docs.sheetjs.com/docz/static/aws/index.js

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/* sheetjs (C) 2013-present SheetJS -- https://sheetjs.com */
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'use strict';
var XLSX = require('xlsx');
var Busboy = require('busboy');
exports.handler = function(event, context, callback) {
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if(event.requestContext.http.method == "GET") {
/* make workbook */
var wb = XLSX.read("S,h,e,e,t,J,S\n5,4,3,3,7,9,5", {type: "binary"});
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/* write to XLSX file in Base64 encoding */
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var body = XLSX.write(wb, {type:"base64", bookType: "xlsx"});
/* mark as attached file */
var headers = { "Content-Disposition": 'attachment; filename="SheetJSLambda.xlsx"'};
/* Send back data */
callback(null, {
statusCode: 200,
isBase64Encoded: true,
body: body,
headers: headers
});
return;
}
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/* set up busboy */
var ctype = event.headers['Content-Type']||event.headers['content-type'];
var bb = Busboy({headers:{'content-type':ctype}});
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/* busboy is evented; accumulate the fields and files manually */
var fields = {}, files = {};
bb.on('error', function(err) { callback(null, { body: err.message }); });
bb.on('field', function(fieldname, val) {fields[fieldname] = val });
bb.on('file', function(fieldname, file, filename) {
/* concatenate the individual data buffers */
var buffers = [];
file.on('data', function(data) { buffers.push(data); });
file.on('end', function() { files[fieldname] = [Buffer.concat(buffers), filename]; });
});
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/* on the finish event, all of the fields and files are ready */
bb.on('finish', function() {
/* grab the first file */
var f = files["upload"];
if(!f) callback(new Error("Must submit a file for processing!"));
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/* f[0] is a buffer */
var wb = XLSX.read(f[0]);
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/* grab first worksheet and convert to CSV */
var ws = wb.Sheets[wb.SheetNames[0]];
callback(null, { statusCode: 200, body: XLSX.utils.sheet_to_csv(ws) });
});
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bb.end(Buffer.from(event.body, "base64"));
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};