diff --git a/.kiro/specs/user-auth-and-sharing/tasks.md b/.kiro/specs/user-auth-and-sharing/tasks.md
index 0b9ec43..421be96 100644
--- a/.kiro/specs/user-auth-and-sharing/tasks.md
+++ b/.kiro/specs/user-auth-and-sharing/tasks.md
@@ -6,7 +6,7 @@
   - Set up environment variables for auth secrets
   - _Requirements: 1.1, 2.1_
 
-- [ ] 2. Update database schema for multi-user support
+- [x] 2. Update database schema for multi-user support
   - Add User model with email, passwordHash, and name fields
   - Add Collaborator model for list sharing
   - Add Invitation model for sharing invitations
@@ -26,7 +26,7 @@
   - **Property 3: Password hashing on registration**
   - **Validates: Requirements 1.3**
 
-- [ ] 3. Implement user registration functionality
+- [x] 3. Implement user registration functionality
   - Create registration server action with email/password validation
   - Implement password hashing with bcrypt
   - Add email uniqueness check
diff --git a/auth.ts b/auth.ts
index 03951d1..4c05fae 100644
--- a/auth.ts
+++ b/auth.ts
@@ -1,6 +1,5 @@
 import NextAuth from "next-auth"
 import Credentials from "next-auth/providers/credentials"
-import { PrismaAdapter } from "@auth/prisma-adapter"
 import { prisma } from "@/lib/db"
 import bcrypt from "bcryptjs"
 import { z } from "zod"
@@ -12,7 +11,6 @@ const loginSchema = z.object({
 })
 
 export const { handlers, signIn, signOut, auth } = NextAuth({
-  adapter: PrismaAdapter(prisma),
   session: {
     strategy: "jwt",
   },
diff --git a/lib/__tests__/auth-actions.test.ts b/lib/__tests__/auth-actions.test.ts
new file mode 100644
index 0000000..13027af
--- /dev/null
+++ b/lib/__tests__/auth-actions.test.ts
@@ -0,0 +1,127 @@
+/**
+ * Tests for user registration functionality
+ * This file tests the core registration logic without session creation
+ */
+
+import { describe, it, expect, afterEach, vi } from 'vitest'
+import { prisma } from '../db'
+import bcrypt from 'bcryptjs'
+import { z } from 'zod'
+
+// Mock the auth module to avoid Next.js dependencies in tests
+vi.mock('@/auth', () => ({
+  signIn: vi.fn(),
+}))
+
+// Import after mocking
+import { registerUser } from '../auth-actions'
+
+describe('registerUser', () => {
+  // Clean up test users after each test
+  afterEach(async () => {
+    await prisma.user.deleteMany({
+      where: {
+        email: {
+          contains: 'test-',
+        },
+      },
+    })
+  })
+
+  it('should create a new user with valid credentials', async () => {
+    const email = `test-${Date.now()}@example.com`
+    const password = 'password123'
+    const name = 'Test User'
+
+    const result = await registerUser(email, password, name)
+
+    expect(result.success).toBe(true)
+    if (result.success) {
+      expect(result.userId).toBeDefined()
+      expect(typeof result.userId).toBe('string')
+
+      // Verify user was created in database
+      const user = await prisma.user.findUnique({
+        where: { email },
+      })
+
+      expect(user).toBeDefined()
+      expect(user?.email).toBe(email)
+      expect(user?.name).toBe(name)
+      expect(user?.passwordHash).toBeDefined()
+      expect(user?.passwordHash).not.toBe(password) // Password should be hashed
+    }
+  })
+
+  it('should reject registration with duplicate email', async () => {
+    const email = `test-${Date.now()}@example.com`
+    const password = 'password123'
+
+    // Create first user
+    const result1 = await registerUser(email, password)
+    expect(result1.success).toBe(true)
+
+    // Try to create second user with same email
+    const result2 = await registerUser(email, password)
+    expect(result2.success).toBe(false)
+    if (!result2.success) {
+      expect(result2.error).toContain('already registered')
+    }
+  })
+
+  it('should hash the password before storing', async () => {
+    const email = `test-${Date.now()}@example.com`
+    const password = 'password123'
+
+    const result = await registerUser(email, password)
+    expect(result.success).toBe(true)
+
+    const user = await prisma.user.findUnique({
+      where: { email },
+    })
+
+    expect(user?.passwordHash).toBeDefined()
+    expect(user?.passwordHash).not.toBe(password)
+
+    // Verify the hash is valid
+    const isValid = await bcrypt.compare(password, user!.passwordHash)
+    expect(isValid).toBe(true)
+  })
+
+  it('should reject password shorter than 8 characters', async () => {
+    const email = `test-${Date.now()}@example.com`
+    const password = 'short'
+
+    const result = await registerUser(email, password)
+    expect(result.success).toBe(false)
+    if (!result.success) {
+      expect(result.error).toContain('at least 8 characters')
+    }
+  })
+
+  it('should reject invalid email format', async () => {
+    const email = 'invalid-email'
+    const password = 'password123'
+
+    const result = await registerUser(email, password)
+    expect(result.success).toBe(false)
+    if (!result.success) {
+      expect(result.error).toContain('Invalid email')
+    }
+  })
+
+  it('should create user without name (optional field)', async () => {
+    const email = `test-${Date.now()}@example.com`
+    const password = 'password123'
+
+    const result = await registerUser(email, password)
+    expect(result.success).toBe(true)
+
+    const user = await prisma.user.findUnique({
+      where: { email },
+    })
+
+    expect(user).toBeDefined()
+    expect(user?.name).toBeNull()
+  })
+})
diff --git a/lib/auth-actions.ts b/lib/auth-actions.ts
new file mode 100644
index 0000000..d98b2b2
--- /dev/null
+++ b/lib/auth-actions.ts
@@ -0,0 +1,83 @@
+'use server'
+
+import { prisma } from './db'
+import bcrypt from 'bcryptjs'
+import { z } from 'zod'
+import { signIn } from '@/auth'
+
+// Validation schemas
+const registerSchema = z.object({
+  email: z.string().email({ message: 'Invalid email address' }),
+  password: z.string().min(8, { message: 'Password must be at least 8 characters' }),
+  name: z.string().optional(),
+})
+
+export type RegisterResult = 
+  | { success: true; userId: string }
+  | { success: false; error: string }
+
+/**
+ * Register a new user with email and password
+ * Requirements: 1.1, 1.2, 1.3, 1.4, 1.5
+ */
+export async function registerUser(
+  email: string,
+  password: string,
+  name?: string
+): Promise<RegisterResult> {
+  try {
+    // Validate input (Requirement 1.5 - password length validation)
+    const validation = registerSchema.safeParse({ email, password, name })
+    
+    if (!validation.success) {
+      const errors = validation.error.issues.map((issue) => issue.message).join(', ')
+      return { success: false, error: errors }
+    }
+
+    const { email: validEmail, password: validPassword, name: validName } = validation.data
+
+    // Check if email already exists (Requirement 1.2 - duplicate email rejection)
+    const existingUser = await prisma.user.findUnique({
+      where: { email: validEmail },
+    })
+
+    if (existingUser) {
+      return { success: false, error: 'Email already registered' }
+    }
+
+    // Hash password (Requirement 1.3 - password hashing)
+    const passwordHash = await bcrypt.hash(validPassword, 10)
+
+    // Create user (Requirement 1.1 - create user with unique identifier)
+    const user = await prisma.user.create({
+      data: {
+        email: validEmail,
+        passwordHash,
+        name: validName || null,
+      },
+    })
+
+    // Create session after successful registration (Requirement 1.4)
+    try {
+      await signIn('credentials', {
+        email: validEmail,
+        password: validPassword,
+        redirect: false,
+      })
+    } catch (error) {
+      // If session creation fails, still return success since user was created
+      console.error('Session creation failed after registration:', error)
+    }
+
+    return { success: true, userId: user.id }
+  } catch (error) {
+    console.error('Registration error:', error)
+    
+    // Handle unique constraint violation (shouldn't happen due to check above, but just in case)
+    if (error instanceof Error && error.message.includes('Unique constraint')) {
+      return { success: false, error: 'Email already registered' }
+    }
+    
+    return { success: false, error: 'Registration failed. Please try again.' }
+  }
+}
diff --git a/lib/validation.ts b/lib/validation.ts
index 2c6a3f4..54ba88c 100644
--- a/lib/validation.ts
+++ b/lib/validation.ts
@@ -301,3 +301,46 @@ export function validateItemData(data: {
     },
   }
 }
+
+/**
+ * Validate email format
+ */
+export function validateEmail(email: string): ValidationResult {
+  const sanitized = sanitizeString(email)
+  
+  if (!sanitized) {
+    return { isValid: false, error: 'Email is required' }
+  }
+  
+  // Basic email regex pattern
+  const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/
+  
+  if (!emailRegex.test(sanitized)) {
+    return { isValid: false, error: 'Invalid email format' }
+  }
+  
+  if (sanitized.length > 255) {
+    return { isValid: false, error: 'Email must be less than 255 characters' }
+  }
+  
+  return { isValid: true }
+}
+
+/**
+ * Validate password strength
+ */
+export function validatePassword(password: string): ValidationResult {
+  if (!password) {
+    return { isValid: false, error: 'Password is required' }
+  }
+  
+  if (password.length < 8) {
+    return { isValid: false, error: 'Password must be at least 8 characters' }
+  }
+  
+  if (password.length > 128) {
+    return { isValid: false, error: 'Password must be less than 128 characters' }
+  }
+  
+  return { isValid: true }
+}
diff --git a/package-lock.json b/package-lock.json
index d19529d..d0bd3f0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,13 +24,15 @@
         "@types/node": "^20",
         "@types/react": "^18",
         "@types/react-dom": "^18",
+        "@vitest/ui": "^4.0.14",
         "autoprefixer": "^10.0.1",
         "eslint": "^8",
         "eslint-config-next": "14.0.4",
         "postcss": "^8",
         "prisma": "^5.7.1",
         "tailwindcss": "^3.3.0",
-        "typescript": "^5"
+        "typescript": "^5",
+        "vitest": "^4.0.14"
       }
     },
     "node_modules/@alloc/quick-lru": {
@@ -150,6 +152,448 @@
         "tslib": "^2.4.0"
       }
     },
+    "node_modules/@esbuild/aix-ppc64": {
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+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
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+        "aix"
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+      "engines": {
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+      }
+    },
+    "node_modules/@esbuild/android-arm": {
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+      "version": "3.10.0",
+      "resolved": "https://registry.npmjs.org/std-env/-/std-env-3.10.0.tgz",
+      "integrity": "sha512-5GS12FdOZNliM5mAOxFRg7Ir0pWz8MdpYm6AY6VPkGpbA7ZzmbzNcBJQ0GPvvyWgcY7QAhCgf9Uy89I03faLkg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/stop-iteration-iterator": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/stop-iteration-iterator/-/stop-iteration-iterator-1.1.0.tgz",
@@ -5578,6 +6714,20 @@
         "node": ">=0.8"
       }
     },
+    "node_modules/tinybench": {
+      "version": "2.9.0",
+      "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
+      "integrity": "sha512-0+DUvqWMValLmha6lr4kD8iAMK1HzV0/aKnCtWb9v9641TnP/MFb7Pc2bxoxQjTXAErryXVgUOfv2YqNllqGeg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/tinyexec": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-0.3.2.tgz",
+      "integrity": "sha512-KQQR9yN7R5+OSwaK0XQoj22pwHoTlgYqmUscPYoknOoWCWfj/5/ABTMRi69FrKU5ffPVh5QcFikpWJI/P1ocHA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/tinyglobby": {
       "version": "0.2.15",
       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.15.tgz",
@@ -5626,6 +6776,16 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
     },
+    "node_modules/tinyrainbow": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-3.0.3.tgz",
+      "integrity": "sha512-PSkbLUoxOFRzJYjjxHJt9xro7D+iilgMX/C9lawzVuYiIdcihh9DXmVibBe8lmcFrRi/VzlPjBxbN7rH24q8/Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
     "node_modules/to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
@@ -5639,6 +6799,16 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/totalist": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/totalist/-/totalist-3.0.1.tgz",
+      "integrity": "sha512-sf4i37nQ2LBx4m3wB74y+ubopq6W/dIzXg0FDGjsYnZHVa1Da8FH853wlL2gtUhg+xJXjfk3kUZS3BRoQeoQBQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/ts-api-utils": {
       "version": "1.4.3",
       "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-1.4.3.tgz",
@@ -5905,6 +7075,203 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/vite": {
+      "version": "6.4.1",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-6.4.1.tgz",
+      "integrity": "sha512-+Oxm7q9hDoLMyJOYfUYBuHQo+dkAloi33apOPP56pzj+vsdJDzr+j1NISE5pyaAuKL4A3UD34qd0lx5+kfKp2g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "esbuild": "^0.25.0",
+        "fdir": "^6.4.4",
+        "picomatch": "^4.0.2",
+        "postcss": "^8.5.3",
+        "rollup": "^4.34.9",
+        "tinyglobby": "^0.2.13"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^18.0.0 || ^20.0.0 || >=22.0.0",
+        "jiti": ">=1.21.0",
+        "less": "*",
+        "lightningcss": "^1.21.0",
+        "sass": "*",
+        "sass-embedded": "*",
+        "stylus": "*",
+        "sugarss": "*",
+        "terser": "^5.16.0",
+        "tsx": "^4.8.1",
+        "yaml": "^2.4.2"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "jiti": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "lightningcss": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        },
+        "tsx": {
+          "optional": true
+        },
+        "yaml": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vite/node_modules/fdir": {
+      "version": "6.5.0",
+      "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
+      "integrity": "sha512-tIbYtZbucOs0BRGqPJkshJUYdL+SDH7dVM8gjy+ERp3WAUjLEFJE+02kanyHtwjWOnwrKYBiwAmM0p4kLJAnXg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12.0.0"
+      },
+      "peerDependencies": {
+        "picomatch": "^3 || ^4"
+      },
+      "peerDependenciesMeta": {
+        "picomatch": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vite/node_modules/picomatch": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
+      "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/jonschlinkert"
+      }
+    },
+    "node_modules/vitest": {
+      "version": "4.0.14",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.0.14.tgz",
+      "integrity": "sha512-d9B2J9Cm9dN9+6nxMnnNJKJCtcyKfnHj15N6YNJfaFHRLua/d3sRKU9RuKmO9mB0XdFtUizlxfz/VPbd3OxGhw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/expect": "4.0.14",
+        "@vitest/mocker": "4.0.14",
+        "@vitest/pretty-format": "4.0.14",
+        "@vitest/runner": "4.0.14",
+        "@vitest/snapshot": "4.0.14",
+        "@vitest/spy": "4.0.14",
+        "@vitest/utils": "4.0.14",
+        "es-module-lexer": "^1.7.0",
+        "expect-type": "^1.2.2",
+        "magic-string": "^0.30.21",
+        "obug": "^2.1.1",
+        "pathe": "^2.0.3",
+        "picomatch": "^4.0.3",
+        "std-env": "^3.10.0",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^0.3.2",
+        "tinyglobby": "^0.2.15",
+        "tinyrainbow": "^3.0.3",
+        "vite": "^6.0.0 || ^7.0.0",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "4.0.14",
+        "@vitest/browser-preview": "4.0.14",
+        "@vitest/browser-webdriverio": "4.0.14",
+        "@vitest/ui": "4.0.14",
+        "happy-dom": "*",
+        "jsdom": "*"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vitest/node_modules/picomatch": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
+      "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/jonschlinkert"
+      }
+    },
     "node_modules/watchpack": {
       "version": "2.4.0",
       "resolved": "https://registry.npmjs.org/watchpack/-/watchpack-2.4.0.tgz",
@@ -6023,6 +7390,23 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/word-wrap": {
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
diff --git a/package.json b/package.json
index 95d2156..02769f0 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,8 @@
     "build": "next build",
     "start": "next start",
     "lint": "next lint",
+    "test": "vitest --run",
+    "test:watch": "vitest",
     "db:push": "prisma db push",
     "db:studio": "prisma studio",
     "icons:generate": "node scripts/generate-icons.js",
@@ -29,12 +31,14 @@
     "@types/node": "^20",
     "@types/react": "^18",
     "@types/react-dom": "^18",
+    "@vitest/ui": "^4.0.14",
     "autoprefixer": "^10.0.1",
     "eslint": "^8",
     "eslint-config-next": "14.0.4",
     "postcss": "^8",
     "prisma": "^5.7.1",
     "tailwindcss": "^3.3.0",
-    "typescript": "^5"
+    "typescript": "^5",
+    "vitest": "^4.0.14"
   }
 }
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 0000000..6d9bb91
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,16 @@
+import { defineConfig } from 'vitest/config'
+import path from 'path'
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: 'node',
+    setupFiles: [],
+  },
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './'),
+    },
+    conditions: ['node', 'default'],
+  },
+})