diff --git a/.firebaserc b/.firebaserc
new file mode 100644
index 0000000..c1b75c8
--- /dev/null
+++ b/.firebaserc
@@ -0,0 +1,5 @@
+{
+  "projects": {
+    "default": "auth-20a66"
+  }
+}
diff --git a/database.rules.json b/database.rules.json
new file mode 100644
index 0000000..f54493d
--- /dev/null
+++ b/database.rules.json
@@ -0,0 +1,7 @@
+{
+  /* Visit https://firebase.google.com/docs/database/security to learn more about security rules. */
+  "rules": {
+    ".read": false,
+    ".write": false
+  }
+}
\ No newline at end of file
diff --git a/firebase.json b/firebase.json
new file mode 100644
index 0000000..b6a1b1b
--- /dev/null
+++ b/firebase.json
@@ -0,0 +1,5 @@
+{
+  "database": {
+    "rules": "database.rules.json"
+  }
+}
diff --git a/package-lock.json b/package-lock.json
index e3946f1..6804330 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2461,6 +2461,16 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@js-sdsl/ordered-map": {
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+      "resolved": "https://registry.npmjs.org/@js-sdsl/ordered-map/-/ordered-map-4.4.2.tgz",
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+      "funding": {
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@@ -2786,6 +2796,60 @@
         "url": "https://opencollective.com/unts"
       }
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+      "resolved": "https://registry.npmjs.org/@protobufjs/aspromise/-/aspromise-1.1.2.tgz",
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+    },
+    "node_modules/@protobufjs/codegen": {
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+      "resolved": "https://registry.npmjs.org/@protobufjs/codegen/-/codegen-2.0.4.tgz",
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+    "node_modules/@protobufjs/eventemitter": {
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+      "resolved": "https://registry.npmjs.org/@protobufjs/eventemitter/-/eventemitter-1.1.0.tgz",
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+    },
+    "node_modules/@protobufjs/fetch": {
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+      "resolved": "https://registry.npmjs.org/@protobufjs/fetch/-/fetch-1.1.0.tgz",
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+      "dependencies": {
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+        "@protobufjs/inquire": "^1.1.0"
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+    },
+    "node_modules/@protobufjs/float": {
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+      "resolved": "https://registry.npmjs.org/@protobufjs/float/-/float-1.0.2.tgz",
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+      "resolved": "https://registry.npmjs.org/@protobufjs/inquire/-/inquire-1.1.0.tgz",
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+    },
+    "node_modules/@protobufjs/path": {
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+      "resolved": "https://registry.npmjs.org/@protobufjs/path/-/path-1.1.2.tgz",
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+      "resolved": "https://registry.npmjs.org/@protobufjs/pool/-/pool-1.1.0.tgz",
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+    },
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@@ -2813,6 +2877,15 @@
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       }
     },
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+      "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-2.0.0.tgz",
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-      "dev": true,
       "license": "MIT",
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+      "version": "0.12.5",
+      "resolved": "https://registry.npmjs.org/@types/caseless/-/caseless-0.12.5.tgz",
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@@ -3571,6 +3640,18 @@
       "dev": true,
       "license": "Apache-2.0"
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+    "node_modules/abort-controller": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/abort-controller/-/abort-controller-3.0.0.tgz",
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@@ -3624,6 +3705,18 @@
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+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-7.1.1.tgz",
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@@ -4181,6 +4274,15 @@
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@@ -4371,6 +4473,11 @@
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@@ -5569,6 +5676,15 @@
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@@ -6801,6 +6917,15 @@
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@@ -6953,6 +7084,14 @@
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+      "funding": [
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+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        },
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+          "type": "paypal",
+          "url": "https://paypal.me/naturalintelligence"
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@@ -7013,6 +7174,17 @@
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@@ -7617,6 +7789,72 @@
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       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
-      "dev": true,
+      "devOptional": true,
       "license": "ISC"
     },
     "node_modules/write-file-atomic": {
@@ -14168,7 +14664,7 @@
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
       "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
-      "dev": true,
+      "devOptional": true,
       "license": "MIT",
       "engines": {
         "node": ">=10"
diff --git a/src/app.controller.spec.ts b/src/app.controller.spec.ts
new file mode 100644
index 0000000..aec925a
--- /dev/null
+++ b/src/app.controller.spec.ts
@@ -0,0 +1,18 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { AppController } from './app.controller';
+
+describe('AppController', () => {
+  let controller: AppController;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [AppController],
+    }).compile();
+
+    controller = module.get<AppController>(AppController);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+});
diff --git a/src/app.controller.ts b/src/app.controller.ts
new file mode 100644
index 0000000..a7f975d
--- /dev/null
+++ b/src/app.controller.ts
@@ -0,0 +1,11 @@
+import { Controller, Get, UseGuards, Request } from '@nestjs/common';
+import { AuthGuard } from './auth/auth.guard';
+
+@Controller()
+export class AppController {
+  @Get('protected')
+  @UseGuards(AuthGuard)
+  getProtected(@Request() req): string {
+    return `Hello ${req.user.name}`;
+  }
+}
diff --git a/src/app.module.ts b/src/app.module.ts
index a355ba9..7042498 100644
--- a/src/app.module.ts
+++ b/src/app.module.ts
@@ -2,9 +2,16 @@ import { Logger, Module } from '@nestjs/common';
 import { ConfigModule, ConfigService } from '@nestjs/config';
 import { MongooseModule } from '@nestjs/mongoose';
 import { getMongoConnectionString } from './libs';
+import { MongooseModule } from '@nestjs/mongoose';
+import { AppController } from './app.controller';
+import { AuthModule } from './auth/auth.module';
+import { AppService } from './app.service';
 
 @Module({
   imports: [
+    MongooseModule.forRoot('mongodb://localhost/nest'),
+    AuthModule,
+  
     ConfigModule.forRoot({
       envFilePath: ['.env.local', '.env'],
       isGlobal: true,
@@ -17,7 +24,7 @@ import { getMongoConnectionString } from './libs';
       }),
     }),
   ],
-  controllers: [],
-  providers: [Logger],
+  controllers: [AppController],
+  providers: [LoggerAppService]
 })
 export class AppModule {}
diff --git a/src/app.service.ts b/src/app.service.ts
new file mode 100644
index 0000000..1cdab92
--- /dev/null
+++ b/src/app.service.ts
@@ -0,0 +1,8 @@
+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class AppService {
+  getHello(): string {
+    return 'Hello World!';
+  }
+}
\ No newline at end of file
diff --git a/src/auth/auth.controller.spec.ts b/src/auth/auth.controller.spec.ts
new file mode 100644
index 0000000..27a31e6
--- /dev/null
+++ b/src/auth/auth.controller.spec.ts
@@ -0,0 +1,18 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { AuthController } from './auth.controller';
+
+describe('AuthController', () => {
+  let controller: AuthController;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [AuthController],
+    }).compile();
+
+    controller = module.get<AuthController>(AuthController);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+});
diff --git a/src/auth/auth.controller.ts b/src/auth/auth.controller.ts
new file mode 100644
index 0000000..268eeb2
--- /dev/null
+++ b/src/auth/auth.controller.ts
@@ -0,0 +1,4 @@
+import { Controller } from '@nestjs/common';
+
+@Controller('auth')
+export class AuthController {}
diff --git a/src/auth/auth.guard.ts b/src/auth/auth.guard.ts
new file mode 100644
index 0000000..3bd307f
--- /dev/null
+++ b/src/auth/auth.guard.ts
@@ -0,0 +1,26 @@
+import { Injectable, CanActivate, ExecutionContext, UnauthorizedException } from '@nestjs/common';
+import { AuthService } from './auth.service';
+
+@Injectable()
+export class AuthGuard implements CanActivate {
+  constructor(private readonly authService: AuthService) {}
+
+  async canActivate(context: ExecutionContext): Promise<boolean> {
+    const request = context.switchToHttp().getRequest();
+    const token = request.headers.authorization?.split(' ')[1];
+  
+    if (!token) {
+      console.error('No token provided'); 
+      throw new UnauthorizedException('No token');
+    }
+  
+    try {
+      const decodedToken = await this.authService.verifyToken(token);
+      request.user = decodedToken;
+      return true;
+    } catch (error) {
+      console.error('Token verification failed:', error); 
+      throw new UnauthorizedException('Invalid token');
+    }
+  }
+}  
diff --git a/src/auth/auth.module.ts b/src/auth/auth.module.ts
new file mode 100644
index 0000000..d77ffa5
--- /dev/null
+++ b/src/auth/auth.module.ts
@@ -0,0 +1,15 @@
+import { Module } from '@nestjs/common';
+import { MongooseModule } from '@nestjs/mongoose';
+import { AuthService } from './auth.service';
+import { AuthController } from './auth.controller';
+import { User, UserSchema } from '../schemas/user.schema';
+import { AuthGuard } from './auth.guard'; 
+
+
+@Module({
+  imports: [MongooseModule.forFeature([{ name: User.name, schema: UserSchema }])],
+  providers: [AuthService, AuthGuard],
+  controllers: [AuthController],
+  exports: [AuthService],
+})
+export class AuthModule {}
diff --git a/src/auth/auth.service.spec.ts b/src/auth/auth.service.spec.ts
new file mode 100644
index 0000000..800ab66
--- /dev/null
+++ b/src/auth/auth.service.spec.ts
@@ -0,0 +1,18 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { AuthService } from './auth.service';
+
+describe('AuthService', () => {
+  let service: AuthService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [AuthService],
+    }).compile();
+
+    service = module.get<AuthService>(AuthService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});
diff --git a/src/auth/auth.service.ts b/src/auth/auth.service.ts
new file mode 100644
index 0000000..ced9427
--- /dev/null
+++ b/src/auth/auth.service.ts
@@ -0,0 +1,35 @@
+import { Injectable, UnauthorizedException } from '@nestjs/common';
+import * as admin from 'firebase-admin';
+import { InjectModel } from '@nestjs/mongoose';
+import { Model } from 'mongoose';
+import { User } from '../schemas/user.schema';
+
+@Injectable()
+export class AuthService {
+  constructor(@InjectModel(User.name) private userModel: Model<User>) {}
+
+  async verifyToken(token: string): Promise<any> {
+    try {
+      const decodedToken = await admin.auth().verifyIdToken(token);
+      await this.storeToken(decodedToken.uid, token);
+      return decodedToken;
+    } catch (error) {
+      throw new UnauthorizedException('Invalid token');
+    }
+  }
+
+  private async storeToken(uid: string, token: string): Promise<void> {
+    const user = await this.userModel.findOne({ uid });
+
+    if (user) {
+      user.tokens.push(token);
+      await user.save();
+    } else {
+      const newUser = new this.userModel({
+        uid,
+        tokens: [token],
+      });
+      await newUser.save();
+    }
+  }
+}
diff --git a/src/components/loginButton.js b/src/components/loginButton.js
new file mode 100644
index 0000000..e95526a
--- /dev/null
+++ b/src/components/loginButton.js
@@ -0,0 +1,30 @@
+import React from 'react';
+import firebase from '../config/firebaseConfig';
+
+const LoginButton = () => {
+  const handleLogin = async () => {
+    try {
+      const provider = new firebase.auth.GoogleAuthProvider();
+      const result = await firebase.auth().signInWithPopup(provider);
+      const token = await result.user.getIdToken();
+
+      console.log('Token:', token);
+
+      const response = await fetch('http://localhost:3000/protected', {
+        method: 'GET',
+        headers: {
+          Authorization: `Bearer ${token}`,
+        },
+      });
+
+      const data = await response.text();
+      console.log('Protected data:', data);
+    } catch (error) {
+      console.error('Error logging in:', error.message);
+    }
+  };
+
+  return <button onClick={handleLogin}>Zaloguj się przez Google</button>;
+};
+
+export default LoginButton;
diff --git a/src/config/firebaseConfig.js b/src/config/firebaseConfig.js
new file mode 100644
index 0000000..8e1f3a3
--- /dev/null
+++ b/src/config/firebaseConfig.js
@@ -0,0 +1,15 @@
+import { initializeApp } from "firebase/app";
+import { getAnalytics } from "firebase/analytics";
+
+const firebaseConfig = {
+  apiKey: "AIzaSyBcaalyPESHwdg_Gq7ezuXJKC-p9KndztU",
+  authDomain: "auth-20a66.firebaseapp.com",
+  projectId: "auth-20a66",
+  storageBucket: "auth-20a66.appspot.com",
+  messagingSenderId: "323908200672",    
+  appId: "1:323908200672:web:ceb3ebe36816038fc00885",
+  measurementId: "G-C6FZWMPVCW"
+};
+
+const app = initializeApp(firebaseConfig);
+const analytics = getAnalytics(app);
\ No newline at end of file
diff --git a/src/main.ts b/src/main.ts
index d2f871f..1bbb8a9 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,11 +1,23 @@
 import { ValidationPipe } from '@nestjs/common';
 import { NestFactory } from '@nestjs/core';
 import { AppModule } from './app.module';
+import * as admin from 'firebase-admin';
+import * as dotenv from 'dotenv';
 import { HttpExceptionFilter } from './libs';
 import { WinstonModule } from 'nest-winston';
 import { WinstonLogger } from 'src/libs/internal/winston.logger';
 
 async function bootstrap(): Promise<void> {
+  dotenv.config(); 
+
+  admin.initializeApp({
+    credential: admin.credential.cert({
+      projectId: process.env.PROJECT_ID,
+      clientEmail: process.env.CLIENT_EMAIL,
+      privateKey: process.env.PRIVATE_KEY.replace(/\\n/g, '\n'),
+    }),
+  });
+
   const app = await NestFactory.create(AppModule, {
     logger: WinstonModule.createLogger({
       instance: WinstonLogger,
diff --git a/src/schemas/user.schema.ts b/src/schemas/user.schema.ts
new file mode 100644
index 0000000..f69466e
--- /dev/null
+++ b/src/schemas/user.schema.ts
@@ -0,0 +1,19 @@
+import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose';
+import { Document } from 'mongoose';
+
+@Schema()
+export class User extends Document {
+  @Prop({ required: true })
+  uid: string;
+
+  @Prop()
+  name: string;
+
+  @Prop()
+  email: string;
+
+  @Prop()
+  tokens: string[];
+}
+
+export const UserSchema = SchemaFactory.createForClass(User);
diff --git a/tsconfig.json b/tsconfig.json
index 95f5641..0848507 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -16,6 +16,9 @@
     "noImplicitAny": false,
     "strictBindCallApply": false,
     "forceConsistentCasingInFileNames": false,
-    "noFallthroughCasesInSwitch": false
+    "noFallthroughCasesInSwitch": false,
+    "resolveJsonModule": true,
+    "esModuleInterop": true
+
   }
 }