RESTful API Node Server Boilerplate

A boilerplate/starter project for quickly building RESTful APIs using Node.js, Express, and Mongoose.

By running a single command, you will get a production-ready Node.js app installed and fully configured on your machine. The app comes with many built-in features, such as authentication using JWT, request validation, unit and integration tests, continuous integration, docker support, API documentation, pagination, etc. For more details, check the features list below.

Quick Start

To create a project, simply run:

npx create-nodejs-express-app <project-name>

Or

npm init nodejs-express-app <project-name>

Manual Installation

If you would still prefer to do the installation manually, follow these steps:

Clone the repo:

git clone --depth 1 https://github.com/hagopj13/node-express-boilerplate.git
cd node-express-boilerplate
npx rimraf ./.git

Install the dependencies:

yarn install

Set the environment variables:

cp .env.example .env

# open .env and modify the environment variables (if needed)

Table of Contents

• Features
• Commands
• Environment Variables
• Project Structure
• API Documentation
• Error Handling
• Validation
• Authentication
• Authorization
• Logging
• Custom Mongoose Plugins
• Linting
• Contributing

Features

• NoSQL database: MongoDB object data modeling using Mongoose
• Authentication and authorization: using passport
• Validation: request data validation using Joi
• Logging: using winston and morgan
• Testing: unit and integration tests using Jest
• Error handling: centralized error handling mechanism
• API documentation: with swagger-jsdoc and swagger-ui-express
• Process management: advanced production process management using PM2
• Dependency management: with Yarn
• Environment variables: using dotenv and cross-env
• Security: set security HTTP headers using helmet
• Santizing: sanitize request data against xss and query injection
• CORS: Cross-Origin Resource-Sharing enabled using cors
• Compression: gzip compression with compression
• CI: continuous integration with Travis CI
• Docker support
• Code coverage: using coveralls
• Code quality: with Codacy
• Git hooks: with husky and lint-staged
• Linting: with ESLint and Prettier
• Editor config: consistent editor configuration using EditorConfig

Commands

Running locally:

yarn dev

Running in production:

yarn start

Testing:

# run all tests
yarn test

# run all tests in watch mode
yarn test:watch

# run test coverage
yarn coverage

Docker:

# run docker container in development mode
yarn docker:dev

# run docker container in production mode
yarn docker:prod

# run all tests in a docker container
yarn docker:test

Linting:

# run ESLint
yarn lint

# fix ESLint errors
yarn lint:fix

# run prettier
yarn prettier

# fix prettier errors
yarn prettier:fix

Environment Variables

The environment variables can be found and modified in the .env file. They come with these default values:

# Port number
PORT=3000

# URL of the Mongo DB
MONGODB_URL=mongodb://127.0.0.1:27017/node-boilerplate

# JWT
# JWT secret key
JWT_SECRET=thisisasamplesecret
# Number of minutes after which an access token expires
JWT_ACCESS_EXPIRATION_MINUTES=30
# Number of days after which a refresh token expires
JWT_REFRESH_EXPIRATION_DAYS=30

# SMTP configuration options for the email service
# For testing, you can use a fake SMTP service like Ethereal: https://ethereal.email/create
SMTP_HOST=email-server
SMTP_PORT=587
SMTP_USERNAME=email-server-username
SMTP_PASSWORD=email-server-password
EMAIL_FROM=support@yourapp.com

Project Structure

src\
 |--config\         # Environment variables and configuration related things
 |--controllers\    # Route controllers (controller layer)
 |--docs\           # Swagger files
 |--middlewares\    # Custom express middlewares
 |--models\         # Mongoose models (data layer)
 |--routes\         # Routes
 |--services\       # Business logic (service layer)
 |--utils\          # Utility classes and functions
 |--validations\    # Request data validation schemas
 |--app.js          # Express app
 |--index.js        # App entry point

API Documentation

To view the list of available APIs and their specifications, run the server and go to http://localhost:3000/v1/docs in your browser. This documentation page is automatically generated using the swagger definitions written as comments in the route files.

API Endpoints

List of available routes:

Auth routes:
POST /v1/auth/register - register
POST /v1/auth/login - login
POST /v1/auth/refresh-tokens - refresh auth tokens
POST /v1/auth/forgot-password - send reset password email
POST /v1/auth/reset-password - reset password
POST /v1/auth/send-verification-email - send verification email
POST /v1/auth/verify-email - verify email

User routes:
POST /v1/users - create a user
GET /v1/users - get all users
GET /v1/users/:userId - get user
PATCH /v1/users/:userId - update user
DELETE /v1/users/:userId - delete user

Error Handling

The app has a centralized error handling mechanism.

Controllers should try to catch the errors and forward them to the error handling middleware (by calling next(error)). For convenience, you can also wrap the controller inside the catchAsync utility wrapper, which forwards the error.

const catchAsync = require('../utils/catchAsync');

const controller = catchAsync(async (req, res) => {
  // this error will be forwarded to the error handling middleware
  throw new Error('Something wrong happened');
});

The error handling middleware sends an error response, which has the following format:

{
  "code": 404,
  "message": "Not found"
}

When running in development mode, the error response also contains the error stack.

The app has a utility ApiError class to which you can attach a response code and a message, and then throw it from anywhere (catchAsync will catch it).

For example, if you are trying to get a user from the DB who is not found, and you want to send a 404 error, the code should look something like:

const httpStatus = require('http-status');
const ApiError = require('../utils/ApiError');
const User = require('../models/User');

const getUser = async (userId) => {
  const user = await User.findById(userId);
  if (!user) {
    throw new ApiError(httpStatus.NOT_FOUND, 'User not found');
  }
};

Validation

Request data is validated using Joi. Check the documentation for more details on how to write Joi validation schemas.

The validation schemas are defined in the src/validations directory and are used in the routes by providing them as parameters to the validate middleware.

const express = require('express');
const validate = require('../../middlewares/validate');
const userValidation = require('../../validations/user.validation');
const userController = require('../../controllers/user.controller');

const router = express.Router();

router.post('/users', validate(userValidation.createUser), userController.createUser);

Authentication

To require authentication for certain routes, you can use the auth middleware.

const express = require('express');
const auth = require('../../middlewares/auth');
const userController = require('../../controllers/user.controller');

const router = express.Router();

router.post('/users', auth(), userController.createUser);

These routes require a valid JWT access token in the Authorization request header using the Bearer schema. If the request does not contain a valid access token, an Unauthorized (401) error is thrown.

Generating Access Tokens:

An access token can be generated by making a successful call to the register (POST /v1/auth/register) or login (POST /v1/auth/login) endpoints. The response of these endpoints also contains refresh tokens (explained below).

An access token is valid for 30 minutes. You can modify this expiration time by changing the JWT_ACCESS_EXPIRATION_MINUTES environment variable in the .env file.

Refreshing Access Tokens:

After the access token expires, a new access token can be generated, by making a call to the re