Prompt a csv file to download as pop up using node.js and node-csv-parser (node module)

Question

Recently I have started working with node.js. While going through a requirement in one of my projects I am facing an issue where I should be able to write some data to a csv

Answer 1

Express-csv is a great module for writing csv contents to stream from a node.js server, which will be sent as a response to the client (and downloaded as a file). Very easy to use.

app.get('/', function(req, res) {
  res.csv([
    ["a", "b", "c"]
  , ["d", "e", "f"]
  ]);
});

The docs: https://www.npmjs.com/package/express-csv

When you pass an object, you need to prepend the headers explicitly (if you want them). Here's my my example using npm mysql

router.route('/api/report')
    .get(function(req, res) {
            query = connection.query('select * from table where table_id=1;', function(err, rows, fields) {
                if (err) {
                    res.send(err);
                }
                var headers = {};
                for (key in rows[0]) {
                    headers[key] = key;
                }
                rows.unshift(headers);
                res.csv(rows);
            });
    });