How to Rest Api Import CSV File Data to MySQL Database in Node js?

Hi Dev,

In this tutorial, you will learn how to upload or import CSV file data to a MySQL database using Node.js + Express, REST APIs, Multer, and Fast CSV.

This tutorial will guide you in creating a simple REST API in Node.js, which will be used to obtain CSV file data on the Node.js route. In the router method, we will read this CSV file, and then the data will be imported/inserted/uploaded to the MySQL database.

Step 1 : Create Node Express js App

Execute the following command on terminal to create node js app:

mkdir my-app
cd my-app
npm init -y

Step 2 : Create Table in MySQL Database

Execute the following sql query to create a table into your database:

CREATE TABLE `customer` 
(
    `id` bigint(20) NOT NULL,
    `address` varchar(255) DEFAULT NULL,
    `age` int(11) DEFAULT NULL,
    `name` varchar(255) DEFAULT NULL,
    PRIMARY KEY (`id`)
) 
    ENGINE=MyISAM DEFAULT CHARSET=utf8

Step 3 : Install express multer body-parser mysql dependencies

Execute the following command on the terminal to express multer ejs body-parser mysql dependencies :

npm install express multer body-parser mysql fast-csv

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.

fast-CSV

Fast-csv is library for parsing and formatting CSVs or any other delimited value file in node.

Multer

Multer is a node.js middleware for handling multipart/form-data , which is primarily used for uploading files. It is written on top of busboy for maximum efficiency.

Mysql

A node.js driver for mysql. It is written in JavaScript, does not require compiling, and is 100% MIT licensed.

Step 4 : Create Server.js File and Route

Create server.js file; Then import express multer body-parser mysql fast csv dependencies in server.js and as well as create API route for import csv file data in MySql database; as shown below:

const express = require('express')
const app = express()
const bodyparser = require('body-parser')
const fs = require('fs');
const csv = require('fast-csv');
const mysql = require('mysql')
const multer = require('multer')
const path = require('path')

//use express static folder

app.use(express.static("./public"))

// body-parser middleware use

app.use(bodyparser.json())
app.use(bodyparser.urlencoded({
   extended: true
}))

// Database connection

const db = mysql.createConnection({
   host: "localhost",
   user: "root",
   password: "",
   database: "test"
})

db.connect(function (err) {
    if (err) {
       return console.error('error: ' + err.message);
    }
    console.log('Connected to the MySQL server.');
})

//! Use of Multer

var storage = multer.diskStorage({
    destination: (req, file, callBack) => {
        callBack(null, './uploads/')    
    },
    filename: (req, file, callBack) => {
        callBack(null, file.fieldname + '-' + Date.now() + path.extname(file.originalname))
    }
})

var upload = multer({
    storage: storage
});

//! Routes start

//route for Home page

app.get('/', (req, res) => {
    res.sendFile(__dirname + '/index.html');
});

//@type   POST

//route for post data

// -> Express Upload RestAPIs

app.post('/api/uploadfile', upload.single("uploadfile"), (req, res) =>{
        UploadCsvDataToMySQL(__dirname + '/uploads/' + req.file.filename);
        res.json({
        'msg': 'File uploaded/import successfully!', 'file': req.file
    });
});

function UploadCsvDataToMySQL(filePath){
    let stream = fs.createReadStream(filePath);
    let csvData = [];
    let csvStream = csv
    .parse()
    .on("data", function (data) {
       csvData.push(data);
    })
    .on("end", function () {

        // Remove Header ROW

        csvData.shift();

        // Open the MySQL connection

        db.connect((error) => {
            if (error) {
               console.error(error);
            } else {
                let query = 'INSERT INTO customer (id, address, name, age) VALUES ?';
                db.query(query, [csvData], (error, response) => {
                   console.log(error || response);
                });
            }
        });

        // delete file after saving to MySQL database

        // -> you can comment the statement to see the uploaded CSV file.

        fs.unlinkSync(filePath)
    });

    stream.pipe(csvStream);

}

//create connection

const PORT = process.env.PORT || 3000
app.listen(PORT, () => console.log(`Server is running at port ${PORT}`))

Step 5 : Start App Server

You can use the following command to start node js upload csv file to mysql database app server:

//run the below command

npm start

Step 6 : Call Rest API with CSV File

Open your postman app and call country state city list apis; as shown below:

URL :- http://localhost:3000/api/uploadfile
Method :- POST