"
click node_catalog "https://github.com/namhuynh1234kk-blip/melody/blob/main/js/app.js"
click node_accounts "https://github.com/namhuynh1234kk-blip/melody/blob/main/js/app.js"
click node_player "https://github.com/namhuynh1234kk-blip/melody/blob/main/js/player.js"
click node_visualizer "https://github.com/namhuynh1234kk-blip/melody/blob/main/js/visualizer.js"
click node_voice "https://github.com/namhuynh1234kk-blip/melody/blob/main/js/voice.js"
click node_mascot "https://github.com/namhuynh1234kk-blip/melody/blob/main/js/melody3d.js"
click node_roomclient "https://github.com/namhuynh1234kk-blip/melody/blob/main/js/room.js"
click node_server "https://github.com/namhuynh1234kk-blip/melody/blob/main/server.js"
click node_mysql "https://github.com/namhuynh1234kk-blip/melody/blob/main/database/melodyvn.sql"

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_webapp,node_page,node_localplaylist,node_catalog,node_accounts,node_browseraudio,node_speech toneBlue
class node_player,node_visualizer,node_voice,node_mascot toneAmber
class node_server,node_mysql,node_openai toneMint
class node_roomclient toneRose
class node_listener toneIndigo
```

## Components

### Web listening

- [Web app](https://github.com/namhuynh1234kk-blip/melody/blob/main/js/app.js): `js/app.js`
- [App page](https://github.com/namhuynh1234kk-blip/melody/blob/main/index.html): `index.html`
- [Local playlist](https://github.com/namhuynh1234kk-blip/melody/blob/main/js/data.js): `js/data.js`
- [Catalog and discovery](https://github.com/namhuynh1234kk-blip/melody/blob/main/js/app.js): `js/app.js`
- [Accounts and admin](https://github.com/namhuynh1234kk-blip/melody/blob/main/js/app.js): `js/app.js`

### Playback experience

- [Audio player and queue](https://github.com/namhuynh1234kk-blip/melody/blob/main/js/player.js): `js/player.js`
- [Audio visualizer](https://github.com/namhuynh1234kk-blip/melody/blob/main/js/visualizer.js): `js/visualizer.js`
- [Voice assistant](https://github.com/namhuynh1234kk-blip/melody/blob/main/js/voice.js): `js/voice.js`
- [AI mascot](https://github.com/namhuynh1234kk-blip/melody/blob/main/js/melody3d.js): `js/melody3d.js`

### Backend services

- [API and socket server](https://github.com/namhuynh1234kk-blip/melody/blob/main/server.js): `server.js`
- [MySQL data](https://github.com/namhuynh1234kk-blip/melody/blob/main/database/melodyvn.sql): `database/melodyvn.sql`

### Social listening

- [Room client](https://github.com/namhuynh1234kk-blip/melody/blob/main/js/room.js): `js/room.js`

### Other components

- **Listener**
- **OpenAI API**
- **Browser audio**
- **Browser speech APIs**

## Connections

- Listener → App page: opens
- App page → Web app: loads interface
- Web app → Audio player and queue: initializes
- Web app → Catalog and discovery: requests songs
- Catalog and discovery → API and socket server: fetches catalog
- API and socket server → MySQL data: queries
- Web app → Accounts and admin: requests account actions
- Accounts and admin → API and socket server: calls account APIs
- Web app → Local playlist: loads and saves
- Audio player and queue → Browser audio: plays audio
- Audio visualizer → Browser audio: analyzes playback
- Voice assistant → Browser speech APIs: recognizes and speaks
- Voice assistant → Web app: invokes AI playlist
- Web app → API and socket server: requests AI playlist
- API and socket server → OpenAI API: requests AI parsing
- API and socket server → MySQL data: queries playlist tracks
- Room client → API and socket server: exchanges room events
- Audio player and queue → API and socket server: broadcasts room playback
- Audio player and queue → AI mascot: updates playback state