Connect to mongodb using mongoose in node js express tutorial, you will learn how to connect mongoose with node js express application.
MongoDB is a document database built on a scale-out architecture that has become popular with developers of all kinds who are building scalable applications using agile methodologies. MongoDB was built for people who are building internet and business applications who need to evolve quickly and scale elegantly.
How to Connect Mongoose with Node js Express Application
- Step 1 – Create Node JS App
- Step 2 – Install Express-Validator and Body Parser Module
- Step 3 – Create Server.js File
- Step 4 – Connect App to MongoDB
- Step 5 – Start App Server
Step 1 – Create Node JS App
Create Node js express app; So, execute the following command on terminal:
mkdir my-app cd my-app npm init -yes
Step 2 – Install Mongoose and Body Parser Module
Install mongoose s and body-parser modules into your node js express application by executing the following command on command prompt:
npm install mongoose express body-parser
- body-parser – Node.js request body parsing middleware which parses the incoming request body before your handlers, and make it available under req.body property. In other words, it simplifies the incoming request.
Step 3 – Create Server.js File
Create Server.js and import above installed modules in it. So visit your app root directory and create Server.js and validate fields; as following:
const express = require("express")
const mongoose = require("mongoose")
const bodyParser = require("body-parser")
const app = express()
const PORT = 3000
app.listen(PORT, () => {
console.log(`app is listening to PORT ${PORT}`)
})
Step 4 – Connect App to MongoDB
Connect mongoose to local MongoDB instance with db name as testdb; so add the following code into server.js file:
mongoose.connect("mongodb://localhost:27017/testdb", {
useNewUrlParser: "true",
})
mongoose.connection.on("error", err => {
console.log("err", err)
})
mongoose.connection.on("connected", (err, res) => {
console.log("mongoose is connected")
})
Step 5 – Start App Server
Open your command prompt and execute the following command to run node js express file upload application:
//run the below command node sever.js
Conclusion
Connect to mongodb using mongoose in node js express tutorial, you have learn how to connect mongodb using mongoose with node js express application.
