diff --git a/BE/package-lock.json b/BE/package-lock.json
index aa4bab0e..dc208c9c 100644
--- a/BE/package-lock.json
+++ b/BE/package-lock.json
@@ -17,6 +17,7 @@
         "@nestjs/typeorm": "^10.0.2",
         "axios": "^1.7.7",
         "bcrypt": "^5.1.1",
+        "class-transformer": "^0.5.1",
         "cross-env": "^7.0.3",
         "docker": "^1.0.0",
         "dotenv": "^16.4.5",
@@ -36,6 +37,7 @@
         "@types/jest": "^29.5.2",
         "@types/node": "^20.3.1",
         "@types/supertest": "^6.0.0",
+        "class-validator": "^0.14.1",
         "eslint": "^8.0.0",
         "eslint-config-airbnb-base": "^15.0.0",
         "eslint-config-airbnb-typescript": "^18.0.0",
@@ -2144,6 +2146,13 @@
         "@types/superagent": "^8.1.0"
       }
     },
+    "node_modules/@types/validator": {
+      "version": "13.12.2",
+      "resolved": "https://registry.npmjs.org/@types/validator/-/validator-13.12.2.tgz",
+      "integrity": "sha512-6SlHBzUW8Jhf3liqrGGXyTJSIFe4nqlJ5A5KaMZ2l/vbM3Wh3KSybots/wfWVzNLK4D1NZluDlSQIbIEPx6oyA==",
+      "devOptional": true,
+      "license": "MIT"
+    },
     "node_modules/@types/yargs": {
       "version": "17.0.33",
       "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-17.0.33.tgz",
@@ -3573,6 +3582,24 @@
       "integrity": "sha512-cuSVIHi9/9E/+821Qjdvngor+xpnlwnuwIyZOaLmHBVdXL+gP+I6QQB9VkO7RI77YIcTV+S1W9AreJ5eN63JBA==",
       "dev": true
     },
+    "node_modules/class-transformer": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/class-transformer/-/class-transformer-0.5.1.tgz",
+      "integrity": "sha512-SQa1Ws6hUbfC98vKGxZH3KFY0Y1lm5Zm0SY8XX9zbK7FJCyVEac3ATW0RIpwzW+oOfmHE5PMPufDG9hCfoEOMw==",
+      "license": "MIT"
+    },
+    "node_modules/class-validator": {
+      "version": "0.14.1",
+      "resolved": "https://registry.npmjs.org/class-validator/-/class-validator-0.14.1.tgz",
+      "integrity": "sha512-2VEG9JICxIqTpoK1eMzZqaV+u/EiwEJkMGzTrZf6sU/fwsnOITVgYJ8yojSy6CaXtO9V0Cc6ZQZ8h8m4UBuLwQ==",
+      "devOptional": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/validator": "^13.11.8",
+        "libphonenumber-js": "^1.10.53",
+        "validator": "^13.9.0"
+      }
+    },
     "node_modules/cli-cursor": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
@@ -8098,6 +8125,13 @@
         "node": ">= 0.8.0"
       }
     },
+    "node_modules/libphonenumber-js": {
+      "version": "1.11.12",
+      "resolved": "https://registry.npmjs.org/libphonenumber-js/-/libphonenumber-js-1.11.12.tgz",
+      "integrity": "sha512-QkJn9/D7zZ1ucvT++TQSvZuSA2xAWeUytU+DiEQwbPKLyrDpvbul2AFs1CGbRAPpSCCk47aRAb5DX5mmcayp4g==",
+      "devOptional": true,
+      "license": "MIT"
+    },
     "node_modules/lines-and-columns": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/lines-and-columns/-/lines-and-columns-1.2.4.tgz",
@@ -11687,6 +11721,16 @@
         "node": ">=10.12.0"
       }
     },
+    "node_modules/validator": {
+      "version": "13.12.0",
+      "resolved": "https://registry.npmjs.org/validator/-/validator-13.12.0.tgz",
+      "integrity": "sha512-c1Q0mCiPlgdTVVVIJIrBuxNicYE+t/7oKeI9MWLj3fh/uq2Pxh/3eeWbVZ4OcGW1TUf53At0njHw5SMdA3tmMg==",
+      "devOptional": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
     "node_modules/vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
@@ -13628,6 +13672,12 @@
         "@types/superagent": "^8.1.0"
       }
     },
+    "@types/validator": {
+      "version": "13.12.2",
+      "resolved": "https://registry.npmjs.org/@types/validator/-/validator-13.12.2.tgz",
+      "integrity": "sha512-6SlHBzUW8Jhf3liqrGGXyTJSIFe4nqlJ5A5KaMZ2l/vbM3Wh3KSybots/wfWVzNLK4D1NZluDlSQIbIEPx6oyA==",
+      "devOptional": true
+    },
     "@types/yargs": {
       "version": "17.0.33",
       "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-17.0.33.tgz",
@@ -14638,6 +14688,22 @@
       "integrity": "sha512-cuSVIHi9/9E/+821Qjdvngor+xpnlwnuwIyZOaLmHBVdXL+gP+I6QQB9VkO7RI77YIcTV+S1W9AreJ5eN63JBA==",
       "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": "0.14.1",
+      "resolved": "https://registry.npmjs.org/class-validator/-/class-validator-0.14.1.tgz",
+      "integrity": "sha512-2VEG9JICxIqTpoK1eMzZqaV+u/EiwEJkMGzTrZf6sU/fwsnOITVgYJ8yojSy6CaXtO9V0Cc6ZQZ8h8m4UBuLwQ==",
+      "devOptional": true,
+      "requires": {
+        "@types/validator": "^13.11.8",
+        "libphonenumber-js": "^1.10.53",
+        "validator": "^13.9.0"
+      }
+    },
     "cli-cursor": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
@@ -17896,6 +17962,12 @@
         "type-check": "~0.4.0"
       }
     },
+    "libphonenumber-js": {
+      "version": "1.11.12",
+      "resolved": "https://registry.npmjs.org/libphonenumber-js/-/libphonenumber-js-1.11.12.tgz",
+      "integrity": "sha512-QkJn9/D7zZ1ucvT++TQSvZuSA2xAWeUytU+DiEQwbPKLyrDpvbul2AFs1CGbRAPpSCCk47aRAb5DX5mmcayp4g==",
+      "devOptional": true
+    },
     "lines-and-columns": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/lines-and-columns/-/lines-and-columns-1.2.4.tgz",
@@ -20362,6 +20434,12 @@
         "convert-source-map": "^2.0.0"
       }
     },
+    "validator": {
+      "version": "13.12.0",
+      "resolved": "https://registry.npmjs.org/validator/-/validator-13.12.0.tgz",
+      "integrity": "sha512-c1Q0mCiPlgdTVVVIJIrBuxNicYE+t/7oKeI9MWLj3fh/uq2Pxh/3eeWbVZ4OcGW1TUf53At0njHw5SMdA3tmMg==",
+      "devOptional": true
+    },
     "vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
diff --git a/BE/package.json b/BE/package.json
index 68b80c18..4bcb6550 100644
--- a/BE/package.json
+++ b/BE/package.json
@@ -28,6 +28,7 @@
     "@nestjs/typeorm": "^10.0.2",
     "axios": "^1.7.7",
     "bcrypt": "^5.1.1",
+    "class-transformer": "^0.5.1",
     "cross-env": "^7.0.3",
     "docker": "^1.0.0",
     "dotenv": "^16.4.5",
@@ -47,6 +48,7 @@
     "@types/jest": "^29.5.2",
     "@types/node": "^20.3.1",
     "@types/supertest": "^6.0.0",
+    "class-validator": "^0.14.1",
     "eslint": "^8.0.0",
     "eslint-config-airbnb-base": "^15.0.0",
     "eslint-config-airbnb-typescript": "^18.0.0",
diff --git a/BE/src/auth/auth.controller.ts b/BE/src/auth/auth.controller.ts
index 1afa4282..2241e481 100644
--- a/BE/src/auth/auth.controller.ts
+++ b/BE/src/auth/auth.controller.ts
@@ -1,4 +1,4 @@
-import { Controller, Post, Body } from '@nestjs/common';
+import { Controller, Post, Body, ValidationPipe } from '@nestjs/common';
 import { AuthService } from './auth.service';
 import { AuthCredentialsDto } from './dto/authCredentials.dto';
 
@@ -7,7 +7,7 @@ export class AuthController {
   constructor(private authService: AuthService) {}
 
   @Post('/signup')
-  signUp(@Body() authCredentialsDto: AuthCredentialsDto) {
+  signUp(@Body(ValidationPipe) authCredentialsDto: AuthCredentialsDto) {
     return this.authService.signUp(authCredentialsDto);
   }
 }
diff --git a/BE/src/auth/dto/authCredentials.dto.ts b/BE/src/auth/dto/authCredentials.dto.ts
index 6a4a6569..d8e67287 100644
--- a/BE/src/auth/dto/authCredentials.dto.ts
+++ b/BE/src/auth/dto/authCredentials.dto.ts
@@ -1,4 +1,13 @@
+import { IsString, Matches, MaxLength, MinLength } from 'class-validator';
 export class AuthCredentialsDto {
+  @IsString()
+  @MinLength(4)
+  @MaxLength(20)
   email: string;
+
+  @IsString()
+  @MinLength(4)
+  @MaxLength(20)
+  @Matches(/^[a-zA-Z0-9]*$/)
   password: string;
 }