# shyam640/auths architecture

> Architecture diagram of the GitHub repository shyam640/auths, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-11-10). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/shyam640/auths
- Repository: https://github.com/shyam640/auths

## Overview

This repository combines a React/Firebase authentication UI with an Express/Mongoose auth API. The visible UI workflow is signup or login (including Google sign-in), then protected home and logout; the API separately implements password-based signup/signin and email confirmation. The API persists users and sends confirmation mail. The source excerpts show the frontend’s Firebase calls and the backend’s route/controller wiring, but do not establish that the frontend calls the backend API; the two flows are therefore shown separately.

Main entry points: [`frontend/src/context/UserAuthContext.js`](https://github.com/shyam640/auths/blob/main/frontend/src/context/UserAuthContext.js) (Auth context), [`frontend/src/App.js`](https://github.com/shyam640/auths/blob/main/frontend/src/App.js) (App routing), [`frontend/src/components/ProtectedRoute.js`](https://github.com/shyam640/auths/blob/main/frontend/src/components/ProtectedRoute.js) (Protected route), [`backend/controllers/auth.js`](https://github.com/shyam640/auths/blob/main/backend/controllers/auth.js) (Auth operations)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_frontend["Frontend experience"]
  node_app["App routing<br/>[App.js]"]
  node_login["Login and Google<br/>[Login.js]"]
  node_signup["Signup form<br/>[Signup.js]"]
  node_guard["Protected route<br/>[ProtectedRoute.js]"]
  node_home["Home and logout<br/>[Home.js]"]
end

subgraph group_firebase["Firebase authentication"]
  node_auth_context["Auth context<br/>[UserAuthContext.js]"]
  node_firebase_config["Firebase setup<br/>[firebase.js]"]
end

subgraph group_backend["Backend auth API"]
  node_api_entry["API server<br/>[index.js]"]
  node_auth_routes["Auth routes<br/>[auth.js]"]
  node_auth_controller["Auth operations<br/>[auth.js]"]
  node_auth_middleware["Auth middleware<br/>[auth.js]"]
end

subgraph group_persistence["User persistence"]
  node_user_model["User model<br/>[user.js]"]
  node_mongo[("MongoDB")]
end

subgraph group_email["Email confirmation"]
  node_mailer["Confirmation mailer"]
end

node_visitor(("Visitor"))
node_firebase_auth["Firebase Auth"]
node_gmail["Gmail"]

node_visitor -->|"opens"| node_app
node_app -->|"routes to"| node_login
node_app -->|"routes to"| node_signup
node_app -->|"wraps home"| node_guard
node_guard -->|"renders"| node_home
node_login -->|"uses"| node_auth_context
node_signup -->|"uses"| node_auth_context
node_home -->|"uses"| node_auth_context
node_guard -->|"checks user"| node_auth_context
node_auth_context -->|"imports auth"| node_firebase_config
node_auth_context -->|"calls"| node_firebase_auth
node_firebase_config -->|"initializes"| node_firebase_auth
node_api_entry -->|"mounts"| node_auth_routes
node_auth_routes -->|"dispatches"| node_auth_controller
node_auth_controller -->|"queries and updates"| node_user_model
node_api_entry -->|"connects"| node_mongo
node_auth_controller -->|"sends confirmation"| node_mailer
node_mailer -->|"sends mail"| node_gmail

click node_app "https://github.com/shyam640/auths/blob/main/frontend/src/App.js"
click node_login "https://github.com/shyam640/auths/blob/main/frontend/src/components/Login.js"
click node_signup "https://github.com/shyam640/auths/blob/main/frontend/src/components/Signup.js"
click node_guard "https://github.com/shyam640/auths/blob/main/frontend/src/components/ProtectedRoute.js"
click node_home "https://github.com/shyam640/auths/blob/main/frontend/src/components/Home.js"
click node_auth_context "https://github.com/shyam640/auths/blob/main/frontend/src/context/UserAuthContext.js"
click node_firebase_config "https://github.com/shyam640/auths/blob/main/frontend/src/firebase.js"
click node_api_entry "https://github.com/shyam640/auths/blob/main/backend/index.js"
click node_auth_routes "https://github.com/shyam640/auths/blob/main/backend/routes/auth.js"
click node_auth_controller "https://github.com/shyam640/auths/blob/main/backend/controllers/auth.js"
click node_auth_middleware "https://github.com/shyam640/auths/blob/main/backend/middleware/auth.js"
click node_user_model "https://github.com/shyam640/auths/blob/main/backend/models/user.js"
click node_mailer "https://github.com/shyam640/auths/blob/main/backend/config/nodemailer.config.js"

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_login,node_signup,node_guard,node_home toneBlue
class node_auth_context,node_firebase_config toneAmber
class node_api_entry,node_auth_routes,node_auth_controller,node_auth_middleware toneMint
class node_user_model,node_mongo toneRose
class node_mailer,node_visitor,node_firebase_auth,node_gmail toneIndigo
```

## Components

### Frontend experience

- [App routing](https://github.com/shyam640/auths/blob/main/frontend/src/App.js): `frontend/src/App.js`
- [Login and Google](https://github.com/shyam640/auths/blob/main/frontend/src/components/Login.js): `frontend/src/components/Login.js`
- [Signup form](https://github.com/shyam640/auths/blob/main/frontend/src/components/Signup.js): `frontend/src/components/Signup.js`
- [Protected route](https://github.com/shyam640/auths/blob/main/frontend/src/components/ProtectedRoute.js): `frontend/src/components/ProtectedRoute.js`
- [Home and logout](https://github.com/shyam640/auths/blob/main/frontend/src/components/Home.js): `frontend/src/components/Home.js`

### Firebase authentication

- [Auth context](https://github.com/shyam640/auths/blob/main/frontend/src/context/UserAuthContext.js): `frontend/src/context/UserAuthContext.js`
- [Firebase setup](https://github.com/shyam640/auths/blob/main/frontend/src/firebase.js): `frontend/src/firebase.js`

### Backend auth API

- [API server](https://github.com/shyam640/auths/blob/main/backend/index.js): `backend/index.js`
- [Auth routes](https://github.com/shyam640/auths/blob/main/backend/routes/auth.js): `backend/routes/auth.js`
- [Auth operations](https://github.com/shyam640/auths/blob/main/backend/controllers/auth.js): `backend/controllers/auth.js`
- [Auth middleware](https://github.com/shyam640/auths/blob/main/backend/middleware/auth.js): `backend/middleware/auth.js`

### User persistence

- [User model](https://github.com/shyam640/auths/blob/main/backend/models/user.js): `backend/models/user.js`
- **MongoDB**

### Email confirmation

- [Confirmation mailer](https://github.com/shyam640/auths/blob/main/backend/config/nodemailer.config.js): `backend/config/nodemailer.config.js`

### Other components

- **Visitor**
- **Firebase Auth**
- **Gmail**

## Connections

- Visitor → App routing: opens (evidence: `frontend/src/App.js`)
- App routing → Login and Google: routes to (evidence: `frontend/src/App.js`)
- App routing → Signup form: routes to (evidence: `frontend/src/App.js`)
- App routing → Protected route: wraps home (evidence: `frontend/src/App.js`)
- Protected route → Home and logout: renders (evidence: `frontend/src/App.js`)
- Login and Google → Auth context: uses (evidence: `frontend/src/components/Login.js`)
- Signup form → Auth context: uses (evidence: `frontend/src/components/Signup.js`)
- Home and logout → Auth context: uses (evidence: `frontend/src/components/Home.js`)
- Protected route → Auth context: checks user (evidence: `frontend/src/components/ProtectedRoute.js`)
- Auth context → Firebase setup: imports auth (evidence: `frontend/src/context/UserAuthContext.js`)
- Auth context → Firebase Auth: calls (evidence: `frontend/src/context/UserAuthContext.js`)
- Firebase setup → Firebase Auth: initializes (evidence: `frontend/src/firebase.js`)
- API server → Auth routes: mounts (evidence: `backend/index.js`)
- Auth routes → Auth operations: dispatches (evidence: `backend/routes/auth.js`)
- Auth operations → User model: queries and updates (evidence: `backend/controllers/auth.js`)
- API server → MongoDB: connects (evidence: `backend/index.js`)
- Auth operations → Confirmation mailer: sends confirmation (evidence: `backend/controllers/auth.js`)
- Confirmation mailer → Gmail: sends mail (evidence: `backend/config/nodemailer.config.js`)