Run Excel Spreadsheets Live On Open Source Node.js Servers

Convert your Excel spreadsheet into a Node.js application that performs all the calculations on the server, and displays the spreadsheet on the web.

September 11, 2015 — SpreadsheetConverter is an add-on to Microsoft Excel that lets you convert spreadsheets to live web pages. The new version 8 recently became available at

When you convert Excel spreadsheets for the web, the formulas in the spreadsheet are converted to JavaScript program code. This program code is clear-text and any reasonably skilled programmer can read the program code and extract crucial information like markup or discount levels, salary information or date/time-related parameters.

“When a calculator is for internal use only, this is usually not a problem, but when you expose your business algorithms to the general public it means someone can learn a lot about your business with very little effort”, says Anna Winter, sales manager for SpreadsheetConverter.

If you need to protect the Excel formulas, you can now use the industry-standard, open source Node.js environment to hide the formulas on a web server. To provide a secure operating environment for business-critical calculations, the Node.js flavor of SpreadsheetConverter creates the program code separately from the web page.

When a website visitor wants to use the calculator, the web browser downloads the web page from the web server without any sensitive program code. Instead, special code snippets in the web page act as conduits between the web page and the JavaScript program code on the Node.js server. This effectively hides the spreadsheet’s formulas and their program counterparts from any prying eyes.

“It’s amazing how fast Node.js is. For every cell you edit, the Node.js server must be invoked in real-time to apply the relevant formulas and update other cells in the spreadsheet. If you didn’t know you were working against a server, you would think it was all done locally in the web browser – there is no noticeable delay”, says Winter.

You can run Node.js on one of your own servers or select from a wide range of third-party hosting providers. Node.js is supported on all major server operating systems, e.g. Windows, Linux and Mac OS X.

SpreadsheetConverter is available for free trial at It creates web pages that are completely standalone, do not use Excel and run on all web servers. You only need Excel and the Spreadsheet Converter add-on for the actual conversion from spreadsheet to web page format. There is a one-time fee for the conversion program, with no extra fees per page, user or server. You may use the program and the web pages it creates for as long as you like. Full versions start at $127.


Media contact: Anna Winter,


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