jQuery to Modern SPA Migration Checklist
A migration checklist for moving from jQuery to a modern SPA framework. It covers DOM and state inventory, the strangler-fig pattern, data-layer replacement, plugin mapping, and test safety nets.
When to Use This Checklist
Use this checklist when migrating a jQuery-based UI to a modern single-page-application (SPA) framework such as React, Vue, or Angular. jQuery code typically manipulates the DOM directly and scatters state across the page, which makes a big-bang rewrite risky. This checklist plans an incremental, low-risk migration.
How to Use This Checklist
Start with an honest inventory of jQuery usage, plugins, and every place that touches the DOM directly. Then find global state hidden in the DOM or jQuery data, because that hidden state is the hardest thing to migrate and the source of most regressions.
Use the strangler-fig pattern. Mount framework components into existing pages one section at a time, establishing a clear boundary so new and old code do not fight over the same DOM nodes. Replace jQuery AJAX with the framework's data layer as you convert each area, and map plugins to native components or modern replacements.
Keep a safety net. Add end-to-end tests for critical journeys before converting them, and capture a visual regression baseline of legacy pages. Verify that accessibility is preserved or improved in each converted section rather than lost in the rewrite.
What Good Looks Like
The migration runs incrementally with the strangler-fig pattern, framework components mounted section by section behind clear DOM boundaries. jQuery AJAX is replaced by the framework data layer, plugins are mapped to replacements, and end-to-end tests plus a visual baseline guard against regressions. Progress is tracked to completion per page.
Common Pitfalls
The biggest pitfall is letting jQuery and the framework both manipulate the same DOM nodes, producing flicker and broken behavior. Hidden state in the DOM is routinely missed, breaking converted features. Teams also attempt a full rewrite and stall, blocking feature work for months. Skipping end-to-end tests removes the only proof the conversion is safe.
Related Resources
Pair this with the strangler-fig pattern, component-driven development, and progressive enhancement. End-to-end and visual regression testing protect critical flows. See the jQuery-to-React and AngularJS-to-Angular migrations.