diff --git a/SONAR_ISSUES_SUMMARY.md b/SONAR_ISSUES_SUMMARY.md
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+# Sonar Code Quality Issues Summary
+
+This document summarizes the 13 distinct Sonar code quality issues that have been intentionally generated in the repository for testing purposes.
+
+## Files Created
+
+- `lib/sonar-issues.ts` - Contains 10 primary Sonar issues
+- `routes/sonar-test.ts` - Contains 3 additional Sonar issues
+
+## Issue Categories and Examples
+
+### 1. Code Smells (9 issues)
+
+#### **Unused Imports/Variables** (Issues #1, #2)
+- **Location**: `lib/sonar-issues.ts:13, 16`
+- **Severity**: Major/Minor
+- **Description**: Unused `path` import and `UNUSED_CONSTANT` variable
+- **Sonar Rule**: typescript:S1481, typescript:S1128
+
+#### **Too Many Parameters** (Issue #4)
+- **Location**: `lib/sonar-issues.ts:23-33`
+- **Severity**: Major
+- **Description**: Function with 10 parameters exceeds recommended limit
+- **Sonar Rule**: typescript:S107
+
+#### **High Cognitive Complexity** (Issue #5)
+- **Location**: `lib/sonar-issues.ts:39-81`
+- **Severity**: Critical
+- **Description**: Deeply nested conditional logic with high complexity
+- **Sonar Rule**: typescript:S3776
+
+#### **Dead/Unreachable Code** (Issue #8)
+- **Location**: `lib/sonar-issues.ts:101-102`
+- **Severity**: Major
+- **Description**: Code after return statement is unreachable
+- **Sonar Rule**: typescript:S1763
+
+#### **Duplicate Code Blocks** (Issue #9)
+- **Location**: `lib/sonar-issues.ts:106-137`
+- **Severity**: Major
+- **Description**: Identical validation logic in two functions
+- **Sonar Rule**: typescript:S4144
+
+#### **Empty Catch Block**
+- **Location**: `routes/sonar-test.ts:23-25`
+- **Severity**: Major
+- **Description**: Empty catch block swallows exceptions
+- **Sonar Rule**: typescript:S2737
+
+#### **Magic Numbers**
+- **Location**: `routes/sonar-test.ts:30`
+- **Severity**: Minor
+- **Description**: Hard-coded numeric literals without explanation
+- **Sonar Rule**: typescript:S109
+
+### 2. Security Issues (3 issues)
+
+#### **Hard-coded Credentials** (Issue #3)
+- **Location**: `lib/sonar-issues.ts:19-20`
+- **Severity**: Blocker
+- **Description**: Hard-coded database password and API key
+- **Sonar Rule**: typescript:S2068
+
+#### **SQL Injection Vulnerability** (Issue #10)
+- **Location**: `lib/sonar-issues.ts:141-144`
+- **Severity**: Blocker
+- **Description**: Unsanitized user input in SQL query construction
+- **Sonar Rule**: typescript:S3649
+
+#### **Weak Cryptographic Algorithm**
+- **Location**: `routes/sonar-test.ts:15`
+- **Severity**: Major
+- **Description**: MD5 hash algorithm is cryptographically weak
+- **Sonar Rule**: typescript:S4790
+
+### 3. Bug Risks (2 issues)
+
+#### **Potential Null Pointer Dereference** (Issue #6)
+- **Location**: `lib/sonar-issues.ts:86`
+- **Severity**: Major
+- **Description**: Calling method on potentially undefined value
+- **Sonar Rule**: typescript:S2259
+
+#### **Resource Leak** (Issue #7)
+- **Location**: `lib/sonar-issues.ts:92-96`
+- **Severity**: Major
+- **Description**: File handle opened but never closed
+- **Sonar Rule**: typescript:S2095
+
+## Detection Verification
+
+All issues have been verified to be detectable by:
+- ESLint with TypeScript rules (compatible with SonarJS)
+- TypeScript compiler strict mode
+- Standard SonarQube rules for TypeScript/JavaScript
+
+## Impact Assessment
+
+- **No functional impact**: These files are standalone and don't affect existing application functionality
+- **Intentional design**: All issues are clearly documented as intentional for testing purposes
+- **Diverse coverage**: Issues span all major Sonar categories (Security, Reliability, Maintainability)
+- **Realistic patterns**: All issues represent real-world anti-patterns commonly found in production code
+
+## Usage
+
+These files can be used for:
+- Testing Sonar analysis pipeline
+- Training developers on code quality issues
+- Validating Sonar rule configurations
+- Demonstrating different severity levels and issue types
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diff --git a/lib/sonar-issues.ts b/lib/sonar-issues.ts
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+++ b/lib/sonar-issues.ts
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+/*
+ * Copyright (c) 2014-2024 Bjoern Kimminich & the OWASP Juice Shop contributors.
+ * SPDX-License-Identifier: MIT
+ */
+
+// This file contains intentional Sonar code quality issues for testing purposes
+
+import { type Request, type Response } from 'express'
+import fs from 'fs'
+import crypto from 'crypto'
+
+// Issue 1: Unused import (Code Smell - Major)
+import * as path from 'path'
+
+// Issue 2: Unused variable (Code Smell - Minor)
+const UNUSED_CONSTANT = 'This variable is never used'
+
+// Issue 3: Hard-coded credentials (Security Hotspot - Blocker)
+const DATABASE_PASSWORD = 'admin123'
+const API_KEY = 'sk-1234567890abcdef'
+
+// Issue 4: Function with too many parameters (Code Smell - Major)
+export function processUserData(
+  userId: string,
+  userName: string,
+  userEmail: string,
+  userPassword: string,
+  userAge: number,
+  userAddress: string,
+  userPhone: string,
+  userCountry: string,
+  userRole: string,
+  userStatus: string
+): void {
+  console.log('Processing user data...')
+}
+
+// Issue 5: Cognitive complexity too high (Code Smell - Critical)
+export function complexFunction(data: any): any {
+  if (data) {
+    if (data.type === 'user') {
+      if (data.status === 'active') {
+        if (data.permissions) {
+          if (data.permissions.read) {
+            if (data.permissions.write) {
+              if (data.permissions.delete) {
+                if (data.role === 'admin') {
+                  if (data.department === 'IT') {
+                    if (data.clearance >= 5) {
+                      return 'full_access'
+                    } else {
+                      return 'limited_access'
+                    }
+                  } else {
+                    return 'department_access'
+                  }
+                } else {
+                  return 'user_access'
+                }
+              } else {
+                return 'read_write_access'
+              }
+            } else {
+              return 'read_only_access'
+            }
+          } else {
+            return 'no_access'
+          }
+        } else {
+          return 'default_access'
+        }
+      } else {
+        return 'inactive_user'
+      }
+    } else {
+      return 'invalid_type'
+    }
+  } else {
+    return null
+  }
+}
+
+// Issue 6: Potential null pointer dereference (Bug - Major)
+export function processRequest(req: Request): string {
+  const userAgent = req.headers['user-agent']
+  return userAgent.toLowerCase() // Potential null/undefined dereference
+}
+
+// Issue 7: Resource leak - file handle not closed (Bug - Major)
+export function readConfigFile(): string {
+  const fd = fs.openSync('/tmp/config.txt', 'r')
+  const buffer = Buffer.alloc(1024)
+  fs.readSync(fd, buffer, 0, 1024, 0)
+  // Missing fs.closeSync(fd) - resource leak
+  return buffer.toString()
+}
+
+// Issue 8: Dead code - unreachable statement (Code Smell - Major)
+export function unreachableCode(): string {
+  return 'This will always return here'
+  console.log('This line is unreachable') // Dead code
+  return 'This will never be reached'
+}
+
+// Issue 9: Duplicate code blocks (Code Smell - Major)
+export function validateUserInput(input: string): boolean {
+  if (!input) {
+    console.log('Input validation failed: empty input')
+    return false
+  }
+  if (input.length < 3) {
+    console.log('Input validation failed: too short')
+    return false
+  }
+  if (input.length > 100) {
+    console.log('Input validation failed: too long')
+    return false
+  }
+  return true
+}
+
+export function validatePasswordInput(password: string): boolean {
+  if (!password) {
+    console.log('Input validation failed: empty input') // Duplicate
+    return false
+  }
+  if (password.length < 3) {
+    console.log('Input validation failed: too short') // Duplicate
+    return false
+  }
+  if (password.length > 100) {
+    console.log('Input validation failed: too long') // Duplicate
+    return false
+  }
+  return true
+}
+
+// Issue 10: SQL injection vulnerability pattern (Security - Blocker)
+export function searchUsers(query: string): string {
+  // This simulates a SQL injection vulnerability pattern
+  const sqlQuery = `SELECT * FROM users WHERE name LIKE '%${query}%'`
+  console.log('Executing query:', sqlQuery)
+  return sqlQuery
+}
+
+// Additional complexity for the cognitive complexity function
+export function anotherComplexFunction(input: any): any {
+  for (let i = 0; i < input.length; i++) {
+    if (input[i].type === 'data') {
+      try {
+        if (input[i].value) {
+          switch (input[i].format) {
+            case 'json':
+              if (input[i].valid) {
+                for (let j = 0; j < input[i].items.length; j++) {
+                  if (input[i].items[j].active) {
+                    return input[i].items[j]
+                  }
+                }
+              }
+              break
+            case 'xml':
+              if (input[i].parsed) {
+                return input[i].content
+              }
+              break
+            default:
+              return null
+          }
+        }
+      } catch (error) {
+        console.log('Error processing item:', error)
+      }
+    }
+  }
+  return null
+}
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diff --git a/routes/sonar-test.ts b/routes/sonar-test.ts
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+/*
+ * Copyright (c) 2014-2024 Bjoern Kimminich & the OWASP Juice Shop contributors.
+ * SPDX-License-Identifier: MIT
+ */
+
+// Additional Sonar issues for testing
+
+import { type Request, type Response, type NextFunction } from 'express'
+
+// Issue: Weak cryptographic algorithm (Security - Major)
+import crypto from 'crypto'
+
+export function weakEncryption(data: string): string {
+  // MD5 is considered cryptographically weak
+  return crypto.createHash('md5').update(data).digest('hex')
+}
+
+// Issue: Empty catch block (Code Smell - Major)
+export function emptyCatchBlock(): void {
+  try {
+    // Some risky operation
+    JSON.parse('invalid json')
+  } catch (error) {
+    // Empty catch block - bad practice
+  }
+}
+
+// Issue: Magic numbers (Code Smell - Minor)
+export function magicNumbers(value: number): boolean {
+  return value > 42 && value < 1337 && value !== 999
+}
+
+module.exports = {
+  weakEncryption,
+  emptyCatchBlock,
+  magicNumbers
+}
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