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Build powerful applications for Office

Use the Office JavaScript API to extend functionality for Word, Excel, PowerPoint, and Outlook.

Build applications for Excel

Integrate with Outlook

Create add-ins for PowerPoint

Extend Word across multiple platforms

What's new in Office development

Get OneDrive data using Microsoft Graph and MSAL.NET in an Office Add-...

Learn how to build a Microsoft Office Add-in that connects to Microsoft Graph, finds the first three workbooks stored in OneDrive for Busine...
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New ways for Cloud Storage Partners to integrate their services with M...

We have added new ways for our Cloud Storage Partners to integrate their services to ensure customers can collaborate on documents no matter...
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Single Sign-on (SSO) sample Outlook add-in

An Outlook add-in sample that accesses Microsoft Graph using single sign-on and adds buttons to the Outlook ribbon.
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Get OneDrive data using Microsoft Graph and msal.js in an Office Add-i...

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Office Add-in that supports Single Sign-on to Office, the add-in, and ...

This sample implements an Office Add-in that uses the `getAccessToken` API in Office.js to give the add-in access to Microsoft Graph data. T...
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Manage ribbon and task pane UI, and run code on doc open

This sample shows how to create contextual ribbon buttons that are enabled based on the state of your add-in. It also shows how to use the O...
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Custom function batching pattern

If your functions call a remote service you may want to use a batching pattern to reduce the number of network calls to the service.
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Using storage to share data between UI-less custom functions and the t...

If you need to share data values between your UI-less custom functions and the task pane, you can use the OfficeRuntime.storage object. UI-l...
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Training and certification

Explore learning paths and become a certified Microsoft 365 developer.

Training Certification

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Bring your solutions to market

Submit your Microsoft 365 App to Microsoft AppSource to make it available to consumers and businesses.

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Join the Microsoft 365 Developer Program

Get a free sandbox, tools, and other resources you need to build solutions for the Microsoft 365 platform, including:

A free Microsoft 365 E5 developer subscription
Sample data packs to automate configuration of your developer sandbox
Access to a community of Microsoft 365 experts
Personalized content recommendations

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Featured tools

Script Lab

Script lab is an Office JavaScript API tool for anyone who wants to learn about writing Office add-ins for Excel, Word, or PowerPoint.

Office Scripts

Use Office Scripts in Excel on the web to automate your common tasks. Learn how to create and edit Office Scripts and get started automating today.

Fluent UI

The official front-end framework for building experiences that fit seamlessly into Microsoft 365.

Developer Tools

Use our developer tools to build solutions for consumer and professional markets.

Office developer community

Questions

Ask questions on Microsoft Q&A.

Feature requests

Request a feature on Microsoft Tech Community.

Office assisted support

Premier/Unified Support customers get enterprise-level support for Office development.

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Documentation

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Community calls

Training

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