sheetjs/demos/function/Firebase/functions/index.js

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const functions = require('firebase-functions');
const Busboy = require('busboy');
const XLSX = require('xlsx');
// // Create and Deploy Your First Cloud Functions
// // https://firebase.google.com/docs/functions/write-firebase-functions
//
exports.helloWorld = functions.https.onRequest((request, response) => {
response.send("Hello from Firebase!");
});
exports.main = functions.https.onRequest((req, res) => {
var bb = new Busboy({
headers: {
'content-type': req.headers['content-type']
}
});
let fields = {};
let files = {};
bb.on('field', (fieldname, val) => {
fields[fieldname] = val;
});
bb.on('file', (fieldname, file, filename) => {
var buffers = [];
file.on('data', (data) => {
buffers.push(data);
});
file.on('end', () => {
files[fieldname] = [Buffer.concat(buffers), filename];
});
});
bb.on('finish', () => {
let f = files[Object.keys(files)[0]];
const wb = XLSX.read(f[0], { type: "buffer" });
// Convert to CSV
res.send(XLSX.utils.sheet_to_csv(wb.Sheets[wb.SheetNames[0]]));
});
bb.end(req.body)
});