diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..3cbc8b1
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,13 @@
+# .editorconfig
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 2b76d7c..9395df8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -156,3 +156,6 @@ dist
 vite.config.js.timestamp-*
 vite.config.ts.timestamp-*
 
+# node modules
+node_modules/
+
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 0000000..1c49d82
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1,5 @@
+node_modules/
+package-lock.json
+dist/
+build/
+*.min.js
\ No newline at end of file
diff --git a/.prettierrc b/.prettierrc
new file mode 100644
index 0000000..85fd947
--- /dev/null
+++ b/.prettierrc
@@ -0,0 +1,8 @@
+{
+  "semi": true,
+  "trailingComma": "es5",
+  "singleQuote": true,
+  "printWidth": 80,
+  "tabWidth": 2,
+  "useTabs": false
+}
diff --git a/README.md b/README.md
index 2de48c5..f0e2ccf 100644
--- a/README.md
+++ b/README.md
@@ -5,3 +5,4 @@ The week 4 assignment for the HackYourFuture Core program can be found at the fo
 - Implement the requirements in the `finance-tracker` folder. 
 - Use the existing file structure. 
 - You are allowed to create additional files if needed.
+console.log asdsd
\ No newline at end of file
diff --git a/finance-tracker/app.js b/finance-tracker/app.js
index 7cfcd07..8765df1 100644
--- a/finance-tracker/app.js
+++ b/finance-tracker/app.js
@@ -1,3 +1,5 @@
-// This is the entrypoint for your application.
-// node app.js
+const { printAllTransactions, printSummary } = require('./finance');
 
+printAllTransactions();
+
+printSummary();
diff --git a/finance-tracker/data.js b/finance-tracker/data.js
index d7863ff..2db6c82 100644
--- a/finance-tracker/data.js
+++ b/finance-tracker/data.js
@@ -1,2 +1,44 @@
-// Place here the transaction data array. Use it in your application as needed.
-const transactions = [];
\ No newline at end of file
+const transactions = [
+  {
+    id: 1,
+    type: 'income',
+    category: 'salary',
+    amount: 3000,
+    description: 'Salary',
+    date: '2025-01-15',
+  },
+  {
+    id: 2,
+    type: 'expense',
+    category: 'housing',
+    amount: 1200,
+    description: 'Rent',
+    date: '2025-01-20',
+  },
+  {
+    id: 3,
+    type: 'expense',
+    category: 'food',
+    amount: 300,
+    description: 'Groceries',
+    date: '2025-01-22',
+  },
+  {
+    id: 4,
+    type: 'income',
+    category: 'side-income',
+    amount: 500,
+    description: 'Freelance',
+    date: '2025-01-25',
+  },
+  {
+    id: 5,
+    type: 'expense',
+    category: 'bills',
+    amount: 150,
+    description: 'Utilities',
+    date: '2025-01-28',
+  },
+];
+
+module.exports = transactions;
diff --git a/finance-tracker/finance.js b/finance-tracker/finance.js
index ac2118f..25d7a7a 100644
--- a/finance-tracker/finance.js
+++ b/finance-tracker/finance.js
@@ -1,27 +1,87 @@
-function addTransaction(transaction) {
-  // TODO: Implement this function
+const transactions = require('./data');
+const chalk = require('chalk');
+
+function addTransaction(newTransaction) {
+  transactions.push({ ...newTransaction });
 }
 
 function getTotalIncome() {
-  // TODO: Implement this function
+  let sum = 0;
+  for (const t of transactions) {
+    if (t.type === 'income') {
+      sum += t.amount;
+    }
+  }
+  return sum;
 }
 
 function getTotalExpenses() {
-  // TODO: Implement this function
+  let sum = 0;
+  for (const t of transactions) {
+    if (t.type === 'expense') {
+      sum += t.amount;
+    }
+  }
+  return sum;
 }
 
 function getBalance() {
-  // TODO: Implement this function
+  return getTotalIncome() - getTotalExpenses();
 }
 
 function getTransactionsByCategory(category) {
-  // TODO: Implement this function
+  let filtered = [];
+  for (const t of transactions) {
+    if (t.category === category) {
+      filtered.push(t);
+    }
+  }
+  return filtered;
 }
 
 function getLargestExpense() {
-  // TODO: Implement this function
+  let largest = { amount: 0, description: 'None' };
+  for (const t of transactions) {
+    if (t.type === 'expense' && t.amount > largest.amount) {
+      largest = t;
+    }
+  }
+  return largest;
 }
 
 function printAllTransactions() {
-  // TODO: Implement this function
-}
\ No newline at end of file
+  console.log(chalk.bold.yellow('\n💰 PERSONAL FINANCE TRACKER 💰'));
+  console.log('\nAll Transactions:');
+
+  transactions.forEach((t, index) => {
+    const { type, description, amount, category } = t;
+
+    const label =
+      type === 'income' ? chalk.green('[INCOME]') : chalk.red('[EXPENSE]');
+    const categoryStyled = chalk.yellow(category);
+
+    console.log(
+      `${index + 1}. ${label} ${description} - €${amount} (${categoryStyled})`
+    );
+  });
+}
+
+function printSummary() {
+  const balance = getBalance();
+  const balanceColor = balance >= 0 ? chalk.cyan : chalk.red;
+
+  console.log(chalk.bold('\n📊 FINANCIAL SUMMARY 📊'));
+  console.log(`Total Income: ${chalk.green('€' + getTotalIncome())}`);
+  console.log(`Total Expenses: ${chalk.red('€' + getTotalExpenses())}`);
+  console.log(`Current Balance: ${balanceColor('€' + balance)}`);
+
+  const largest = getLargestExpense();
+  console.log(`\nLargest Expense: ${largest.description} (€${largest.amount})`);
+  console.log(`Total Transactions: ${transactions.length}\n`);
+}
+
+module.exports = {
+  addTransaction,
+  printAllTransactions,
+  printSummary,
+};
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..52239c6
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,86 @@
+{
+  "name": "c55-core-week-4",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "c55-core-week-4",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "chalk": "^4.1.2"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+      "license": "MIT",
+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/chalk": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.1.0",
+        "supports-color": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    },
+    "node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+      "license": "MIT",
+      "dependencies": {
+        "color-name": "~1.1.4"
+      },
+      "engines": {
+        "node": ">=7.0.0"
+      }
+    },
+    "node_modules/color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+      "license": "MIT"
+    },
+    "node_modules/has-flag": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
+      "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+      "license": "MIT",
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..3dee2d3
--- /dev/null
+++ b/package.json
@@ -0,0 +1,25 @@
+{
+  "name": "c55-core-week-4",
+  "version": "1.0.0",
+  "description": "The week 4 assignment for the HackYourFuture Core program can be found at the following link: https://hub.hackyourfuture.nl/core-program-week-4-assignment",
+  "main": "app.js",
+  "scripts": {
+    "format": "prettier --write .",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/noneeeed/c55-core-week-4.git"
+  },
+  "keywords": [],
+  "author": "Bader",
+  "license": "ISC",
+  "type": "commonjs",
+  "bugs": {
+    "url": "https://github.com/noneeeed/c55-core-week-4/issues"
+  },
+  "homepage": "https://github.com/noneeeed/c55-core-week-4#readme",
+  "dependencies": {
+    "chalk": "^4.1.2"
+  }
+}