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

This is how you can read a file from S3 nodejs and keep it in memory without first writing the file to some location on disk. It can be used with a combination of S3 and AWS Lambda so that you don't have to write the files to some location on the Lambda.

Remember this processes is asynchronous.

   var params = {
        Bucket: "",
        Key: ""
    };

    var file = s3.getObject(params).createReadStream();
    var buffers = [];

    file.on('data', function (data) {
        buffers.push(data);
    });

    file.on('end', function () {
        var buffer = Buffer.concat(buffers);
        var workbook = xlsx.parse(buffer);
        console.log("workbook", workbook)
    });