JavaScript moves fast — ES2025, React 19, Bun, and the constant churn of frameworks. AI coding tools help, but their JavaScript knowledge cutoffs matter. Here's what worked in real projects.
Cursor
Best at understanding full-stack JS projects — reads your React components, types, and API routes together.
Quick Comparison
I tested all 6 tools against real use cases. Here's how they stack up at a glance:
| Tool | Price | Best For | Rating |
|---|---|---|---|
| Cursor | $20/mo | Full-stack JS/TS projects | 4.9/5 |
| GitHub Copilot | $10/mo | VS Code JS development | 4.7/5 |
| v0 (Vercel) | Free/$20/mo | React UI generation | 4.6/5 |
| Claude | $20/mo | Complex JS logic and debugging | 4.8/5 |
| Codeium | Free | Budget JS autocomplete | 4.3/5 |
| Bolt.new | Free/$20/mo | Full app scaffolding | 4.5/5 |
In-Depth Reviews: Top 3
Cursor
What we liked
- TypeScript type inference across files
- Understands your component library
- Auto-imports and refactoring
Watch out for
- Requires VS Code fork
- $20/mo vs Copilot's $10
v0 (Vercel)
What we liked
- Generates production-ready React components
- shadcn/ui and Tailwind output
- Iterative UI refinement with chat
Watch out for
- Only for UI — no backend logic
- Vercel ecosystem bias
Bolt.new
What we liked
- Full app from description in minutes
- Runs in browser, no setup
- Deploys to Netlify/Vercel instantly
Watch out for
- Less good at complex business logic
- Can generate bloated code
Frequently Asked Questions
What is the best AI tool for React development?
v0 by Vercel for UI components — it generates clean React with shadcn/ui and Tailwind that actually matches design specs. For full React applications, Cursor's codebase awareness handles component trees, state management, and TypeScript types better than any other tool.
Can AI build a full JavaScript app?
Bolt.new and similar tools (Lovable, Replit Agent) can scaffold functional full-stack apps from a description. The output works for MVPs and prototypes. Production-ready code requires significant review — AI tools struggle with security, performance optimization, and complex state management in large apps.
Is Copilot good for TypeScript?
Yes — GitHub Copilot has strong TypeScript completions and understands common patterns. It falls short of Cursor for large TypeScript projects where type definitions span multiple files. For TypeScript beginners, Copilot's inline suggestions are excellent for learning proper typing patterns.
Compare All AI Coding Tools Side by Side
See full feature matrices, real user ratings, and pricing details on our main comparison page.
View Full Comparison →