What are Page Extensions in Business Central?

Page Extensions are a feature in Microsoft Dynamics 365 Business Central that allows developers to customize existing application pages without modifying Microsoft's standard code. They are developed using the AL programming language and are a key part of Business Central's extension-based development model. Instead of changing the original page object, developers create a Page Extension that adds, removes, or modifies elements while keeping the base application intact. This ensures customizations remain upgrade-safe and compatible with future Business Central releases. Using Page Extensions, developers can: Add new fields Hide existing fields Rearrange page layouts Add actions and buttons Display calculated values Modify field properties Enhance user experience For example, an organization may add a Customer Category field to the Customer Card or create a custom action that integrates with an external application. Page Extensions work alongside: Table Extensions Report Extensions Codeunits Event Subscribers This extension-based approach enables businesses to tailor Business Central to their requirements while maintaining a clean and maintainable application architecture. Benefits include: Upgrade-safe customizations Easier maintenance Better scalability Improved user experience Reduced development risk Compliance with Microsoft's One Version strategy