Convert vanilla JavaScript to Vue 3 — automatically
Hand-rolled JavaScript apps grow one querySelector at a time until state lives everywhere and nowhere: in the DOM, in globals, in closures. Adding features means archaeology, and onboarding a new developer takes weeks.
CodeShift converts vanilla JavaScript codebases to Vue 3 automatically. The engine maps your scripts, event listeners, and DOM state, then rewrites them as single-file components using the Composition API — reactive state, computed values, and typed props — on modern Vite tooling. The structure of your UI is preserved; the architecture underneath becomes maintainable. Every file is verified for behavior parity and the output ships with tests.
Target stack: Vue 3 + TypeScript + Vite
First migration on us · No credit card required
What actually gets modernized
querySelector spaghetti
Single-file components
State in the DOM & globals
Reactive refs & stores
addEventListener wiring
Declarative template bindings
Manual DOM updates
Reactivity-driven rendering
Script tags & globals
ES modules + Vite
No structure, no tests
Composition API + generated tests
How the migration engine works
Analyze
The whole repository is scanned: framework and version detected, every dependency mapped, risks flagged before a line is touched.
Plan
A dependency-aware migration plan orders files leaves-first, so everything a file imports is migrated before the file itself.
Rewrite
Each file is restructured into modern, idiomatic architecture — streamed live, with already-migrated symbols kept consistent across files.
Verify
Every file passes structural checks and an adversarial behavior-parity review; failures are repaired automatically before you see them.
Vanilla JS to Vue 3: frequently asked questions
Can plain JavaScript be converted to Vue 3 automatically?+
Yes. CodeShift traces your DOM manipulation, event listeners, and implicit state, then rewrites them as Vue 3 single-file components with the Composition API — reactive state and declarative templates that do what your imperative code did, verified file-by-file.
Why Vue 3 for a vanilla JS app?+
Vue's template syntax is the shortest conceptual hop from hand-written HTML + JS: your markup structure survives mostly intact while state and events become reactive and declarative. CodeShift also supports React as a target if you prefer.
Does it use the Options API or Composition API?+
The Composition API with <script setup> — the modern, recommended style — plus TypeScript and Vite tooling out of the box.
Will the app look the same afterwards?+
Yes by default: CodeShift preserves your existing layout and styling unless you opt into a frontend redesign during migration, in which case you pick the style and it rebuilds the UI too.
Other supported migrations
Ready to modernize your Vanilla JS codebase?
Upload it or import from GitHub — analysis is free and takes minutes.