Dynamically create and stream zip to client

Archiver has an append method that lets you save text as a file. To “stream” that data to the user you can simply pipe to the HTTP response object.

var Http = require('http');
var Archiver = require('archiver');

Http.createServer(function (request, response) {
    // Tell the browser that this is a zip file.
    response.writeHead(200, {
        'Content-Type': 'application/zip',
        'Content-disposition': 'attachment; filename=myFile.zip'
    });

    var zip = Archiver('zip');

    // Send the file to the page output.
    zip.pipe(response);

    // Create zip with some files. Two dynamic, one static. Put #2 in a sub folder.
    zip.append('Some text to go in file 1.', { name: '1.txt' })
        .append('Some text to go in file 2. I go in a folder!', { name: 'somefolder/2.txt' })
        .file('staticFiles/3.txt', { name: '3.txt' })
        .finalize();

}).listen(process.env.PORT);

This will create a zip file with the two text files. The user visiting this page will be presented with a file download prompt.