If the local web server is already running and your add-in is already loaded in Excel, proceed to step 2. Otherwise, start the local web server and sideload your add-in:
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To test your add-in in Excel, run the following command in the root directory of your project. This starts the local web server (if it's not already running) and opens Excel with your add-in loaded.
npm start
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To test your add-in in Excel on the web, run the following command in the root directory of your project. When you run this command, the local web server starts. Replace "{url}" with the URL of an Excel document on your OneDrive or a SharePoint library to which you have permissions.
[!INCLUDE npm start on web command syntax]