Evolving Legacy Systems: Strategies for AngularJS to Modern Angular/Vue/ React Migrations

Abstract

This article examines migration strategies for transitioning legacy AngularJS applications to modern frameworks like Angular, Vue.js, and React.js. It addresses the technical challenges organizations face with outdated technologies while providing structured approaches to modernization that maintain business continuity. The content explores framework selection criteria, hybrid architecture implementation, incremental migration patterns, and component library development. Through detailed examination of bottom-up and feature-by-feature migration strategies, the article offers guidance on maintaining functionality while gradually adopting modern development practices. The incorporation of design systems and reusable component libraries further enhances migration success by improving consistency and development efficiency. The presented strategies aim to minimize disruption while maximizing the technical and business benefits of frontend modernization. By quantifying the business impact of different migration approaches, this article enables technical leaders to make informed decisions based on organizational priorities, resource constraints, and application characteristics. The frameworks for evaluation, implementation patterns, and architectural strategies provide a comprehensive roadmap for organizations at various stages of their modernization journey, regardless of application size or complexity.