diff --git a/package-lock.json b/package-lock.json
index 1706629..bfa3002 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -557,6 +557,11 @@
         "undici-types": "~6.21.0"
       }
     },
+    "@types/validator": {
+      "version": "13.15.10",
+      "resolved": "https://registry.npmjs.org/@types/validator/-/validator-13.15.10.tgz",
+      "integrity": "sha512-T8L6i7wCuyoK8A/ZeLYt1+q0ty3Zb9+qbSSvrIVitzT3YjZqkTZ40IbRsPanlB4h1QB3JVL1SYCdR6ngtFYcuA=="
+    },
     "@webassemblyjs/ast": {
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.14.1.tgz",
@@ -1083,6 +1088,21 @@
       "integrity": "sha512-rNjApaLzuwaOTjCiT8lSDdGN1APCiqkChLMJxJPWLunPAt5fy8xgU9/jNOchV84wfIxrA0lRQB7oCT8jrn/wrQ==",
       "dev": true
     },
+    "class-transformer": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/class-transformer/-/class-transformer-0.5.1.tgz",
+      "integrity": "sha512-SQa1Ws6hUbfC98vKGxZH3KFY0Y1lm5Zm0SY8XX9zbK7FJCyVEac3ATW0RIpwzW+oOfmHE5PMPufDG9hCfoEOMw=="
+    },
+    "class-validator": {
+      "version": "0.15.1",
+      "resolved": "https://registry.npmjs.org/class-validator/-/class-validator-0.15.1.tgz",
+      "integrity": "sha512-LqoS80HBBSCVhz/3KloUly0ovokxpdOLR++Al3J3+dHXWt9sTKlKd4eYtoxhxyUjoe5+UcIM+5k9MIxyBWnRTw==",
+      "requires": {
+        "@types/validator": "^13.15.3",
+        "libphonenumber-js": "^1.11.1",
+        "validator": "^13.15.22"
+      }
+    },
     "cli-cursor": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
@@ -2247,6 +2267,11 @@
         "safe-buffer": "^5.0.1"
       }
     },
+    "libphonenumber-js": {
+      "version": "1.13.1",
+      "resolved": "https://registry.npmjs.org/libphonenumber-js/-/libphonenumber-js-1.13.1.tgz",
+      "integrity": "sha512-GEw0GLL7YUUA6nv21IsCvVjtI5Ejn84sjbdfQ9KxdbqEVOk1PZh7xejn01EEiniKw+dBeCfim+8MGeuvVuE2BA=="
+    },
     "lines-and-columns": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/lines-and-columns/-/lines-and-columns-1.2.4.tgz",
@@ -3476,6 +3501,11 @@
       "integrity": "sha512-wa7YjyUGfNZngI/vtK0UHAN+lgDCxBPCylVXGp0zu59Fz5aiGtNXaq3DhIov063MorB+VfufLh3JlF2KdTK3xg==",
       "dev": true
     },
+    "validator": {
+      "version": "13.15.35",
+      "resolved": "https://registry.npmjs.org/validator/-/validator-13.15.35.tgz",
+      "integrity": "sha512-TQ5pAGhd5whStmqWvYF4OjQROlmv9SMFVt37qoCBdqRffuuklWYQlCNnEs2ZaIBD1kZRNnikiZOS1eqgkar0iw=="
+    },
     "vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
diff --git a/package.json b/package.json
index e3e65d2..c160623 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,8 @@
     "@nestjs/platform-express": "^10.4.8",
     "@nestjs/swagger": "^7.4.2",
     "@nestjs/typeorm": "^10.0.2",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.15.1",
     "dotenv": "^16.4.7",
     "pg": "^8.13.1",
     "reflect-metadata": "^0.2.2",
diff --git a/src/main.ts b/src/main.ts
index 9e5d393..968a1ae 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,10 +1,19 @@
 import 'reflect-metadata';
+import { ValidationPipe } from '@nestjs/common';
 import { NestFactory } from '@nestjs/core';
 import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
 import { AppModule } from './app.module';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
+  app.useGlobalPipes(
+    new ValidationPipe({
+      forbidNonWhitelisted: true,
+      transform: true,
+      whitelist: true,
+    }),
+  );
+
   const swaggerConfig = new DocumentBuilder()
     .setTitle('Montime API')
     .setDescription('Local services super app API')
diff --git a/src/modules/attribute-definitions/dto/create-attribute-definition.dto.ts b/src/modules/attribute-definitions/dto/create-attribute-definition.dto.ts
index 6115c62..600d718 100644
--- a/src/modules/attribute-definitions/dto/create-attribute-definition.dto.ts
+++ b/src/modules/attribute-definitions/dto/create-attribute-definition.dto.ts
@@ -1,13 +1,53 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import {
+  IsArray,
+  IsBoolean,
+  IsEnum,
+  IsOptional,
+  IsString,
+  IsUUID,
+  Matches,
+  MaxLength,
+} from 'class-validator';
 import { AttributeType } from '../../../entities/attribute-definition.entity';
 
 export class CreateAttributeDefinitionDto {
+  @ApiProperty({ example: 'Has Waiting Room' })
+  @IsString()
+  @MaxLength(120)
   title!: string;
+
   /** یکتا در محدوده همان دسته شغلی */
+  @ApiProperty({ example: 'has-waiting-room' })
+  @IsString()
+  @MaxLength(120)
+  @Matches(/^[a-z0-9]+(?:-[a-z0-9]+)*$/, {
+    message: 'key must be lowercase words separated by hyphens',
+  })
   key!: string;
+
+  @ApiProperty({ enum: AttributeType, example: AttributeType.BOOLEAN })
+  @IsEnum(AttributeType)
   type!: AttributeType;
+
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
   categoryId!: string;
+
   /** برای type=select آرایه گزینه‌ها */
+  @ApiPropertyOptional({ type: [String], example: ['small', 'medium', 'large'] })
+  @IsOptional()
+  @IsArray()
+  @IsString({ each: true })
   options?: string[];
+
+  @ApiPropertyOptional({ example: false })
+  @IsOptional()
+  @IsBoolean()
   required?: boolean;
+
+  @ApiPropertyOptional({ example: true })
+  @IsOptional()
+  @IsBoolean()
   isFilterable?: boolean;
 }
diff --git a/src/modules/attribute-definitions/dto/update-attribute-definition.dto.ts b/src/modules/attribute-definitions/dto/update-attribute-definition.dto.ts
index 06d4cc6..3e35e3d 100644
--- a/src/modules/attribute-definitions/dto/update-attribute-definition.dto.ts
+++ b/src/modules/attribute-definitions/dto/update-attribute-definition.dto.ts
@@ -1,11 +1,59 @@
+import { ApiPropertyOptional } from '@nestjs/swagger';
+import {
+  IsArray,
+  IsBoolean,
+  IsEnum,
+  IsOptional,
+  IsString,
+  IsUUID,
+  Matches,
+  MaxLength,
+} from 'class-validator';
 import { AttributeType } from '../../../entities/attribute-definition.entity';
 
 export class UpdateAttributeDefinitionDto {
+  @ApiPropertyOptional({ example: 'Has Waiting Room' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(120)
   title?: string;
+
+  @ApiPropertyOptional({ example: 'has-waiting-room' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(120)
+  @Matches(/^[a-z0-9]+(?:-[a-z0-9]+)*$/, {
+    message: 'key must be lowercase words separated by hyphens',
+  })
   key?: string;
+
+  @ApiPropertyOptional({ enum: AttributeType, example: AttributeType.BOOLEAN })
+  @IsOptional()
+  @IsEnum(AttributeType)
   type?: AttributeType;
+
+  @ApiPropertyOptional({ format: 'uuid' })
+  @IsOptional()
+  @IsUUID()
   categoryId?: string;
+
+  @ApiPropertyOptional({
+    type: [String],
+    example: ['small', 'medium', 'large'],
+    nullable: true,
+  })
+  @IsOptional()
+  @IsArray()
+  @IsString({ each: true })
   options?: string[] | null;
+
+  @ApiPropertyOptional({ example: false })
+  @IsOptional()
+  @IsBoolean()
   required?: boolean;
+
+  @ApiPropertyOptional({ example: true })
+  @IsOptional()
+  @IsBoolean()
   isFilterable?: boolean;
 }
diff --git a/src/modules/auth/dto/request-otp.dto.ts b/src/modules/auth/dto/request-otp.dto.ts
index 502dda1..1dde95e 100644
--- a/src/modules/auth/dto/request-otp.dto.ts
+++ b/src/modules/auth/dto/request-otp.dto.ts
@@ -1,3 +1,11 @@
+import { ApiProperty } from '@nestjs/swagger';
+import { IsString, Matches } from 'class-validator';
+
 export class RequestOtpDto {
+  @ApiProperty({ example: '09122222222' })
+  @IsString()
+  @Matches(/^(\+?\d{10,15}|09\d{9})$/, {
+    message: 'mobile must be a valid mobile number',
+  })
   mobile!: string;
 }
diff --git a/src/modules/auth/dto/verify-otp.dto.ts b/src/modules/auth/dto/verify-otp.dto.ts
index da499aa..edbc558 100644
--- a/src/modules/auth/dto/verify-otp.dto.ts
+++ b/src/modules/auth/dto/verify-otp.dto.ts
@@ -1,4 +1,18 @@
+import { ApiProperty } from '@nestjs/swagger';
+import { IsString, Matches } from 'class-validator';
+
 export class VerifyOtpDto {
+  @ApiProperty({ example: '09122222222' })
+  @IsString()
+  @Matches(/^(\+?\d{10,15}|09\d{9})$/, {
+    message: 'mobile must be a valid mobile number',
+  })
   mobile!: string;
+
+  @ApiProperty({ example: '123456' })
+  @IsString()
+  @Matches(/^\d{4,8}$/, {
+    message: 'code must be 4 to 8 digits',
+  })
   code!: string;
 }
diff --git a/src/modules/bookings/dto/create-booking.dto.ts b/src/modules/bookings/dto/create-booking.dto.ts
index 992303c..b59a9ab 100644
--- a/src/modules/bookings/dto/create-booking.dto.ts
+++ b/src/modules/bookings/dto/create-booking.dto.ts
@@ -1,8 +1,27 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { IsISO8601, IsOptional, IsString, IsUUID, MaxLength } from 'class-validator';
+
 export class CreateBookingDto {
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
   customerId!: string;
+
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
   businessId!: string;
+
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
   businessServiceId!: string;
+
   /** ISO 8601 datetime string */
+  @ApiProperty({ example: '2026-05-13T10:00:00.000Z' })
+  @IsISO8601()
   scheduledAt!: string;
+
+  @ApiPropertyOptional({ example: 'Test booking', nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
   note?: string | null;
 }
diff --git a/src/modules/bookings/dto/update-booking.dto.ts b/src/modules/bookings/dto/update-booking.dto.ts
index 965e62e..76cf6dd 100644
--- a/src/modules/bookings/dto/update-booking.dto.ts
+++ b/src/modules/bookings/dto/update-booking.dto.ts
@@ -1,7 +1,21 @@
+import { ApiPropertyOptional } from '@nestjs/swagger';
+import { IsEnum, IsISO8601, IsOptional, IsString, MaxLength } from 'class-validator';
 import { BookingStatus } from '../../../entities/booking.entity';
 
 export class UpdateBookingDto {
+  @ApiPropertyOptional({ example: '2026-05-13T10:00:00.000Z' })
+  @IsOptional()
+  @IsISO8601()
   scheduledAt?: string;
+
+  @ApiPropertyOptional({ enum: BookingStatus, example: BookingStatus.CONFIRMED })
+  @IsOptional()
+  @IsEnum(BookingStatus)
   status?: BookingStatus;
+
+  @ApiPropertyOptional({ example: 'Customer asked for morning slot', nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
   note?: string | null;
 }
diff --git a/src/modules/business-attribute-values/dto/create-business-attribute-value.dto.ts b/src/modules/business-attribute-values/dto/create-business-attribute-value.dto.ts
index 589fad4..5c068eb 100644
--- a/src/modules/business-attribute-values/dto/create-business-attribute-value.dto.ts
+++ b/src/modules/business-attribute-values/dto/create-business-attribute-value.dto.ts
@@ -1,6 +1,19 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { IsOptional, IsString, IsUUID, MaxLength } from 'class-validator';
+
 export class CreateBusinessAttributeValueDto {
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
   businessId!: string;
+
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
   attributeDefinitionId!: string;
+
   /** مقدار به صورت رشته ذخیره می‌شود؛ برای boolean مثلا true/false */
+  @ApiPropertyOptional({ example: 'true', nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
   value?: string | null;
 }
diff --git a/src/modules/business-attribute-values/dto/update-business-attribute-value.dto.ts b/src/modules/business-attribute-values/dto/update-business-attribute-value.dto.ts
index 8c80d34..5e5a713 100644
--- a/src/modules/business-attribute-values/dto/update-business-attribute-value.dto.ts
+++ b/src/modules/business-attribute-values/dto/update-business-attribute-value.dto.ts
@@ -1,3 +1,10 @@
+import { ApiPropertyOptional } from '@nestjs/swagger';
+import { IsOptional, IsString, MaxLength } from 'class-validator';
+
 export class UpdateBusinessAttributeValueDto {
+  @ApiPropertyOptional({ example: 'true', nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
   value?: string | null;
 }
diff --git a/src/modules/business-categories/dto/create-business-category.dto.ts b/src/modules/business-categories/dto/create-business-category.dto.ts
index 45142ca..abe7057 100644
--- a/src/modules/business-categories/dto/create-business-category.dto.ts
+++ b/src/modules/business-categories/dto/create-business-category.dto.ts
@@ -1,5 +1,22 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { IsBoolean, IsOptional, IsString, Matches, MaxLength } from 'class-validator';
+
 export class CreateBusinessCategoryDto {
+  @ApiProperty({ example: 'Car Wash' })
+  @IsString()
+  @MaxLength(150)
   title!: string;
+
+  @ApiProperty({ example: 'car-wash' })
+  @IsString()
+  @MaxLength(120)
+  @Matches(/^[a-z0-9]+(?:-[a-z0-9]+)*$/, {
+    message: 'slug must be lowercase words separated by hyphens',
+  })
   slug!: string;
+
+  @ApiPropertyOptional({ example: true })
+  @IsOptional()
+  @IsBoolean()
   isActive?: boolean;
 }
diff --git a/src/modules/business-categories/dto/update-business-category.dto.ts b/src/modules/business-categories/dto/update-business-category.dto.ts
index 9d6fde6..feefbf4 100644
--- a/src/modules/business-categories/dto/update-business-category.dto.ts
+++ b/src/modules/business-categories/dto/update-business-category.dto.ts
@@ -1,5 +1,24 @@
+import { ApiPropertyOptional } from '@nestjs/swagger';
+import { IsBoolean, IsOptional, IsString, Matches, MaxLength } from 'class-validator';
+
 export class UpdateBusinessCategoryDto {
+  @ApiPropertyOptional({ example: 'Car Wash' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(150)
   title?: string;
+
+  @ApiPropertyOptional({ example: 'car-wash' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(120)
+  @Matches(/^[a-z0-9]+(?:-[a-z0-9]+)*$/, {
+    message: 'slug must be lowercase words separated by hyphens',
+  })
   slug?: string;
+
+  @ApiPropertyOptional({ example: true })
+  @IsOptional()
+  @IsBoolean()
   isActive?: boolean;
 }
diff --git a/src/modules/business-services/dto/create-business-service.dto.ts b/src/modules/business-services/dto/create-business-service.dto.ts
index 95c78e0..bda7db8 100644
--- a/src/modules/business-services/dto/create-business-service.dto.ts
+++ b/src/modules/business-services/dto/create-business-service.dto.ts
@@ -1,9 +1,31 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { IsBoolean, IsInt, IsNumber, IsOptional, IsUUID, Max, Min } from 'class-validator';
+
 export class CreateBusinessServiceDto {
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
   businessId!: string;
+
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
   serviceTemplateId!: string;
+
   /** قیمت به واحد پول (عدد اعشاری مجاز است) */
+  @ApiProperty({ example: 100000 })
+  @IsNumber({ maxDecimalPlaces: 2 })
+  @Min(0)
   price!: number;
+
   /** اگر خالی باشد از template.defaultDurationMinutes استفاده می‌شود */
+  @ApiPropertyOptional({ example: 30, nullable: true })
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  @Max(1440)
   durationMinutes?: number | null;
+
+  @ApiPropertyOptional({ example: true })
+  @IsOptional()
+  @IsBoolean()
   isActive?: boolean;
 }
diff --git a/src/modules/business-services/dto/update-business-service.dto.ts b/src/modules/business-services/dto/update-business-service.dto.ts
index d9755a3..57764a6 100644
--- a/src/modules/business-services/dto/update-business-service.dto.ts
+++ b/src/modules/business-services/dto/update-business-service.dto.ts
@@ -1,6 +1,27 @@
+import { ApiPropertyOptional } from '@nestjs/swagger';
+import { IsBoolean, IsInt, IsNumber, IsOptional, IsUUID, Max, Min } from 'class-validator';
+
 export class UpdateBusinessServiceDto {
+  @ApiPropertyOptional({ format: 'uuid' })
+  @IsOptional()
+  @IsUUID()
   serviceTemplateId?: string;
+
+  @ApiPropertyOptional({ example: 100000 })
+  @IsOptional()
+  @IsNumber({ maxDecimalPlaces: 2 })
+  @Min(0)
   price?: number;
+
+  @ApiPropertyOptional({ example: 30, nullable: true })
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  @Max(1440)
   durationMinutes?: number | null;
+
+  @ApiPropertyOptional({ example: true })
+  @IsOptional()
+  @IsBoolean()
   isActive?: boolean;
 }
diff --git a/src/modules/businesses/dto/assign-business-owner.dto.ts b/src/modules/businesses/dto/assign-business-owner.dto.ts
index 2c16c03..906cca4 100644
--- a/src/modules/businesses/dto/assign-business-owner.dto.ts
+++ b/src/modules/businesses/dto/assign-business-owner.dto.ts
@@ -1,4 +1,17 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { IsOptional, IsString, Matches, MaxLength } from 'class-validator';
+
 export class AssignBusinessOwnerDto {
+  @ApiProperty({ example: '09111111111' })
+  @IsString()
+  @Matches(/^(\+?\d{10,15}|09\d{9})$/, {
+    message: 'mobile must be a valid mobile number',
+  })
   mobile!: string;
+
+  @ApiPropertyOptional({ example: 'Business Admin', nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(150)
   fullName?: string | null;
 }
diff --git a/src/modules/businesses/dto/create-business.dto.ts b/src/modules/businesses/dto/create-business.dto.ts
index e9fb391..7fd2987 100644
--- a/src/modules/businesses/dto/create-business.dto.ts
+++ b/src/modules/businesses/dto/create-business.dto.ts
@@ -1,12 +1,68 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import {
+  IsBoolean,
+  IsLatitude,
+  IsLongitude,
+  IsOptional,
+  IsString,
+  IsUUID,
+  Matches,
+  MaxLength,
+} from 'class-validator';
+
 export class CreateBusinessDto {
+  @ApiProperty({ example: 'Shine Carwash' })
+  @IsString()
+  @MaxLength(150)
   title!: string;
+
+  @ApiProperty({ example: 'shine-carwash' })
+  @IsString()
+  @MaxLength(120)
+  @Matches(/^[a-z0-9]+(?:-[a-z0-9]+)*$/, {
+    message: 'slug must be lowercase words separated by hyphens',
+  })
   slug!: string;
+
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
   categoryId!: string;
+
+  @ApiPropertyOptional({ example: 'Premium carwash service' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
   description?: string;
+
+  @ApiPropertyOptional({ example: '09123456789' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(20)
   contactPhone?: string;
+
+  @ApiPropertyOptional({ example: 'Main street' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
   address?: string;
+
+  @ApiPropertyOptional({ example: 35.6892 })
+  @IsOptional()
+  @IsLatitude()
   latitude?: number;
+
+  @ApiPropertyOptional({ example: 51.389 })
+  @IsOptional()
+  @IsLongitude()
   longitude?: number;
+
+  @ApiPropertyOptional({ format: 'uuid' })
+  @IsOptional()
+  @IsUUID()
   ownerId?: string;
+
+  @ApiPropertyOptional({ example: true })
+  @IsOptional()
+  @IsBoolean()
   isActive?: boolean;
 }
diff --git a/src/modules/businesses/dto/update-business.dto.ts b/src/modules/businesses/dto/update-business.dto.ts
index db97b8d..2063b7a 100644
--- a/src/modules/businesses/dto/update-business.dto.ts
+++ b/src/modules/businesses/dto/update-business.dto.ts
@@ -1,12 +1,71 @@
+import { ApiPropertyOptional } from '@nestjs/swagger';
+import {
+  IsBoolean,
+  IsLatitude,
+  IsLongitude,
+  IsOptional,
+  IsString,
+  IsUUID,
+  Matches,
+  MaxLength,
+} from 'class-validator';
+
 export class UpdateBusinessDto {
+  @ApiPropertyOptional({ example: 'Shine Carwash' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(150)
   title?: string;
+
+  @ApiPropertyOptional({ example: 'shine-carwash' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(120)
+  @Matches(/^[a-z0-9]+(?:-[a-z0-9]+)*$/, {
+    message: 'slug must be lowercase words separated by hyphens',
+  })
   slug?: string;
+
+  @ApiPropertyOptional({ format: 'uuid' })
+  @IsOptional()
+  @IsUUID()
   categoryId?: string;
+
+  @ApiPropertyOptional({ example: 'Premium carwash service', nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
   description?: string | null;
+
+  @ApiPropertyOptional({ example: '09123456789', nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(20)
   contactPhone?: string | null;
+
+  @ApiPropertyOptional({ example: 'Main street', nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
   address?: string | null;
+
+  @ApiPropertyOptional({ example: 35.6892, nullable: true })
+  @IsOptional()
+  @IsLatitude()
   latitude?: number | null;
+
+  @ApiPropertyOptional({ example: 51.389, nullable: true })
+  @IsOptional()
+  @IsLongitude()
   longitude?: number | null;
+
+  @ApiPropertyOptional({ format: 'uuid', nullable: true })
+  @IsOptional()
+  @IsUUID()
   ownerId?: string | null;
+
+  @ApiPropertyOptional({ example: true })
+  @IsOptional()
+  @IsBoolean()
   isActive?: boolean;
 }
diff --git a/src/modules/service-templates/dto/create-service-template.dto.ts b/src/modules/service-templates/dto/create-service-template.dto.ts
index 3841f30..582a2dc 100644
--- a/src/modules/service-templates/dto/create-service-template.dto.ts
+++ b/src/modules/service-templates/dto/create-service-template.dto.ts
@@ -1,8 +1,49 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import {
+  IsBoolean,
+  IsInt,
+  IsOptional,
+  IsString,
+  IsUUID,
+  Matches,
+  Max,
+  MaxLength,
+  Min,
+} from 'class-validator';
+
 export class CreateServiceTemplateDto {
+  @ApiProperty({ example: 'Basic Wash' })
+  @IsString()
+  @MaxLength(150)
   title!: string;
+
+  @ApiProperty({ example: 'basic-wash' })
+  @IsString()
+  @MaxLength(120)
+  @Matches(/^[a-z0-9]+(?:-[a-z0-9]+)*$/, {
+    message: 'slug must be lowercase words separated by hyphens',
+  })
   slug!: string;
+
+  @ApiProperty({ format: 'uuid' })
+  @IsUUID()
   categoryId!: string;
+
+  @ApiPropertyOptional({ example: 'Exterior wash' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
   description?: string;
+
+  @ApiPropertyOptional({ example: 30 })
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  @Max(1440)
   defaultDurationMinutes?: number;
+
+  @ApiPropertyOptional({ example: true })
+  @IsOptional()
+  @IsBoolean()
   isActive?: boolean;
 }
diff --git a/src/modules/service-templates/dto/update-service-template.dto.ts b/src/modules/service-templates/dto/update-service-template.dto.ts
index e06b126..3260a7e 100644
--- a/src/modules/service-templates/dto/update-service-template.dto.ts
+++ b/src/modules/service-templates/dto/update-service-template.dto.ts
@@ -1,8 +1,52 @@
+import { ApiPropertyOptional } from '@nestjs/swagger';
+import {
+  IsBoolean,
+  IsInt,
+  IsOptional,
+  IsString,
+  IsUUID,
+  Matches,
+  Max,
+  MaxLength,
+  Min,
+} from 'class-validator';
+
 export class UpdateServiceTemplateDto {
+  @ApiPropertyOptional({ example: 'Basic Wash' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(150)
   title?: string;
+
+  @ApiPropertyOptional({ example: 'basic-wash' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(120)
+  @Matches(/^[a-z0-9]+(?:-[a-z0-9]+)*$/, {
+    message: 'slug must be lowercase words separated by hyphens',
+  })
   slug?: string;
+
+  @ApiPropertyOptional({ format: 'uuid' })
+  @IsOptional()
+  @IsUUID()
   categoryId?: string;
+
+  @ApiPropertyOptional({ example: 'Exterior wash', nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
   description?: string | null;
+
+  @ApiPropertyOptional({ example: 30 })
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  @Max(1440)
   defaultDurationMinutes?: number;
+
+  @ApiPropertyOptional({ example: true })
+  @IsOptional()
+  @IsBoolean()
   isActive?: boolean;
 }
diff --git a/src/modules/users/dto/update-user.dto.ts b/src/modules/users/dto/update-user.dto.ts
index af75af4..f5a9eaa 100644
--- a/src/modules/users/dto/update-user.dto.ts
+++ b/src/modules/users/dto/update-user.dto.ts
@@ -1,7 +1,21 @@
+import { ApiPropertyOptional } from '@nestjs/swagger';
+import { IsBoolean, IsEnum, IsOptional, IsString, MaxLength } from 'class-validator';
 import { UserRole } from '../../../entities/user.entity';
 
 export class UpdateUserDto {
+  @ApiPropertyOptional({ example: 'Mahdi', nullable: true })
+  @IsOptional()
+  @IsString()
+  @MaxLength(150)
   fullName?: string | null;
+
+  @ApiPropertyOptional({ enum: UserRole, example: UserRole.BUSINESS_OWNER })
+  @IsOptional()
+  @IsEnum(UserRole)
   role?: UserRole;
+
+  @ApiPropertyOptional({ example: true })
+  @IsOptional()
+  @IsBoolean()
   isActive?: boolean;
 }