How does it handle authentication during migration?

The guide provides patterns for bridging legacy JWT authentication with modern schemes, ensuring the service layer can forward credentials correctly during the transition.

What is the Strangler Pattern in this context?

It is a strategy for incrementally replacing legacy .NET controllers with new Minimal API endpoints, using feature flags to safely route traffic between the old and new systems.

Which frameworks does this guide support?

It specifically focuses on migrating from .NET Framework (Express-Web-API) to .NET 6+ (Actions.API) using the MediatR request/handler pattern.

Does this guide include testing procedures?

Yes, it outlines a four-phase TDD process: capturing real behavior, creating red tests, implementing green code, and final strangler integration.

Strangler Pattern Migration Guide

Name: Strangler Pattern Migration Guide
Author: resolve-io

byresolve-io

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API Development

Guides the gradual migration of legacy .NET controllers to modern Minimal APIs using the Strangler Fig pattern.

This skill provides a comprehensive framework for incrementally replacing legacy .NET Framework systems with modern .NET 6+ architectures. It offers specific implementation patterns for controller strangling, feature flag-driven routing, and MediatR-based handler patterns, ensuring zero downtime and reliable rollback capabilities during high-risk API migrations. By following the included TDD-driven process, developers can maintain behavioral parity while modernizing their backend infrastructure.

Key Features

01Legacy authentication bridging and service-load patterns

02Feature flag-based traffic routing logic

03Incremental migration patterns for .NET controllers

041 GitHub stars

05Standardized MediatR and Minimal API implementation guides

06TDD-driven validation workflow for behavioral parity

Use Cases

01Implementing feature flags for gradual service rollouts

02Migrating .NET Framework Web API controllers to .NET 6+

03Modernizing high-traffic legacy systems without downtime

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add resolve-io/.prism strangler-pattern-guide

For use in Claude.ai and ChatGPT

Download Skill