CRUD with jest and winston

.env

+PORT = 3000
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.gitignore

+node_modules/
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combined.log

+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"$__":{"$versionError":null,"activePaths":{"paths":{},"states":{"default":{},"modify":{}}},"backup":{"activePaths":{"default":{"_id":true},"modify":{"age":true,"email":true,"username":true}},"validationError":null},"cachedRequired":{},"inserting":true,"op":null,"saveOptions":null,"savedState":{},"saving":null,"validating":null},"$isNew":false,"_doc":{"__v":0,"_id":"660ba01954379cadc18f7f1d","age":25,"email":"test@example.com","username":"testuser"},"level":"info","message":"User created:"}
+{"$__":{"activePaths":{"paths":{"__v":"init","_id":"init","age":"init","email":"init","username":"init"},"states":{"init":{"__v":true,"_id":true,"age":true,"email":true,"username":true}}},"skipId":true},"$isNew":false,"_doc":{"__v":0,"_id":"660ba01954379cadc18f7f20","age":35,"email":"update@example.com","username":"updateuser"},"level":"info","message":"User updated:"}
+{"0":{"__v":0,"_id":"660b9faaf9c6389d04985dc8","age":25,"email":"test@example.com","username":"testuser"},"1":{"__v":0,"_id":"660b9faff9c6389d04985dca","age":35,"email":"update@example.com","username":"updateuser"},"2":{"__v":0,"_id":"660b9fce60ceb1817425cdf1","age":25,"email":"test@example.com","username":"testuser"},"3":{"__v":0,"_id":"660b9fd360ceb1817425cdf4","age":35,"email":"update@example.com","username":"updateuser"},"4":{"__v":0,"_id":"660ba01954379cadc18f7f1d","age":25,"email":"test@example.com","username":"testuser"},"5":{"__v":0,"_id":"660ba01954379cadc18f7f20","age":35,"email":"update@example.com","username":"updateuser"},"level":"info","message":"Retrieved list of users:"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"$__":{"$versionError":null,"activePaths":{"paths":{},"states":{"default":{},"modify":{}}},"backup":{"activePaths":{"default":{"_id":true},"modify":{"age":true,"email":true,"username":true}},"validationError":null},"cachedRequired":{},"inserting":true,"op":null,"saveOptions":null,"savedState":{},"saving":null,"validating":null},"$isNew":false,"_doc":{"__v":0,"_id":"660ba0402ce1df9f805d4fd6","age":25,"email":"test@example.com","username":"testuser"},"level":"info","message":"User created:"}
+{"$__":{"activePaths":{"paths":{"__v":"init","_id":"init","age":"init","email":"init","username":"init"},"states":{"init":{"__v":true,"_id":true,"age":true,"email":true,"username":true}}},"skipId":true},"$isNew":false,"_doc":{"__v":0,"_id":"660ba0402ce1df9f805d4fd8","age":35,"email":"update@example.com","username":"updateuser"},"level":"info","message":"User updated:"}
+{"0":{"__v":0,"_id":"660ba0402ce1df9f805d4fd6","age":25,"email":"test@example.com","username":"testuser"},"1":{"__v":0,"_id":"660ba0402ce1df9f805d4fd8","age":35,"email":"update@example.com","username":"updateuser"},"level":"info","message":"Retrieved list of users:"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"$__":{"$versionError":null,"activePaths":{"paths":{},"states":{"default":{},"modify":{}}},"backup":{"activePaths":{"default":{"_id":true},"modify":{"age":true,"email":true}},"validationError":null},"cachedRequired":{},"inserting":true,"op":null,"saveOptions":null,"savedState":{},"saving":null,"validating":null},"$isNew":false,"_doc":{"__v":0,"_id":"660ba109fe782ca80b7b3bbb","age":25,"email":"john@gmail.com"},"level":"info","message":"User created:"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"0":{"__v":0,"_id":"660ba0402ce1df9f805d4fd6","age":25,"email":"test@example.com","username":"testuser"},"1":{"__v":0,"_id":"660ba0402ce1df9f805d4fd8","age":35,"email":"update@example.com","username":"updateuser"},"2":{"__v":0,"_id":"660ba109fe782ca80b7b3bbb","age":25,"email":"john@gmail.com"},"level":"info","message":"Retrieved list of users:"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"$__":{"activePaths":{"paths":{"__v":"init","_id":"init","age":"init","email":"init"},"states":{"init":{"__v":true,"_id":true,"age":true,"email":true}}},"skipId":true},"$isNew":false,"_doc":{"__v":0,"_id":"660ba109fe782ca80b7b3bbb","age":24,"email":"john@gmail.com"},"level":"info","message":"User updated:"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}
+{"level":"info","message":"Server listening at http://localhost:3000"}

index.js

+const express = require('express')
+const app = express()
+require('dotenv').config();
+const mongoose = require('mongoose')
+const userRoutes = require('./routes/userRoutes')
+const logger = require('./logger');
+const port = process.env.PORT || 3000
+
+app.use(express.json());
+
+const MONGO_URI = 'mongodb://localhost:27017/test';
+
+/*
+Create a node Express server.
+Connect to mongo DB.
+Create API to create users, update a user and get list of users.
+Add proper logs Write unit tests to test your code.
+*/
+
+mongoose.connect(MONGO_URI)
+    .then(() => {
+      console.log('Connected to MongoDB');
+    })
+    .catch((error) => {
+      console.error('Error connecting to MongoDB:', error);
+    });
+
+
+app.use('/api/users', userRoutes);
+
+
+app.listen(port ,() => {
+    logger.info(`Server listening at http://localhost:${port}`);
+  });
+
+
+  module.exports = app
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logger.js

+const winston = require('winston');
+
+const logger = winston.createLogger({
+  transports: [
+    new winston.transports.Console(),
+    new winston.transports.File({ filename: 'error.log', level: 'error' }),
+    new winston.transports.File({ filename: 'combined.log' })
+  ]
+});
+
+module.exports = logger;

models/user.js

+const mongoose = require('mongoose');
+
+const userSchema = new mongoose.Schema({
+  username: String,
+  email: String,
+  age: Number
+});
+
+module.exports = mongoose.model('User', userSchema);
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package.json

+{
+  "name": "jest",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "jest"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "dotenv": "^16.4.5",
+    "express": "^4.19.2",
+    "jest": "^29.7.0",
+    "mongoose": "^8.2.4",
+    "supertest": "^6.3.4",
+    "winston": "^3.13.0"
+  }
+}

routes/userRoutes.js

+const express = require('express');
+const router = express.Router();
+const User = require('../models/user');
+const logger = require('../logger')
+
+router.post('/', async (req, res) => {
+    try {
+      const user = await User.create(req.body);
+      logger.info('User created:', user);
+      res.status(201).json(user);
+    } catch (err) {
+      logger.error('Error creating user:', err.message);
+      res.status(400).send(err.message);
+    }
+  });
+  
+/*
+curl --location 'http://localhost:3000/api/users/' \
+--header 'Content-Type: application/json' \
+--data-raw '{
+    "userName": "John_doe",
+    "email": "john@gmail.com",
+    "age": 25
+}'
+*/
+  
+  router.put('/:id', async (req, res) => {
+    try {
+      const user = await User.findByIdAndUpdate(req.params.id, req.body, { new: true });
+      if (!user) {
+        logger.error('User not found');
+        return res.status(404).send('User not found');
+      }
+      logger.info('User updated:', user);
+      res.json(user);
+    } catch (err) {
+      logger.error('Error updating user:', err.message);
+      res.status(400).send(err.message);
+    }
+  });
+
+  // set the path param to id of your document created
+  /*
+  curl --location --request PUT 'http://localhost:3000/api/users/660ba109fe782ca80b7b3bbb' \
+--header 'Content-Type: application/json' \
+--data '{
+    "age": 24
+}'
+*/
+  
+  router.get('/', async (req, res) => {
+    try {
+      const users = await User.find();
+      logger.info('Retrieved list of users:', users);
+      res.json(users);
+    } catch (err) {
+      logger.error('Error retrieving users:', err.message);
+      res.status(500).send(err.message);
+    }
+  });
+
+  // curl --location 'http://localhost:3000/api/users/'
+  
+  module.exports = router;
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tests/user.test.js

+const request = require('supertest');
+const app = require('../index');
+const mongoose = require('mongoose');
+const User = require('../models/user');
+
+beforeAll(async () => {
+    await User.deleteMany(); 
+  });
+  
+  afterAll(async () => {
+    await mongoose.disconnect(); 
+  });
+  
+
+describe('User API tests', () => {
+  it('should create a new user', async () => {
+    const res = await request(app)
+      .post('/api/users/')
+      .send({ username: 'testuser', email: 'test@example.com', age: 25 });
+    expect(res.statusCode).toEqual(201);
+    expect(res.body.username).toEqual('testuser');
+    expect(res.body.email).toEqual('test@example.com');
+    expect(res.body.age).toEqual(25);
+  });
+
+  it('should update an existing user', async () => {
+    const newUser = await User.create({ username: 'updateuser', email: 'update@example.com', age: 30 });
+    const res = await request(app)
+      .put(`/api/users/${newUser._id}`)
+      .send({ age: 35 });
+    expect(res.statusCode).toEqual(200);
+    expect(res.body.age).toEqual(35);
+  });
+
+  it('should get a list of users', async () => {
+    const res = await request(app)
+      .get('/api/users/');
+    expect(res.statusCode).toEqual(200);
+    expect(res.body.length).toBeGreaterThan(0);
+  });
+});
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