diff --git a/changelog.md b/changelog.md
index cd7cf4c..66d6bf8 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,15 @@
 # Changelog
 
+## 2025-08-18 - 5.16.4 - fix(classes.doc (convertFilterForMongoDb))
+Improve filter conversion: handle logical operators, merge operator objects, add nested filter tests and docs, and fix test script
+
+- Fix package.json test script: remove stray dot in tstest --verbose argument to ensure tests run correctly
+- Enhance convertFilterForMongoDb in ts/classes.doc.ts to properly handle logical operators ($and, $or, $nor, $not) and return them recursively
+- Merge operator objects for the same field path (e.g. combining $gte and $lte) to avoid overwriting operator clauses when object and dot-notation are mixed
+- Add validation/guards for operator argument types (e.g. $in, $nin, $all must be arrays; $size must be numeric) and preserve existing behavior blocking $where for security
+- Add comprehensive nested filter tests in test/test.filters.ts to cover deep nested object queries, $elemMatch, array size, $all, $in on nested fields and more
+- Expand README filtering section with detailed examples for basic filtering, deep nested filters, comparison operators, array operations, logical and element operators, and advanced patterns
+
 ## 2025-08-18 - 5.16.3 - fix(docs)
 Add local Claude settings and remove outdated codex.md
 
diff --git a/package.json b/package.json
index 4c35c30..43ea964 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   "typings": "dist_ts/index.d.ts",
   "type": "module",
   "scripts": {
-    "test": "tstest test/ --verbose.  --logfile --timeout 120",
+    "test": "tstest test/ --verbose --logfile --timeout 120",
     "testSearch": "tsx test/test.search.ts",
     "build": "tsbuild --web --allowimplicitany",
     "buildDocs": "tsdoc"
diff --git a/readme.md b/readme.md
index c9ad286..770a694 100644
--- a/readme.md
+++ b/readme.md
@@ -144,40 +144,130 @@ await foundUser.delete();
 
 SmartData provides the most advanced type-safe filtering system for MongoDB, supporting all operators while maintaining full IntelliSense:
 
+#### Basic Filtering
+
 ```typescript
+// Simple equality
+const john = await User.getInstances({ name: 'John Doe' });
+
+// Multiple fields (implicit AND)
+const activeAdults = await User.getInstances({
+  status: 'active',
+  age: { $gte: 18 }
+});
+
 // Union types work perfectly
 const users = await User.getInstances({
   status: { $in: ['active', 'pending'] }  // TypeScript validates these values!
 });
+```
 
-// Comparison operators with type checking
+#### Deep Nested Object Filtering
+
+SmartData supports **both** nested object notation and dot notation for querying nested fields, with intelligent merging when both are used:
+
+```typescript
+// Nested object notation - natural TypeScript syntax
+const users = await User.getInstances({
+  metadata: {
+    loginCount: { $gte: 5 }
+  }
+});
+
+// Dot notation - MongoDB style
+const sameUsers = await User.getInstances({
+  'metadata.loginCount': { $gte: 5 }
+});
+
+// POWERFUL: Combine both notations - operators are merged!
+const filtered = await User.getInstances({
+  metadata: { loginCount: { $gte: 3 } },      // Object notation
+  'metadata.loginCount': { $lte: 10 }         // Dot notation
+  // Result: metadata.loginCount between 3 and 10
+});
+
+// Deep nesting with full type safety
+const deepQuery = await User.getInstances({
+  profile: {
+    settings: {
+      notifications: {
+        email: true,
+        frequency: { $in: ['daily', 'weekly'] }
+      }
+    }
+  }
+});
+
+// Mix styles for complex queries
+const advanced = await User.getInstances({
+  // Object notation for structure
+  profile: {
+    age: { $gte: 21 },
+    verified: true
+  },
+  // Dot notation for specific overrides
+  'profile.settings.theme': 'dark',
+  'profile.lastSeen': { $gte: new Date('2024-01-01') }
+});
+```
+
+#### Comparison Operators
+
+```typescript
+// Numeric comparisons with type checking
 const adults = await User.getInstances({
   age: { $gte: 18, $lt: 65 }  // Type-safe numeric comparisons
 });
 
+// Date comparisons
+const recentUsers = await User.getInstances({
+  createdAt: { $gte: new Date('2024-01-01') }
+});
+
+// Not equal
+const nonAdmins = await User.getInstances({
+  role: { $ne: 'admin' }
+});
+```
+
+#### Array Operations
+
+```typescript
 // Array operations with full type safety
 const experts = await User.getInstances({
   tags: { $all: ['typescript', 'mongodb'] },  // Must have all tags
   skills: { $size: 5 }  // Exactly 5 skills
 });
 
-// Complex nested queries
+// Array element matching
+const results = await Order.getInstances({
+  items: { 
+    $elemMatch: {  // Match array elements
+      product: 'laptop',
+      quantity: { $gte: 2 }
+    }
+  }
+});
+
+// Check if value exists in array field
+const nodeUsers = await User.getInstances({
+  skills: { $in: ['nodejs'] }  // Has nodejs in skills array
+});
+```
+
+#### Logical Operators
+
+```typescript
+// Complex nested queries with $and
 const results = await Order.getInstances({
   $and: [
     { status: { $in: ['pending', 'processing'] } },
-    { 'items.price': { $gte: 100 } },  // Dot notation for nested fields
-    { 
-      items: { 
-        $elemMatch: {  // Array element matching
-          product: 'laptop',
-          quantity: { $gte: 2 }
-        }
-      }
-    }
+    { 'items.price': { $gte: 100 } },
+    { customer: { verified: true } }
   ]
 });
 
-// Logical operators
+// $or operator
 const urgentOrHighValue = await Order.getInstances({
   $or: [
     { priority: 'urgent' },
@@ -185,8 +275,94 @@ const urgentOrHighValue = await Order.getInstances({
   ]
 });
 
-// Security: $where is automatically blocked
+// $nor operator - none of the conditions
+const excluded = await User.getInstances({
+  $nor: [
+    { status: 'banned' },
+    { role: 'guest' }
+  ]
+});
+
+// Combine logical operators
+const complex = await Order.getInstances({
+  $and: [
+    { status: 'active' },
+    {
+      $or: [
+        { priority: 'high' },
+        { value: { $gte: 1000 } }
+      ]
+    }
+  ]
+});
+```
+
+#### Element Operators
+
+```typescript
+// Check field existence
+const withEmail = await User.getInstances({
+  email: { $exists: true }
+});
+
+// Check for null or missing nested fields
+const noPreferences = await User.getInstances({
+  'profile.preferences': { $exists: false }
+});
+```
+
+#### Text and Pattern Matching
+
+```typescript
+// Regex patterns
+const gmailUsers = await User.getInstances({
+  email: { $regex: '@gmail\\.com$', $options: 'i' }
+});
+
+// Starts with pattern
+const johnUsers = await User.getInstances({
+  name: { $regex: '^John' }
+});
+```
+
+#### Security Features
+
+```typescript
+// Security: $where is automatically blocked for injection protection
 // await User.getInstances({ $where: '...' });  // ❌ Throws security error
+
+// Invalid operators are caught
+// await User.getInstances({ $badOp: 'value' });  // ⚠️ Warning logged
+```
+
+#### Advanced Patterns
+
+```typescript
+// Combine multiple filtering approaches
+const advancedQuery = await User.getInstances({
+  // Direct field matching
+  status: 'active',
+  
+  // Nested object with operators
+  profile: {
+    age: { $gte: 18, $lte: 65 },
+    verified: true
+  },
+  
+  // Dot notation for deep paths
+  'settings.notifications.email': true,
+  'metadata.lastLogin': { $gte: new Date(Date.now() - 30*24*60*60*1000) },
+  
+  // Array operations
+  roles: { $in: ['admin', 'moderator'] },
+  tags: { $all: ['verified', 'premium'] },
+  
+  // Logical grouping
+  $or: [
+    { 'subscription.plan': 'premium' },
+    { 'subscription.trial': true }
+  ]
+});
 ```
 
 ### 🔎 Powerful Search Engine
diff --git a/test/test.filters.ts b/test/test.filters.ts
index 328d392..01e393a 100644
--- a/test/test.filters.ts
+++ b/test/test.filters.ts
@@ -213,6 +213,221 @@ tap.test('should filter by nested object fields', async () => {
   expect(users[0].name).toEqual('John Doe');
 });
 
+// ============= COMPREHENSIVE NESTED FILTER TESTS =============
+tap.test('should filter by nested object with direct object syntax', async () => {
+  // Direct nested object matching (exact match)
+  const users = await TestUser.getInstances({
+    metadata: { 
+      loginCount: 5,
+      lastLogin: (await TestUser.getInstances({}))[0].metadata.lastLogin // Get the exact date
+    }
+  });
+  expect(users.length).toEqual(1);
+  expect(users[0].name).toEqual('John Doe');
+});
+
+tap.test('should filter by partial nested object match', async () => {
+  // When using object syntax, only specified fields must match
+  const users = await TestUser.getInstances({
+    metadata: { loginCount: 5 }  // Only checks loginCount, ignores other fields
+  });
+  expect(users.length).toEqual(1);
+  expect(users[0].name).toEqual('John Doe');
+});
+
+tap.test('should combine nested object and dot notation', async () => {
+  const users = await TestUser.getInstances({
+    metadata: { loginCount: { $gte: 3 } },  // Object syntax with operator
+    'metadata.loginCount': { $lte: 10 }     // Dot notation with operator
+  });
+  expect(users.length).toEqual(3);  // Jane (3), John (5), and Alice (10) have loginCount between 3-10
+});
+
+tap.test('should filter nested fields with operators using dot notation', async () => {
+  const users = await TestUser.getInstances({
+    'metadata.loginCount': { $gte: 5 }
+  });
+  expect(users.length).toEqual(2);  // John (5) and Alice (10)
+  const names = users.map(u => u.name).sort();
+  expect(names).toEqual(['Alice Brown', 'John Doe']);
+});
+
+tap.test('should filter nested fields with multiple operators', async () => {
+  const users = await TestUser.getInstances({
+    'metadata.loginCount': { $gte: 3, $lt: 10 }
+  });
+  expect(users.length).toEqual(2);  // Jane (3) and John (5)
+  const names = users.map(u => u.name).sort();
+  expect(names).toEqual(['Jane Smith', 'John Doe']);
+});
+
+tap.test('should handle deeply nested object structures', async () => {
+  // First, create a user with deep nesting in preferences
+  const deepUser = new TestUser({
+    name: 'Deep Nester',
+    age: 40,
+    email: 'deep@example.com',
+    roles: ['admin'],
+    tags: [],
+    status: 'active',
+    metadata: {
+      loginCount: 1,
+      preferences: {
+        theme: {
+          colors: {
+            primary: '#000000',
+            secondary: '#ffffff'
+          },
+          fonts: {
+            heading: 'Arial',
+            body: 'Helvetica'
+          }
+        },
+        notifications: {
+          email: true,
+          push: false
+        }
+      }
+    },
+    scores: []
+  });
+  await deepUser.save();
+
+  // Test deep nesting with dot notation
+  const deepResults = await TestUser.getInstances({
+    'metadata.preferences.theme.colors.primary': '#000000'
+  });
+  expect(deepResults.length).toEqual(1);
+  expect(deepResults[0].name).toEqual('Deep Nester');
+
+  // Test deep nesting with operators
+  const boolResults = await TestUser.getInstances({
+    'metadata.preferences.notifications.email': { $eq: true }
+  });
+  expect(boolResults.length).toEqual(1);
+  expect(boolResults[0].name).toEqual('Deep Nester');
+
+  // Clean up
+  await deepUser.delete();
+});
+
+tap.test('should filter arrays of nested objects using $elemMatch', async () => {
+  const orders = await TestOrder.getInstances({
+    items: {
+      $elemMatch: {
+        product: 'laptop',
+        price: { $gte: 1000 }
+      }
+    }
+  });
+  expect(orders.length).toEqual(2);  // Both laptop orders have price >= 1000
+});
+
+tap.test('should filter nested arrays with dot notation', async () => {
+  // Query for any order that has an item with specific product
+  const orders = await TestOrder.getInstances({
+    'items.product': 'laptop'
+  });
+  expect(orders.length).toEqual(2);  // Two orders contain laptops
+});
+
+tap.test('should combine nested object filters with logical operators', async () => {
+  const users = await TestUser.getInstances({
+    $or: [
+      { 'metadata.loginCount': { $gte: 10 } },  // Alice has 10
+      { 
+        $and: [
+          { 'metadata.loginCount': { $lt: 5 } },  // Jane has 3, Bob has 0, Charlie has 1
+          { status: 'active' }  // Jane is active, Bob is inactive, Charlie is pending
+        ]
+      }
+    ]
+  });
+  expect(users.length).toEqual(2);  // Alice (loginCount >= 10), Jane (loginCount < 5 AND active)
+  const names = users.map(u => u.name).sort();
+  expect(names).toEqual(['Alice Brown', 'Jane Smith']);
+});
+
+tap.test('should handle null and undefined in nested fields', async () => {
+  // Users without lastLogin
+  const noLastLogin = await TestUser.getInstances({
+    'metadata.lastLogin': { $exists: false }
+  });
+  expect(noLastLogin.length).toEqual(4);  // Everyone except John
+
+  // Users with preferences (none have it set)
+  const withPreferences = await TestUser.getInstances({
+    'metadata.preferences': { $exists: true }
+  });
+  expect(withPreferences.length).toEqual(0);
+});
+
+tap.test('should filter nested arrays by size', async () => {
+  // Create an order with specific number of items
+  const multiItemOrder = new TestOrder({
+    userId: 'test-user',
+    items: [
+      { product: 'item1', quantity: 1, price: 10 },
+      { product: 'item2', quantity: 2, price: 20 },
+      { product: 'item3', quantity: 3, price: 30 },
+      { product: 'item4', quantity: 4, price: 40 }
+    ],
+    totalAmount: 100,
+    status: 'pending',
+    tags: ['test']
+  });
+  await multiItemOrder.save();
+
+  const fourItemOrders = await TestOrder.getInstances({
+    items: { $size: 4 }
+  });
+  expect(fourItemOrders.length).toEqual(1);
+
+  // Clean up
+  await multiItemOrder.delete();
+});
+
+tap.test('should handle nested field comparison between documents', async () => {
+  // Find users where loginCount equals their age divided by 6 (John: 30/6=5)
+  const users = await TestUser.getInstances({
+    $and: [
+      { 'metadata.loginCount': 5 },
+      { age: 30 }
+    ]
+  });
+  expect(users.length).toEqual(1);
+  expect(users[0].name).toEqual('John Doe');
+});
+
+tap.test('should filter using $in on nested fields', async () => {
+  const users = await TestUser.getInstances({
+    'metadata.loginCount': { $in: [0, 1, 5] }
+  });
+  expect(users.length).toEqual(3);  // Bob (0), Charlie (1), John (5)
+  const names = users.map(u => u.name).sort();
+  expect(names).toEqual(['Bob Johnson', 'Charlie Wilson', 'John Doe']);
+});
+
+tap.test('should filter nested arrays with $all', async () => {
+  // Create an order with multiple tags
+  const taggedOrder = new TestOrder({
+    userId: 'test-user',
+    items: [{ product: 'test', quantity: 1, price: 10 }],
+    totalAmount: 10,
+    status: 'completed',
+    tags: ['urgent', 'priority', 'electronics']
+  });
+  await taggedOrder.save();
+
+  const priorityElectronics = await TestOrder.getInstances({
+    tags: { $all: ['priority', 'electronics'] }
+  });
+  expect(priorityElectronics.length).toEqual(2);  // Original order and new one
+
+  // Clean up
+  await taggedOrder.delete();
+});
+
 // ============= COMPARISON OPERATOR TESTS =============
 tap.test('should filter using $gt operator', async () => {
   const users = await TestUser.getInstances({
diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index 8a1380c..cfff9b8 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartdata',
-  version: '5.16.3',
+  version: '5.16.4',
   description: 'An advanced library for NoSQL data organization and manipulation using TypeScript with support for MongoDB, data validation, collections, and custom data types.'
 }
diff --git a/ts/classes.doc.ts b/ts/classes.doc.ts
index 1edf03c..b008b0c 100644
--- a/ts/classes.doc.ts
+++ b/ts/classes.doc.ts
@@ -199,21 +199,51 @@ export const convertFilterForMongoDb = (filterArg: { [key: string]: any }) => {
     throw new Error('$where operator is not allowed for security reasons');
   }
   
-  // Special case: detect MongoDB operators and pass them through directly
-  const topLevelOperators = ['$and', '$or', '$nor', '$not', '$text', '$regex'];
+  // Handle logical operators recursively
+  const logicalOperators = ['$and', '$or', '$nor', '$not'];
+  const processedFilter: { [key: string]: any } = {};
+  
   for (const key of Object.keys(filterArg)) {
-    if (topLevelOperators.includes(key)) {
-      return filterArg; // Return the filter as-is for MongoDB operators
+    if (logicalOperators.includes(key)) {
+      if (key === '$not') {
+        processedFilter[key] = convertFilterForMongoDb(filterArg[key]);
+      } else if (Array.isArray(filterArg[key])) {
+        processedFilter[key] = filterArg[key].map((subFilter: any) => convertFilterForMongoDb(subFilter));
+      }
     }
   }
+  
+  // If only logical operators, return them
+  const hasOnlyLogicalOperators = Object.keys(filterArg).every(key => logicalOperators.includes(key));
+  if (hasOnlyLogicalOperators) {
+    return processedFilter;
+  }
 
   // Original conversion logic for non-MongoDB query objects
   const convertedFilter: { [key: string]: any } = {};
+  
+  // Helper to merge operator objects
+  const mergeIntoConverted = (path: string, value: any) => {
+    const existing = convertedFilter[path];
+    if (!existing) {
+      convertedFilter[path] = value;
+    } else if (
+      typeof existing === 'object' && !Array.isArray(existing) &&
+      typeof value === 'object' && !Array.isArray(value) &&
+      (Object.keys(existing).some(k => k.startsWith('$')) || Object.keys(value).some(k => k.startsWith('$')))
+    ) {
+      // Both have operators, merge them
+      convertedFilter[path] = { ...existing, ...value };
+    } else {
+      // Otherwise later wins
+      convertedFilter[path] = value;
+    }
+  };
 
   const convertFilterArgument = (keyPathArg2: string, filterArg2: any) => {
     if (Array.isArray(filterArg2)) {
       // Arrays are typically used as values for operators like $in or as direct equality matches
-      convertedFilter[keyPathArg2] = filterArg2;
+      mergeIntoConverted(keyPathArg2, filterArg2);
       return;
     } else if (typeof filterArg2 === 'object' && filterArg2 !== null) {
       // Check if this is an object with MongoDB operators
@@ -264,8 +294,8 @@ export const convertFilterForMongoDb = (filterArg: { [key: string]: any }) => {
           throw new Error('$size operator requires a numeric value');
         }
         
-        // Pass the operator object through
-        convertedFilter[keyPathArg2] = filterArg2;
+        // Use merge helper to handle duplicate paths
+        mergeIntoConverted(keyPathArg2, filterArg2);
         return;
       }
       
@@ -282,13 +312,20 @@ export const convertFilterForMongoDb = (filterArg: { [key: string]: any }) => {
       }
     } else {
       // Primitive values
-      convertedFilter[keyPathArg2] = filterArg2;
+      mergeIntoConverted(keyPathArg2, filterArg2);
     }
   };
 
   for (const key of Object.keys(filterArg)) {
-    convertFilterArgument(key, filterArg[key]);
+    // Skip logical operators, they were already processed
+    if (!logicalOperators.includes(key)) {
+      convertFilterArgument(key, filterArg[key]);
+    }
   }
+  
+  // Add back processed logical operators
+  Object.assign(convertedFilter, processedFilter);
+  
   return convertedFilter;
 };