In this blog, we will be learning how to create simple crud APIs in Express JS ( Node JS Framework ).
The Mean stack is used to describe development using MongoDB, Express.js, Angular.jS, and Node.js. Now, I will show you how to use Express.js, Node.js, and MongoDB.js. We will be creating a simple Node application that will allow users to input data they want to store in a MongoDB database, also showing all other data entered.
Install using Node, Express, MongoDB
Express
Express.js is a web application framework. It simplifies the server creation process that is already available in Node. Node allows you to use JavaScript as your server-side language.
We need to install express via npm
npm install express --save
MongoDB
MongoDB is an open-source database. Mongoose is a client API for node.js, making it easy to access our database from our Express application.
We need to install MongoDB via npm.
npm install mongodb --save
Create a project in Express
For creating a project, we run the below command in the command prompt where you want to create.
npm init
Project Structure
MongoCrud- Package name
controller
– product.controller.js
Models
– product.model.js
– routes
– product.route.js
– node_modules
– app.js
– package.json
Create a Database Connectivity File
Here we can create a file in mongoose schemas and MongoDB connection. You should connect to MongoDB through the Mongo client’s connect method.
const MongoClient = require('mongodb').MongoClient
MongoClient.connect('mongodb-connection-string', (err, client) => {
})
app.js
const express = require('express');
const bodyParser = require('body-parser');
const mongoose = require('mongoose');
mongoose.connect("mongodb://localhost:27017/testdb", {
keepAlive: true,
keepAliveInitialDelay: 300000,
socketTimeoutMS: 2000000,
useNewUrlParser: true,
useUnifiedTopology: true,
useCreateIndex: true,
}).then(data=>console.log('db connected')).catch(err=>console.log('db error', err));
const product = require('./routes/product.route');
const app = express();
app.use(express.json());
app.use('/products', product);
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
let port = 3000;
app.listen(port, () => {
console.log('Running on port numner ' + port);
});
Create a Model Schema
Everything in Mongoose starts with a Schema. Each schema maps to a MongoDB collection and defines the type of the documents within that collection.
product.model.js
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
require('mongoose-type-email');
let studentSchema = new Schema({
id: { type: Number, required: true, max: 100 },
firstName: { type: String, required: true, max: 100 },
lastName: { type: String, required: true, max: 100 },
email: { type: mongoose.SchemaTypes.Email, required: true },
amount: [{ type: Number, required: true, max: 100 }]
});
// Export the model
module.exports = mongoose.model("students", studentSchema, "students");
Create a Controller
We created CRUD for communicating with the server. Now we will apply the real logic to the route and controller.
Create a new student (POST request)
const Student = require('../models/product.model');
//Simple Testing
exports.test = function (req, res) {
res.send('Hi guys!');
};
exports.student_create = function (req, res, next) {
var product = [{
id: req.body.id,
firstName: req.body.firstName,
lastName: req.body.lastName,
email: req.body.email,
}]
Student.create(product, ((err, result) => {
console.log('result', result);
if (!err) {
res.send({
msg: "Data inserted successfully"
data: result
})
return;
}
In the route, we don’t have to pass anything, Here we can upload the route file.
Product.route.js
const express = require('express');
const router = express.Router();
// call for controller
const product_controller = require('../controller/product.controller');
// test url
router.get('/test', product_controller.test);
router.post('/create', product_controller.student_create);
module.exports = router;
res.send({
msg: "error",
})
}));
}
Get all student (GET request)
exports.get_Student = function (req, res, next) {
Student.find({})
.then((response) => {
console.log("response", response);
res.json({
data: response,
msg: 'Getting all the student data'
});
})
.catch((err) => {
res.send('error has occured', err);
})
};
we will import Controller and apply getstudent method.
router.get('/allStudents', product_controller.get_Student);
Update a single student (PUT method)
Remember that, without {new: true}, the updated document will not be returned.
exports.update_Student = function (req, res) {
Student.findOneAndUpdate(req.params._id, {
id: req.body.id,
firstName: req.body.firstName,
lastName: req.body.lastName,
email: req.body.email,
}, { new: true, useFindAndModify: false }, function (err, result) {
if (err) {
console.log('err', err);
res.send('error updating student');
} else {
console.log(result);
res.status(200).send({
data: result,
msg: 'data updated successfully'
});
}
});
};
In the routes,
router.put('/Student/:id', product_controller.update_Student);
Delete a single contact (DELETE method)
exports.delete_Student = function(req, res, next) {
Student.findByIdAndRemove({_id: req.params.id}, function(err, hero) {
if(err) {
res.json({
error : err
})
}
res.json({
message : "Student deleted successfully"
})
})
}
In the routes,
router.delete('/delete/:id', product_controller.delete_Student);
API Calls
Below are the all screenshots of all APIs call, which having REST APIs and results of these APIs.
Create API
Get API
Update API
Delete API
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