# kumarjesh/expenses-tracker architecture

> Architecture diagram of the GitHub repository kumarjesh/expenses-tracker, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-28). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/kumarjesh/expenses-tracker
- Repository: https://github.com/kumarjesh/expenses-tracker

## Overview

Expense Tracker is a browser-based finance app. The main workflow is authentication state selection, then a signed-in dashboard that loads date-filtered transactions and presents ledger, home, and budget views; users can add or delete transactions, export the ledger, and create budgets. Theme preference is managed separately. The README is boilerplate; Login and HomeTab are present in the tree but their implementations were not sampled, so their internal behavior and wiring are not inferred.

Main entry points: [`src/components/Dashboard.tsx`](https://github.com/kumarjesh/expenses-tracker/blob/main/src/components/Dashboard.tsx) (Dashboard), [`src/app/page.tsx`](https://github.com/kumarjesh/expenses-tracker/blob/main/src/app/page.tsx) (App entry), [`src/contexts/AuthContext.tsx`](https://github.com/kumarjesh/expenses-tracker/blob/main/src/contexts/AuthContext.tsx) (Auth state), [`src/components/Ledger.tsx`](https://github.com/kumarjesh/expenses-tracker/blob/main/src/components/Ledger.tsx) (Transaction ledger)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_shell["App shell"]
  node_layout["Root layout<br/>[layout.tsx]"]
  node_page["App entry<br/>[page.tsx]"]
end

subgraph group_finance["Finance workflows"]
  node_dashboard["Dashboard<br/>[Dashboard.tsx]"]
  node_ledger["Transaction ledger<br/>[Ledger.tsx]"]
  node_home["Home summary<br/>[HomeTab.tsx]"]
  node_budgets["Budget view<br/>[BudgetsTab.tsx]"]
  node_expenseform["Transaction form<br/>[ExpenseForm.tsx]"]
  node_firestore[("Cloud Firestore")]
end

subgraph group_identity["Identity and preferences"]
  node_login["Login view<br/>[Login.tsx]"]
  node_authcontext["Auth state<br/>[AuthContext.tsx]"]
  node_themecontext["Theme state<br/>[ThemeContext.tsx]"]
  node_firebaseconfig["Firebase setup<br/>[firebase.ts]"]
  node_firebaseauth["Firebase Auth"]
  node_localstorage[("Browser storage")]
end

node_user(("User"))
node_browser(("Browser"))

node_user -->|"opens app"| node_page
node_layout -->|"wraps"| node_themecontext
node_layout -->|"wraps"| node_authcontext
node_page -->|"reads state"| node_authcontext
node_page -->|"shows signed-in"| node_dashboard
node_page -->|"shows signed-out"| node_login
node_authcontext -->|"uses auth"| node_firebaseconfig
node_firebaseconfig -->|"initializes"| node_firebaseauth
node_authcontext -->|"observes session"| node_firebaseauth
node_dashboard -->|"queries and deletes"| node_firestore
node_dashboard -->|"supplies transactions"| node_ledger
node_dashboard -->|"supplies transactions"| node_home
node_dashboard -->|"supplies expenses"| node_budgets
node_dashboard -->|"opens form"| node_expenseform
node_expenseform -->|"adds transaction"| node_firestore
node_budgets -->|"reads and adds budgets"| node_firestore
node_ledger -->|"downloads CSV"| node_browser
node_ledger -->|"updates date range"| node_dashboard
node_dashboard -->|"signs out"| node_firebaseauth
node_themecontext -->|"reads and saves theme"| node_localstorage
node_themecontext -->|"sets document theme"| node_browser

click node_layout "https://github.com/kumarjesh/expenses-tracker/blob/main/src/app/layout.tsx"
click node_page "https://github.com/kumarjesh/expenses-tracker/blob/main/src/app/page.tsx"
click node_dashboard "https://github.com/kumarjesh/expenses-tracker/blob/main/src/components/Dashboard.tsx"
click node_login "https://github.com/kumarjesh/expenses-tracker/blob/main/src/components/Login.tsx"
click node_ledger "https://github.com/kumarjesh/expenses-tracker/blob/main/src/components/Ledger.tsx"
click node_home "https://github.com/kumarjesh/expenses-tracker/blob/main/src/components/HomeTab.tsx"
click node_budgets "https://github.com/kumarjesh/expenses-tracker/blob/main/src/components/BudgetsTab.tsx"
click node_expenseform "https://github.com/kumarjesh/expenses-tracker/blob/main/src/components/ExpenseForm.tsx"
click node_authcontext "https://github.com/kumarjesh/expenses-tracker/blob/main/src/contexts/AuthContext.tsx"
click node_themecontext "https://github.com/kumarjesh/expenses-tracker/blob/main/src/contexts/ThemeContext.tsx"
click node_firebaseconfig "https://github.com/kumarjesh/expenses-tracker/blob/main/src/lib/firebase.ts"

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_layout,node_page,node_user,node_browser toneBlue
class node_dashboard,node_ledger,node_home,node_budgets,node_expenseform,node_firestore toneAmber
class node_login,node_authcontext,node_themecontext,node_firebaseconfig,node_firebaseauth,node_localstorage toneMint
```

## Components

### App shell

- [Root layout](https://github.com/kumarjesh/expenses-tracker/blob/main/src/app/layout.tsx): `src/app/layout.tsx`
- [App entry](https://github.com/kumarjesh/expenses-tracker/blob/main/src/app/page.tsx): `src/app/page.tsx`

### Finance workflows

- [Dashboard](https://github.com/kumarjesh/expenses-tracker/blob/main/src/components/Dashboard.tsx): `src/components/Dashboard.tsx`
- [Transaction ledger](https://github.com/kumarjesh/expenses-tracker/blob/main/src/components/Ledger.tsx): `src/components/Ledger.tsx`
- [Home summary](https://github.com/kumarjesh/expenses-tracker/blob/main/src/components/HomeTab.tsx): `src/components/HomeTab.tsx`
- [Budget view](https://github.com/kumarjesh/expenses-tracker/blob/main/src/components/BudgetsTab.tsx): `src/components/BudgetsTab.tsx`
- [Transaction form](https://github.com/kumarjesh/expenses-tracker/blob/main/src/components/ExpenseForm.tsx): `src/components/ExpenseForm.tsx`
- **Cloud Firestore**

### Identity and preferences

- [Login view](https://github.com/kumarjesh/expenses-tracker/blob/main/src/components/Login.tsx): `src/components/Login.tsx`
- [Auth state](https://github.com/kumarjesh/expenses-tracker/blob/main/src/contexts/AuthContext.tsx): `src/contexts/AuthContext.tsx`
- [Theme state](https://github.com/kumarjesh/expenses-tracker/blob/main/src/contexts/ThemeContext.tsx): `src/contexts/ThemeContext.tsx`
- [Firebase setup](https://github.com/kumarjesh/expenses-tracker/blob/main/src/lib/firebase.ts): `src/lib/firebase.ts`
- **Firebase Auth**
- **Browser storage**

### Other components

- **User**
- **Browser**

## Connections

- User → App entry: opens app
- Root layout → Theme state: wraps
- Root layout → Auth state: wraps
- App entry → Auth state: reads state
- App entry → Dashboard: shows signed-in
- App entry → Login view: shows signed-out
- Auth state → Firebase setup: uses auth
- Firebase setup → Firebase Auth: initializes
- Auth state → Firebase Auth: observes session
- Dashboard → Cloud Firestore: queries and deletes
- Dashboard → Transaction ledger: supplies transactions
- Dashboard → Home summary: supplies transactions
- Dashboard → Budget view: supplies expenses
- Dashboard → Transaction form: opens form
- Transaction form → Cloud Firestore: adds transaction
- Budget view → Cloud Firestore: reads and adds budgets
- Transaction ledger → Browser: downloads CSV
- Transaction ledger → Dashboard: updates date range
- Dashboard → Firebase Auth: signs out
- Theme state → Browser storage: reads and saves theme
- Theme state → Browser: sets document theme