ExpressJS CSV download

node.js

const express = require('express');
const app = express();

// Sample data in CSV format
const csvData = [
  ['Name', 'Email'],
  ['John Doe', 'johndoe@example.com'],
  ['Jane Smith', 'janesmith@example.com'],
];

// Define a route to trigger the CSV download
app.get('/download-csv', (req, res) => {
  // Define the file name and content type
  const fileName = 'sample.csv';
  res.setHeader('Content-Disposition', `attachment; filename=${fileName}`);
  res.setHeader('Content-Type', 'text/csv');

  // Create a writable stream to the response
  const stream = res;

  // Write the CSV data to the response
  csvData.forEach((row) => {
    stream.write(row.join(',') + '\n');
  });

  // End the response
  stream.end();
});

// Start the Express server
const port = 3000;
app.listen(port, () => {
  console.log(`Server is running on port ${port}`);
});