Driver 01
Hiring
Fewer engineers want to work on AngularJS, which reached end of life at the end of 2021.
Migration playbook: AngularJS / Angular → React and Next.js
Angular to React and Next.js incremental migration
Move an Angular application to React and Next.js route by route, so feature work continues while the old framework is retired.
Migration drivers
Why teams make this move
Driver 02
Large initial bundles
Heavy initial downloads that slow mobile load times.
Driver 03
Ecosystem fit
Wanting React's ecosystem: Server Components, Radix UI and TanStack.
Execution sequence
How the migration runs
Each phase ends with a check you can verify — data parity, error rates, latency — and the rollback path is agreed before any traffic moves.
- 01Phase
Micro-frontend shell
A shell (single-spa or Module Federation) that hosts Angular and React side by side.
- 02Phase
Shared design tokens
One set of design tokens used by both the old and the new components.
- 03Phase
Feature-by-feature replacement
Rewriting routes in React and passing shared auth state through the shell.
- 04Phase
Next.js cutover
Retiring the Angular runtime and making Next.js the primary router.
Risk prevention
Pitfalls that derail this migration
Risk 01
State out of sync across frameworks
No single source of truth for authentication tokens and user sessions.
Risk 02
Memory leaks on route changes
Not destroying Angular scopes and DOM listeners when users navigate to React routes.
Risk 03
CSS collisions
Global Angular stylesheets leaking into React views without CSS Modules or Tailwind scoping.
Before and after
What we measure
We take a baseline before any change and report the same numbers after cutover, from your own tools. They are the evidence of whether the migration worked — not figures promised in advance.
- Initial JS
- Initial bundle per route, gzip, before and after
- Release cadence
- Feature releases per month during the migration
- Error rate
- Front-end errors per session on migrated routes
Questions
Frequently asked migration questions
It depends on the number of routes and how much state they share. With a hybrid shell, new features can ship in React straight away while legacy routes move in planned batches; we estimate after a route and dependency inventory.
Yes. React components can be mounted inside Angular views through custom elements or a thin wrapper, which is often how the first components move.
Rehearse the cutover before the real one
Tell us about your data volume, traffic and timeline. An engineer will reply within one business day to set up a call about the migration plan and its rollback path.