Modernize Your Legacy Code with AI
Upload your existing codebase and let AI refactor, migrate, and modernize it. No more manual rewrites. Go Bananas analyzes your entire project — every file, every dependency, every pattern — and produces a modernized version that preserves your business logic while upgrading your technology stack.
What Go Bananas Handles
Most AI code tools only generate new applications. Go Bananas is built for the harder problem: taking an existing codebase with years of accumulated business logic and modernizing it without losing what works. These are the migration scenarios the AI agent handles end-to-end.
- Framework migrations — jQuery to React, AngularJS to Next.js, PHP to Node.js, Rails to Django, Backbone to Vue, CoffeeScript to TypeScript. The AI maps legacy DOM manipulation and server-rendered templates to modern component architectures with proper state management.
- Architecture modernization — monolith to microservices, REST to GraphQL, MVC to event-driven architecture, synchronous to async messaging with queues. Includes service boundary identification and API contract generation.
- Code quality improvements — add TypeScript types to untyped JavaScript, generate unit and integration tests, introduce proper error handling and logging, replace callback hell with async/await, enforce consistent code style.
- Dependency updates — upgrade outdated npm, pip, or Composer packages, resolve breaking changes across major versions, replace deprecated APIs, and remove abandoned libraries with maintained alternatives.
- UI modernization — Bootstrap to Tailwind CSS, legacy inline styles to a modern design system, jQuery UI widgets to headless UI components, pixel-based layouts to responsive CSS Grid and Flexbox.
- Database migrations — MySQL to PostgreSQL, MongoDB to PostgreSQL, raw SQL queries to an ORM like Prisma or Drizzle, stored procedures to application-layer logic, and schema normalization.
How It Works
Upload your .zip codebase
Drag and drop your project archive. Go Bananas accepts any language, any framework, any size. The upload is encrypted and processed in an isolated sandbox.
AI analyzes architecture, dependencies, and patterns
The agent reads every file, maps import graphs, identifies framework usage, catalogs dependencies, and builds a complete understanding of your application structure before writing a single line of new code.
Intelligent migration plan generated
Based on the analysis, the AI produces a phased migration strategy: which modules to migrate first, which shared utilities to extract, where to draw service boundaries, and how to maintain backward compatibility during the transition.
Code is rewritten file-by-file with full context awareness
Unlike search-and-replace tools, the AI understands the semantic meaning of your code. It rewrites each file while maintaining awareness of how it connects to every other file in the project — imports, exports, API contracts, and shared types stay consistent.
You review changes and iterate through conversation
Every change is visible in a diff view. Ask the AI to adjust its approach, keep specific patterns you prefer, or focus on particular modules first. The modernization is collaborative, not a black box.
Why Not Just Rewrite from Scratch?
Full rewrites are one of the most common failures in software engineering. They take longer than estimated, cost more than budgeted, and frequently lose critical business logic buried in the original codebase. AI-assisted modernization avoids these risks.
- Preserves business logic and edge cases — the AI reads and understands existing conditional logic, validation rules, and edge case handling that took years to accumulate. These are carried forward into the modernized codebase, not lost in a blank-slate rewrite.
- Maintains existing data models and APIs — your database schemas, API contracts, and integration points stay compatible. Downstream consumers and upstream data sources continue working without modification.
- Incremental modernization — modernize piece by piece instead of a risky big-bang migration. Migrate one module to React while the rest stays in jQuery. Upgrade one service to TypeScript while others remain JavaScript. Ship improvements continuously.
- Cheaper and faster than a full rewrite — a legacy codebase rewrite typically costs 2-5x the original development effort. AI-assisted modernization delivers equivalent results in a fraction of the time because the AI does not need to re-discover requirements — it extracts them from the existing code.
Upload Your Codebase
Drop your legacy project as a .zip file and tell Go Bananas what you want modernized. The AI handles the rest.