Frontend Framework Migration Readiness Checklist

When to Use This Checklist

Use this checklist before migrating a frontend application from one framework to another, or across a major framework version. Framework migrations touch nearly every screen, so readiness work decides whether the project ships incrementally or stalls in a risky rewrite. It applies equally to React, Vue, and Angular moves, and to large version jumps such as AngularJS to Angular or Vue 2 to Vue 3.

How to Use This Checklist

Work the discovery items first. You cannot plan a migration you have not measured, so inventory the framework version, dependencies, and component counts before anything else. Rank screens by traffic and complexity to find a safe, low-risk first slice.

Next, lock in an incremental strategy. The strangler-fig pattern lets new framework code grow alongside the old app behind a feature flag, so you ship value continuously instead of betting on one cutover. Build a component parity matrix that maps every legacy component to its replacement; gaps in that matrix are your real backlog.

Guard quality with a visual regression baseline and strong end-to-end coverage taken before any code changes. These are your safety net: they tell you when a refactor changes behavior or appearance. Set a performance budget early so the new stack does not silently regress load time.

What Good Looks Like

A ready team has a complete dependency inventory, a ranked screen list, and a component parity matrix with named owners. Visual regression and end-to-end suites run green on the current app. A feature flag lets old and new code coexist, and a documented rollback path exists for every release. Stakeholders understand the timeline and the freeze windows.

Common Pitfalls

The most common failure is choosing a big-bang rewrite because it feels cleaner; it almost always runs long and blocks feature work. Teams also skip the visual regression baseline and then cannot prove the UI is unchanged. Underestimating state-management migration is another trap: moving stores or data layers often costs more than the components themselves. Finally, ignoring accessibility during the rush means shipping regressions that are expensive to fix later.

Related Resources

Pair this checklist with the strangler-fig pattern, component-driven development, and visual regression testing practices. For specific paths, see the jQuery-to-React, AngularJS-to-Angular, and Vue 2-to-Vue 3 migrations.