Nội Dung Chính

Simple rest api builing with mysql and express js and testing with mocha and chai

Boilerplate for building the rest api with sequelize and mysql using express js. the repository will contains crud operation with mysql database using sequelize ORM.

For front end development purpose we need to example api server to design site or for practice of angular and react js or vue.js or other front end framework. we need to primary backend server. the repository is created for who are learning the server side development with node js and using as example api server for front and development. we can also use this for our production development purpose also.

Prerequisite

Express JS
mysql2
sequelize-cli
sequelize
nodemon
doenv

Installation

clone the repository git clone https://github.com/tariqulislam/express-mysql-rest.git
install the sequelize cli for support ORM command For npm package: npm install -g sequelize-cli For yarnpackage: yarn add global sequelize-cli
run command for npm npm install and for yarn yarn install
create database to mysql, if you use command line, command will be >mysql -u <username> -p <password> mysql> create DATABASE test_dev mysql> exit
then use command for migrate the database 1. for Yarn command : yarn db:migrate 2. for npm command : npm run db:migrate
For development purpose user command yarn start:dev

Predefiend api endpoint

For consuming the get api or list for user [GET]http://localhost:3000/api/users
For posting the data to api [POST]http://localhost:3000/api/users Request Body: { firstName: ‘example name’, lastName: ‘example last name, email: ‘example email’ }

Create the New Model for Application

$ sequelize model:create --name User --attributes firstName:string, lastName:string, email:string

this command will create the model file with migration file at db folder.those are file name are based on model name 1. db/model/.js file 2. db/migration/ -create-user.js

Example of model file is

'use strict';
module.exports = (sequelize, DataTypes) => {
  var User = sequelize.define('User', {
    firstName: DataTypes.STRING,
    lastName: DataTypes.STRING,
    email: DataTypes.STRING
  }, {});
  User.associate = function(models) {
    // associations can be defined here
    User.hasMany(models.Comment,{
      foreignKey: 'userId',
      as: 'comments'
    });
  };
  return User;
};

Example of migration file is

'use strict';
module.exports = {
  up: (queryInterface, Sequelize) => {
    return queryInterface.createTable('Users', {
      id: {
        allowNull: false,
        autoIncrement: true,
        primaryKey: true,
        type: Sequelize.INTEGER
      },
      firstName: {
        type: Sequelize.STRING
      },
      lastName: {
        type: Sequelize.STRING
      },
      email: {
        type: Sequelize.STRING
      },
      createdAt: {
        allowNull: false,
        type: Sequelize.DATE
      },
      updatedAt: {
        allowNull: false,
        type: Sequelize.DATE
      }
    });
  },
  down: (queryInterface, Sequelize) => {
    return queryInterface.dropTable('Users');
  }
};

at migration two field are automatically added. those are createdAt and updatedAt field. then we need to migrate model to database just run the command yarn db:migrate or npm run db:migrate to create table at database and ORM mapping purpose.

Create the controller for Rest api

For controller we have to create the controller folder to root of the application. for example purpose users.js file is created. that controller control all the business logic of the application. We will export the different function from controller file.

For GET Api example code will be

list(req, res) {
        return user
        .all()
        .then(users => res.status(200).json(ResponseFormat.build(
            users,
            "User Information Reterive successfully",
            200,
            "success"
        )))
        .catch(error => res.status(400).send(ResponseFormat.build(
            error,
            "Somthing went wrong when Reterieve Information",
            400,
            "error"
        )));
    }

For POST Api example code will be

create(req, res) {
        return user
        .create({
            firstName: req.body.firstName,
            lastName: req.body.lastName,
            email: req.body.email
        })
        .then(user => res.status(201).json(ResponseFormat.build(
            user,
            "User Create Successfully",
            201,
            "success"
        )))
        .catch(error => res.status(400).json(ResponseFormat.error(
            error,
            "Something went wrong when create Users",
            "error"
        )))
    },

Routing the Api

For Api routing purpose i have added the index.js file to “`routes“ folder, and to routing the api we should use this code

const userController = require('../controllers').users
const commentController = require('../controllers').comments
module.exports = (app) => {
  app.post('/api/users', userController.create);
  app.get('/api/users', userController.list);
}

If you want to add the other controller to routes. just add the controller by Import the controller module:

const [ControllerName] = require(/* Import the file */).[Export Module Name]

then call the funtions inside the module.exports:

app.<REST API COSUME METHOD>(<API END POINT>, <CONTROLLER NAME>.<METHOD>)

It’s so easy and minimal code and configuration to create the rest api with mysql and express. you can use this to your project for starter.

###sample test script with Mocha and Chai

Create the folder test at root directory
Create the file named user.js at test folder

For testing with Mocha and Chai we have just add the Mocha globally

> npm install -g mocha

At the user.js file i have provide you the sample testing script for api testing.

For testing purpose we have change Node js environment variable at user.js file

process.env.NODE_ENV = "test"

Then we have to add the model which will be use for testing

const User = require('../db/models').User;

Then add the chai and chai-http package for testing the api server. for testing with api server we need to add main js file app.js as server

const chai = require('chai');
const chaiHttp = require('chai-http');
const app = require('../app');
const should = chai.should();
chai.use(chaiHttp)

[GET] /users testing:

describe('/GET user', () => {
    it('it should Get all users', (done) => {
        chai.request(app)
        .get('/api/users')
        .end((err, res) => {
            res.should.have.status(200);
            res.body.should.be.a('object');
            done();
        });
    });
});

[POST] /users testing:

describe('/POST user', () => {
    it('it sould post the user info', (done) => {
        const user = {
            firstName: " Husne Ara",
            lastName: "Asma",
            email: "[email protected]"
        };
        chai.request(app)
        .post('/api/users')
        .send(user)
        .end((err, res) => {
            res.should.have.status(201);
            res.body.should.be.a('object');
            res.body.should.have.property('data');
            res.body.should.have.property('message');
            res.body.should.have.property('statusType').eq('success');
            done();
        });
    });
});

[PUT] /user Testing:

describe('/PUT/:id user', () => {
    it("should not update the user info", (done) => {
        const user = {
            firstName: "Mr.",
            lastName: "Himu",
        }
        const userId = 2;
         chai.request(app)
         .put('/api/users/'+ userId)
         .send(user)
         .end((err, res) => {
             res.should.have.status(404);
             res.body.should.be.a('object');
             res.body.should.have.property('message');
             res.body.should.have.property('statusType').eq('error');
             done();
         });
    });
});

Full soruce code are available at https://github.com/tariqulislam/express-mysql-rest.git