Use the strangler-fig pattern: run old and new side by side, migrate one route/component at a time with AI, keep tests green throughout. Never attempt a big-bang rewrite — they fail 70% of the time.
List all routes, external dependencies, and database queries in this codebase.Convert this jQuery plugin to a React component using hooks and TypeScript.| Tool | Use |
|---|---|
| Cursor agent | Multi-file translation |
| Caddy | Reverse proxy splitting |
| Playwright | Visual regression |
| Claude Code | CLI bulk refactors |
| AST-grep | Deterministic syntax rewrites |
Can AI migrate Rails to Node? Yes — controllers translate well. ActiveRecord → Prisma is clean. Business logic needs human review.
What about AngularJS to Angular? Easier than AngularJS to React due to shared Angular patterns.
Does AI preserve i18n? Only if you ask. Provide the locale files upfront.
How long does a typical migration take? Mid-sized app (50k LOC): 3-6 months with a 2-person team + AI.
Can I keep the old DB schema? Yes, and often should. Migrate schema later in a separate project.
What about SEO during migration? Keep URLs identical or set up 301 redirects. AI can generate the redirect map.
Legacy migration is the highest-value AI workflow of 2026. Strangler-fig + AI cut typical 18-month migrations to 6 months. Start with one page today. Misar Dev automates much of the translation step.
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