first push

.eslintrc.js

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+module.exports = {
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    project: 'tsconfig.json',
+    tsconfigRootDir: __dirname,
+    sourceType: 'module',
+  },
+  plugins: ['@typescript-eslint/eslint-plugin'],
+  extends: [
+    'plugin:@typescript-eslint/recommended',
+    'plugin:prettier/recommended',
+  ],
+  root: true,
+  env: {
+    node: true,
+    jest: true,
+  },
+  ignorePatterns: ['.eslintrc.js'],
+  rules: {
+    '@typescript-eslint/interface-name-prefix': 'off',
+    '@typescript-eslint/explicit-function-return-type': 'off',
+    '@typescript-eslint/explicit-module-boundary-types': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+  },
+};

.gitignore

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+node_modules
+dist
+.idea

.prettierrc

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+{
+  "singleQuote": true,
+  "trailingComma": "all"
+}

nest-cli.json

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+{
+  "$schema": "https://json.schemastore.org/nest-cli",
+  "collection": "@nestjs/schematics",
+  "sourceRoot": "src",
+  "compilerOptions": {
+    "deleteOutDir": true
+  }
+}

package.json

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+{
+  "name": "seo-tools-api",
+  "version": "0.0.1",
+  "description": "",
+  "author": "",
+  "private": true,
+  "license": "UNLICENSED",
+  "scripts": {
+    "build": "nest build",
+    "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
+    "start": "nest start",
+    "start:dev": "nest start --watch",
+    "start:debug": "nest start --debug --watch",
+    "start:prod": "node dist/main",
+    "lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:cov": "jest --coverage",
+    "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
+    "test:e2e": "jest --config ./test/jest-e2e.json"
+  },
+  "dependencies": {
+    "@nestjs/common": "^9.0.0",
+    "@nestjs/core": "^9.0.0",
+    "@nestjs/platform-express": "^9.0.0",
+    "@nestjs/swagger": "^7.4.0",
+    "axios": "^1.7.2",
+    "cheerio": "^1.0.0-rc.12",
+    "reflect-metadata": "^0.1.13",
+    "rxjs": "^7.2.0",
+    "serpapi": "^2.1.0",
+    "swagger-ui-express": "^5.0.1"
+  },
+  "devDependencies": {
+    "@nestjs/cli": "^9.0.0",
+    "@nestjs/schematics": "^9.0.0",
+    "@nestjs/testing": "^9.0.0",
+    "@types/express": "^4.17.13",
+    "@types/jest": "29.5.0",
+    "@types/node": "18.15.11",
+    "@types/supertest": "^2.0.11",
+    "@typescript-eslint/eslint-plugin": "^5.0.0",
+    "@typescript-eslint/parser": "^5.0.0",
+    "eslint": "^8.0.1",
+    "eslint-config-prettier": "^8.3.0",
+    "eslint-plugin-prettier": "^4.0.0",
+    "jest": "29.5.0",
+    "prettier": "^2.3.2",
+    "source-map-support": "^0.5.20",
+    "supertest": "^6.1.3",
+    "ts-jest": "29.0.5",
+    "ts-loader": "^9.2.3",
+    "ts-node": "^10.0.0",
+    "tsconfig-paths": "4.2.0",
+    "typescript": "^4.7.4"
+  },
+  "jest": {
+    "moduleFileExtensions": [
+      "js",
+      "json",
+      "ts"
+    ],
+    "rootDir": "src",
+    "testRegex": ".*\\.spec\\.ts$",
+    "transform": {
+      "^.+\\.(t|j)s$": "ts-jest"
+    },
+    "collectCoverageFrom": [
+      "**/*.(t|j)s"
+    ],
+    "coverageDirectory": "../coverage",
+    "testEnvironment": "node"
+  }
+}

src/app.module.ts

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+import { Module } from '@nestjs/common';
+import { BacklinkCheckerModule } from './backlink-checker/backlink-checker.module';
+import { RankCheckerModule } from './rank-checker/rank-checker.module';
+import { SeoAuditModule } from './seo-audit/seo-audit.module';
+import { SitemapGeneratorModule } from './sitemap-generator/sitemap-generator.module';
+import { CompetitorAnalysisModule } from './competitor-analysis/competitor-analysis.module';
+import { PageSpeedAnalyzerModule } from './page-speed-analyzer/page-speed-analyzer.module';
+import { ContentOptimizationModule } from './content-optimization/content-optimization.module';
+import { InternalLinkingModule } from './internal-linking/internal-linking.module';
+import { SocialMediaIntegrationModule } from './social-media-integration/social-media-integration.module';
+
+@Module({
+  imports: [
+    BacklinkCheckerModule,
+    RankCheckerModule,
+    SeoAuditModule,
+    SitemapGeneratorModule,
+    CompetitorAnalysisModule,
+    PageSpeedAnalyzerModule,
+    ContentOptimizationModule,
+    InternalLinkingModule,
+    SocialMediaIntegrationModule,
+  ],
+})
+export class AppModule {}

src/backlink-checker/backlink-checker.controller.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { BacklinkCheckerController } from './backlink-checker.controller';
+
+describe('BacklinkCheckerController', () => {
+  let controller: BacklinkCheckerController;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [BacklinkCheckerController],
+    }).compile();
+
+    controller = module.get<BacklinkCheckerController>(BacklinkCheckerController);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+});

src/backlink-checker/backlink-checker.controller.ts

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+import { Controller, Get, Query } from '@nestjs/common';
+import { BacklinkCheckerService } from './backlink-checker.service';
+import { ApiTags, ApiOperation, ApiQuery } from '@nestjs/swagger';
+
+@ApiTags('backlink-checker')
+@Controller('backlink-checker')
+export class BacklinkCheckerController {
+  constructor(public readonly backlinkCheckerService: BacklinkCheckerService) {}
+
+  @Get()
+  @ApiOperation({ summary: 'Check backlinks of a given website' })
+  @ApiQuery({
+    name: 'url',
+    required: true,
+    description: 'Website URL to check for backlinks',
+  })
+  async getBacklinks(@Query('url') url: string): Promise<string[]> {
+    return this.backlinkCheckerService.checkBacklinks(url);
+  }
+}

src/backlink-checker/backlink-checker.module.ts

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+import { Module } from '@nestjs/common';
+import { BacklinkCheckerService } from './backlink-checker.service';
+import { BacklinkCheckerController } from './backlink-checker.controller';
+
+@Module({
+  providers: [BacklinkCheckerService],
+  controllers: [BacklinkCheckerController],
+})
+export class BacklinkCheckerModule {}

src/backlink-checker/backlink-checker.service.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { BacklinkCheckerService } from './backlink-checker.service';
+
+describe('BacklinkCheckerService', () => {
+  let service: BacklinkCheckerService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [BacklinkCheckerService],
+    }).compile();
+
+    service = module.get<BacklinkCheckerService>(BacklinkCheckerService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});

src/backlink-checker/backlink-checker.service.ts

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+import { Injectable } from '@nestjs/common';
+import axios from 'axios';
+import * as cheerio from 'cheerio';
+
+@Injectable()
+export class BacklinkCheckerService {
+  async checkBacklinks(url: string): Promise<string[]> {
+    try {
+      const { data } = await axios.get(url);
+      const $ = cheerio.load(data);
+      const backlinks = [];
+
+      $('a').each((index, element) => {
+        const link = $(element).attr('href');
+        if (link) {
+          backlinks.push(link);
+        }
+      });
+
+      return backlinks;
+    } catch (error) {
+      throw new Error('Error fetching backlinks');
+    }
+  }
+}

src/competitor-analysis/competitor-analysis.controller.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { CompetitorAnalysisController } from './competitor-analysis.controller';
+
+describe('CompetitorAnalysisController', () => {
+  let controller: CompetitorAnalysisController;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [CompetitorAnalysisController],
+    }).compile();
+
+    controller = module.get<CompetitorAnalysisController>(CompetitorAnalysisController);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+});

src/competitor-analysis/competitor-analysis.controller.ts

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+import { Controller, Get, Query } from '@nestjs/common';
+import { CompetitorAnalysisService } from './competitor-analysis.service';
+import { ApiTags, ApiOperation, ApiQuery } from '@nestjs/swagger';
+
+@ApiTags('competitor-analysis')
+@Controller('competitor-analysis')
+export class CompetitorAnalysisController {
+  constructor(
+    private readonly competitorAnalysisService: CompetitorAnalysisService,
+  ) {}
+
+  @Get()
+  @ApiOperation({
+    summary: "Analyze and compare competitor websites' SEO performance",
+  })
+  @ApiQuery({
+    name: 'urls',
+    required: true,
+    description: 'Comma-separated list of competitor URLs to analyze',
+  })
+  @ApiQuery({
+    name: 'keyword',
+    required: true,
+    description: 'Keyword to check the rank against',
+  })
+  async analyze(
+    @Query('urls') urls: string,
+    @Query('keyword') keyword: string,
+  ): Promise<any> {
+    const urlList = urls.split(',');
+    return this.competitorAnalysisService.analyze(urlList, keyword);
+  }
+}

src/competitor-analysis/competitor-analysis.module.ts

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+import { Module } from '@nestjs/common';
+import { CompetitorAnalysisService } from './competitor-analysis.service';
+import { CompetitorAnalysisController } from './competitor-analysis.controller';
+
+@Module({
+  providers: [CompetitorAnalysisService],
+  controllers: [CompetitorAnalysisController]
+})
+export class CompetitorAnalysisModule {}

src/competitor-analysis/competitor-analysis.service.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { CompetitorAnalysisService } from './competitor-analysis.service';
+
+describe('CompetitorAnalysisService', () => {
+  let service: CompetitorAnalysisService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [CompetitorAnalysisService],
+    }).compile();
+
+    service = module.get<CompetitorAnalysisService>(CompetitorAnalysisService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});

src/competitor-analysis/competitor-analysis.service.ts

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+import { Injectable } from '@nestjs/common';
+import axios from 'axios';
+import * as cheerio from 'cheerio';
+
+@Injectable()
+export class CompetitorAnalysisService {
+  async getRank(url: string, keyword: string): Promise<number> {
+    try {
+      const searchUrl = `https://www.google.com/search?q=${encodeURIComponent(
+        keyword,
+      )}`;
+      const { data } = await axios.get(searchUrl);
+      const $ = cheerio.load(data);
+      let rank = -1;
+
+      $('a').each((index, element) => {
+        const link = $(element).attr('href');
+        if (link && link.includes(url)) {
+          rank = index + 1;
+          return false;
+        }
+      });
+
+      return rank;
+    } catch (error) {
+      throw new Error(`Error fetching rank data for ${url}`);
+    }
+  }
+
+  async analyze(urls: string[], keyword: string): Promise<any> {
+    const results = [];
+
+    for (const url of urls) {
+      const rank = await this.getRank(url, keyword);
+      results.push({ url, rank });
+    }
+
+    return results;
+  }
+}

src/content-optimization/content-optimization.controller.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { ContentOptimizationController } from './content-optimization.controller';
+
+describe('ContentOptimizationController', () => {
+  let controller: ContentOptimizationController;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [ContentOptimizationController],
+    }).compile();
+
+    controller = module.get<ContentOptimizationController>(ContentOptimizationController);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+});