init

.eslintrc.js

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

.gitignore

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+# compiled output
+/dist
+/node_modules
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# OS
+.DS_Store
+
+# Tests
+/coverage
+/.nyc_output
+
+# IDEs and editors
+/.idea
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# IDE - VSCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json

.prettierrc

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

README.md

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+<p align="center">
+  <a href="http://nestjs.com/" target="blank"><img src="https://nestjs.com/img/logo_text.svg" width="320" alt="Nest Logo" /></a>
+</p>
+
+[travis-image]: https://api.travis-ci.org/nestjs/nest.svg?branch=master
+[travis-url]: https://travis-ci.org/nestjs/nest
+[linux-image]: https://img.shields.io/travis/nestjs/nest/master.svg?label=linux
+[linux-url]: https://travis-ci.org/nestjs/nest
+  
+  <p align="center">A progressive <a href="http://nodejs.org" target="blank">Node.js</a> framework for building efficient and scalable server-side applications, heavily inspired by <a href="https://angular.io" target="blank">Angular</a>.</p>
+    <p align="center">
+<a href="https://www.npmjs.com/~nestjscore"><img src="https://img.shields.io/npm/v/@nestjs/core.svg" alt="NPM Version" /></a>
+<a href="https://www.npmjs.com/~nestjscore"><img src="https://img.shields.io/npm/l/@nestjs/core.svg" alt="Package License" /></a>
+<a href="https://www.npmjs.com/~nestjscore"><img src="https://img.shields.io/npm/dm/@nestjs/core.svg" alt="NPM Downloads" /></a>
+<a href="https://travis-ci.org/nestjs/nest"><img src="https://api.travis-ci.org/nestjs/nest.svg?branch=master" alt="Travis" /></a>
+<a href="https://travis-ci.org/nestjs/nest"><img src="https://img.shields.io/travis/nestjs/nest/master.svg?label=linux" alt="Linux" /></a>
+<a href="https://coveralls.io/github/nestjs/nest?branch=master"><img src="https://coveralls.io/repos/github/nestjs/nest/badge.svg?branch=master#5" alt="Coverage" /></a>
+<a href="https://gitter.im/nestjs/nestjs?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=body_badge"><img src="https://badges.gitter.im/nestjs/nestjs.svg" alt="Gitter" /></a>
+<a href="https://opencollective.com/nest#backer"><img src="https://opencollective.com/nest/backers/badge.svg" alt="Backers on Open Collective" /></a>
+<a href="https://opencollective.com/nest#sponsor"><img src="https://opencollective.com/nest/sponsors/badge.svg" alt="Sponsors on Open Collective" /></a>
+  <a href="https://paypal.me/kamilmysliwiec"><img src="https://img.shields.io/badge/Donate-PayPal-dc3d53.svg"/></a>
+  <a href="https://twitter.com/nestframework"><img src="https://img.shields.io/twitter/follow/nestframework.svg?style=social&label=Follow"></a>
+</p>
+  <!--[![Backers on Open Collective](https://opencollective.com/nest/backers/badge.svg)](https://opencollective.com/nest#backer)
+  [![Sponsors on Open Collective](https://opencollective.com/nest/sponsors/badge.svg)](https://opencollective.com/nest#sponsor)-->
+
+## Description
+
+[Nest](https://github.com/nestjs/nest) framework TypeScript starter repository.
+
+## Installation
+
+```bash
+$ npm install
+```
+
+## Running the app
+
+```bash
+# development
+$ npm run start
+
+# watch mode
+$ npm run start:dev
+
+# production mode
+$ npm run start:prod
+```
+
+## Test
+
+```bash
+# unit tests
+$ npm run test
+
+# e2e tests
+$ npm run test:e2e
+
+# test coverage
+$ npm run test:cov
+```
+
+## Support
+
+Nest is an MIT-licensed open source project. It can grow thanks to the sponsors and support by the amazing backers. If you'd like to join them, please [read more here](https://docs.nestjs.com/support).
+
+## Stay in touch
+
+- Author - [Kamil Myśliwiec](https://kamilmysliwiec.com)
+- Website - [https://nestjs.com](https://nestjs.com/)
+- Twitter - [@nestframework](https://twitter.com/nestframework)
+
+## License
+
+  Nest is [MIT licensed](LICENSE).

nest-cli.json

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+{
+  "collection": "@nestjs/schematics",
+  "sourceRoot": "src"
+}

package.json

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+{
+  "name": "storage-service",
+  "version": "0.0.1",
+  "description": "",
+  "author": "",
+  "private": true,
+  "license": "UNLICENSED",
+  "scripts": {
+    "prebuild": "rimraf dist",
+    "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": "^7.0.0",
+    "@nestjs/core": "^7.0.0",
+    "@nestjs/mongoose": "^7.0.1",
+    "@nestjs/platform-express": "^7.0.0",
+    "@nestjs/swagger": "^4.5.12",
+    "mongoose": "^5.9.21",
+    "reflect-metadata": "^0.1.13",
+    "rimraf": "^3.0.2",
+    "rxjs": "^6.5.4",
+    "swagger-ui-express": "^4.1.4"
+  },
+  "devDependencies": {
+    "@nestjs/cli": "^7.0.0",
+    "@nestjs/schematics": "^7.0.0",
+    "@nestjs/testing": "^7.0.0",
+    "@types/express": "^4.17.3",
+    "@types/jest": "25.2.3",
+    "@types/mongoose": "^5.7.29",
+    "@types/node": "^13.9.1",
+    "@types/supertest": "^2.0.8",
+    "@typescript-eslint/eslint-plugin": "3.0.2",
+    "@typescript-eslint/parser": "3.0.2",
+    "eslint": "7.1.0",
+    "eslint-config-prettier": "^6.10.0",
+    "eslint-plugin-import": "^2.20.1",
+    "jest": "26.0.1",
+    "prettier": "^1.19.1",
+    "supertest": "^4.0.2",
+    "ts-jest": "26.1.0",
+    "ts-loader": "^6.2.1",
+    "ts-node": "^8.6.2",
+    "tsconfig-paths": "^3.9.0",
+    "typescript": "^3.7.4"
+  },
+  "jest": {
+    "moduleFileExtensions": [
+      "js",
+      "json",
+      "ts"
+    ],
+    "rootDir": "src",
+    "testRegex": ".spec.ts$",
+    "transform": {
+      "^.+\\.(t|j)s$": "ts-jest"
+    },
+    "coverageDirectory": "../coverage",
+    "testEnvironment": "node"
+  }
+}

src/app.module.ts

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+import {Module} from '@nestjs/common';
+import {MongooseModule} from '@nestjs/mongoose';
+import {MONGO_URL} from './consts';
+import {StoreService} from './store/store.service';
+import {Store, StoreSchema} from './store/store.schema';
+import {StoreController} from './store/store.controller';
+
+@Module({
+    imports: [
+        MongooseModule.forRoot(MONGO_URL),
+        MongooseModule.forFeature([
+            {name: Store.name, schema: StoreSchema},
+        ]),
+    ],
+    controllers: [
+        StoreController,
+    ],
+    providers: [
+        StoreService,
+    ]
+})
+export class AppModule {}

src/consts.ts

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+export const DB_NAME = '/store-service';
+export const MONGO_URL = `mongodb://localhost:27017${DB_NAME}`;

src/main.ts

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+import {NestFactory} from '@nestjs/core';
+import {SwaggerModule, DocumentBuilder} from '@nestjs/swagger';
+import {AppModule} from './app.module';
+
+async function bootstrap() {
+    const app = await NestFactory.create(AppModule);
+
+    const options = new DocumentBuilder()
+    .setTitle('Store API')
+    .setDescription('API работает по принципу LocalStorage в браузере.')
+    .setVersion('1.0.0')
+    .addTag('store')
+    .build();
+
+    const document = SwaggerModule.createDocument(app, options);
+    SwaggerModule.setup('api', app, document);
+
+    await app.listen(4001);
+}
+bootstrap();

src/store/store.controller.ts

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+import { Controller, Get, Post, Body, Param } from '@nestjs/common';
+import {StoreService} from './store.service';
+import {Store, StoreParams} from './store.schema';
+
+@Controller('store')
+export class StoreController {
+    constructor(
+        private readonly storeService: StoreService
+    ) {}
+
+    @Get()
+    async findAll(): Promise<Store[]> {
+        return this.storeService.findAll();
+    }
+
+    @Get(':key?')
+    async findOne(@Param() {key}: {key: string}): Promise<Store> {
+        return this.storeService.findOne(key);
+    }
+
+    @Post()
+    async create(@Body() createStoreClass: StoreParams): Promise<Store> {
+        return this.storeService.create(createStoreClass);
+    }
+}

src/store/store.schema.ts

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+import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose';
+import { Document } from 'mongoose';
+
+export class StoreParams {
+    key: string;
+    value: any;
+}
+
+@Schema()
+export class Store extends Document {
+    @Prop({
+        required: true,
+        unique: true,
+        type: String,
+    })
+    key: string;
+
+    @Prop({
+        required: true,
+        type: {}
+    })
+    value: any;
+}
+
+export const StoreSchema = SchemaFactory.createForClass(Store);

src/store/store.service.ts

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+import {Model} from 'mongoose';
+import {Injectable} from '@nestjs/common';
+import {InjectModel} from '@nestjs/mongoose';
+import {Store, StoreParams} from './store.schema';
+
+
+@Injectable()
+export class StoreService {
+    constructor(@InjectModel(Store.name) private storeModel: Model<Store>) {}
+
+    async findAll(): Promise<Store[]> {
+        return this.storeModel.find().exec();
+    }
+
+    async create(store: StoreParams): Promise<Store> {
+        const searchStore = await this.findOne(store.key);
+        
+        if (searchStore) {
+            return searchStore.updateOne(store);
+        } else {
+            const createdStore = new this.storeModel(store);
+            return createdStore.save();
+        }
+    }
+
+    async findOne(key: string): Promise<Store> {
+        return this.storeModel.findOne({key});
+    }
+}

store.http

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+GET http://localhost:3000/store HTTP/1.1
+
+###
+
+GET http://localhost:3000/store/testApi HTTP/1.1
+
+###
+
+POST http://localhost:3000/store HTTP/1.1
+content-type: application/json
+
+{
+    "key": "testApi",
+    "value": {
+        "name": "ivan",
+        "age": 15
+    }
+}

test/app.e2e-spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { INestApplication } from '@nestjs/common';
+import * as request from 'supertest';
+import { AppModule } from './../src/app.module';
+
+describe('AppController (e2e)', () => {
+  let app: INestApplication;
+
+  beforeEach(async () => {
+    const moduleFixture: TestingModule = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+
+    app = moduleFixture.createNestApplication();
+    await app.init();
+  });
+
+  it('/ (GET)', () => {
+    return request(app.getHttpServer())
+      .get('/')
+      .expect(200)
+      .expect('Hello World!');
+  });
+});

test/jest-e2e.json

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+{
+  "moduleFileExtensions": ["js", "json", "ts"],
+  "rootDir": ".",
+  "testEnvironment": "node",
+  "testRegex": ".e2e-spec.ts$",
+  "transform": {
+    "^.+\\.(t|j)s$": "ts-jest"
+  }
+}

tsconfig.build.json

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+{
+  "extends": "./tsconfig.json",
+  "exclude": ["node_modules", "test", "dist", "**/*spec.ts"]
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "declaration": true,
+    "removeComments": true,
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "allowSyntheticDefaultImports": true,
+    "target": "es2017",
+    "sourceMap": true,
+    "outDir": "./dist",
+    "baseUrl": "./",
+    "incremental": true
+  }
+}