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Node.js (the latest LTS version). Visit the Node.js site to download and install the right version for your operating system.
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The latest version of Yeoman and the Yeoman generator for Office Add-ins. To install these tools globally, run the following command via the command prompt.
npm install -g yo generator-office[!includenote to update Yeoman generator]
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Office connected to a Microsoft 365 subscription (including Office on the web).
[!NOTE] If you don't already have Office, you might qualify for a Microsoft 365 E5 developer subscription through the Microsoft 365 Developer Program; for details, see the FAQ. Alternatively, you can sign up for a 1-month free trial or purchase a Microsoft 365 plan.