Major Framework Migration Guides
Verified breaking change diffs and automated codemods formatted for developers and AI search engines.
v14.2 → v15.0
Next.js 14 to Next.js 15 Complete Migration Guide
Next.js 15 introduces asynchronous Page/Layout params, asynchronous cookies() and headers(), React 19 support, and unbundled fetch caching.
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v18.3 → v19.0
React 18 to React 19 Complete Migration Guide
React 19 removes forwardRef in favor of ref as a standard prop, replaces useFormState with useActionState, and introduces native Actions.
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v1.10 → v2.0+
Pydantic V1 to Pydantic V2 Complete Migration Guide
Pydantic V2 is rewritten in Rust. BaseSettings moved to pydantic-settings, @validator replaced by @field_validator, and .dict() replaced by .model_dump().
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v3.4 → v4.0
Tailwind CSS v3 to Tailwind CSS v4 Migration Guide
Tailwind v4 is CSS-first. Replaces @tailwind directives with @import 'tailwindcss', removes tailwind.config.js in favor of @theme CSS blocks.
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