Personal Expense Tracker (On-chain)

A simple on-chain expense tracker that allows users to record their expenses and view only their own total expense.

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This project is fully build by me (MOHD SHARIQ).

Features

• Users can add expenses with amount and note
• Each user has a private expense ledger
• Users can view only their own total expense
• Expense data of other users is not accessible
• Emits an event on every expense addition

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Smart Contract

• Written in Solidity
• Uses struct, mapping, and msg.sender
• Expense data is stored per user
• Mapping is private to prevent direct access

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Events

• ExpenseAdded(address user, uint256 amount, string note)
• Emitted whenever a user adds an expense

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Testing

• Tests written using Foundry
• Covers:
  • Single expense addition
  • Multiple expenses for one user
  • Multi-user data isolation
  • Event emission

Run tests using:

forge test -vvvv