Download xlsx from S3 and parse it

Question

I need a service to download an excel file from Amazon S3, then parse with node-xlsx

The problem is that I can\'t get xlsx to parse the file. When I try to read back

Answer 1

The node-xlsx module requires that the entire xlsx buffer be available. So you cannot pass it a ReadStream like you're currently doing. Try this method which entirely avoids writing to disk:

router.get('/process', (req, res) => {
    var fileName = 'https://some-bucket.s3.amazonaws.com/some-excel-file.xlsx'
    https.get(fileName, response => {
        var chunks = []
        response.on('data', chunk => chunks.push(chunk))
        .on('end', () => {
            var book = xlsx.parse(Buffer.concat(chunks))
            book.forEach(sheet => console.log('sheet', sheet.name))
            res.status(200)          
        })
        .on('error', e => {
            res.status(500)
        })
    })
    return
})