Node.js Express Project to Download CSV File With Headers Using csv-express Middleware in Browser Using Javascript

Welcome folks today in this blog post we will be generating and downloading csv file with headers using csv-express middleware in browser using javascript. All the full source code of the application is shown below.

Get Started

In order to get started you need to make a new node.js project using the below command

npm init -y

npm i express

npm i csv-express

And after that you will see the below directory structure of the node.js and express as shown below

Now we need to make the index.js file and copy paste the below code

index.js

var express = require('express')
var csv = require('csv-express')
var app = express()
 
// Basic
app.get('/', function(req, res) {
  res.csv([
    ["a", "b", "c"]
  , ["d", "e", "f"]
  ])
})
 
// Add headers
app.get('/headers', function(req, res) {
  res.csv([
    {"a": 1, "b": 2, "c": 3},
    {"a": 4, "b": 5, "c": 6}
  ], true)
})
 
app.listen(3000)

var express = require('express')

var csv = require('csv-express')

var app = express()

// Basic

app.get('/', function(req, res) {

res.csv([

["a", "b", "c"]

, ["d", "e", "f"]

])

})

// Add headers

app.get('/headers', function(req, res) {

res.csv([

{"a": 1, "b": 2, "c": 3},

{"a": 4, "b": 5, "c": 6}

], true)

})

app.listen(3000)

As you can see we are importing the csv-express middleware and then we are passing the csv middleware when we go to the / route and then as soon as we go to that route the csv file is downloaded as an attachment and then if we need the csv file with headers then we need to go to /headers route and then the csv file will be downloaded as an attachment.