Custom functions enable you to add new functions to Excel by defining those functions in JavaScript as part of an add-in. Users within Excel can access custom functions just as they would any native function in Excel, such as SUM().

This repository contains the source code used by the Yo Office generator when you create a new custom functions project. You can also use this repository as a sample to base your own custom functions project from if you choose not to use the generator. For more detailed information about custom functions in Excel, see the Custom functions overview article in the Office Add-ins documentation or see the additional resources section of this repository.

This template supports debugging custom functions from Visual Studio Code. For more information see Custom functions debugging. For general information on debugging task panes and other Office Add-in parts, see Test and debug Office Add-ins.

We'd love to get your feedback about this sample. You can send your feedback to us in the Issues section of this repository.

Questions about Microsoft Office 365 development in general should be posted to Stack Overflow. If your question is about the Office JavaScript APIs, make sure it's tagged with  [office-js].

• Custom functions overview
• Custom functions best practices
• Custom functions runtime
• Office add-in documentation
• More Office Add-in samples at OfficeDev on Github

This project has adopted the Microsoft Open Source Code of Conduct. For more information, see the Code of Conduct FAQ or contact [email protected] with any additional questions or comments.

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