server-scripts

Frappe controller patterns place Doctype logic and lifecycle hooks in a Python file at your_app/doctype/your_doctype/your_doctype.py. This structure ensures clear separation of concerns and reusable templates for insert, update, submit, and cancel flows.

Securing whitelisted APIs in Frappe requires applying strict permission checks within your server-side Python controllers. This approach validates user permissions before processing endpoint requests, ensuring secure server interactions across Doctypes.

Document events in Frappe trigger Python handlers during insert, update, submit, or cancel operations. These handlers can enqueue background jobs and execute database operations asynchronously, preventing blocking during server-side processing.

These server-side patterns are applicable to ERPNext module development. They provide ready-to-adapt Python code templates for controllers, whitelisted APIs, and document event handlers that validate behavior across Doctypes.

Standard patterns for Frappe database operations are needed to enforce consistent error handling and permissions. Without structured templates, server-side logic across Doctypes becomes difficult to maintain and prone to security gaps.