StackPatch

Key Features

• •Auto-detection scans your project to identify frameworks, folder structures, and key configuration files, enabling StackPatch to apply changes safely with zero manual setup, no matter how customized your codebase is.
• •Smart code injection adds code only where needed, respecting your existing structure and conventions—for example, integrating AuthWrapper into layout.tsx without disrupting other components.
• •File tree preview shows exactly what files will be added or modified before applying the patch, giving you full visibility and confidence in the changes.
• •Zero configuration means no config files or setup required—just run 'npx stackpatch add auth' and the tool automatically detects your framework and applies the patch.
• •You own the code: all generated code lives in your repository as clean, readable, fully editable files with no hidden dependencies, allowing complete customization.
• •Reversible patches track every change in .stackpatch/manifest.json, enabling safe reversion with a single command if you change your mind.
• •Better Auth integration is included out-of-the-box, providing production-ready authentication with providers like AuthWrapper, API routes, and login/signup pages.

Use Cases

• •Adding authentication to an existing Next.js app with a custom layout and routing structure: StackPatch auto-detects the project, integrates Better Auth with AuthWrapper in layout.tsx, and generates API routes and login pages, all without breaking existing code.
• •Rapidly prototyping a new feature by adding Redis caching or payment support: simply run the appropriate patch command and StackPatch injects the necessary code, letting you test production-ready integrations in minutes.
• •Setting up secure, production-ready authentication for a client project or internal tool: with zero configuration and auto-detection, the integration is completed quickly and safely, reducing setup time from hours to minutes.
• •Experimenting with multiple feature additions while maintaining the ability to revert: because StackPatch tracks all changes in a manifest file, you can safely try different patches and undo them if they don't fit your requirements.
• •Onboarding new team members to an existing Next.js codebase: use StackPatch to quickly add standard features like auth or payments, ensuring consistency and reducing the learning curve for common integrations.

Who is this for?

StackPatch is designed for Next.js developers at startups, agencies, and product teams who need to rapidly add production-ready features like authentication, Redis caching, or payment processing without spending hours on configuration. It is ideal for solo developers building side projects who want to avoid boilerplate bloat, as well as experienced engineers working on complex codebases who require reversible, safe integrations that respect existing structure. The tool also suits teams that need a consistent, opinionated way to add common functionality across multiple Next.js projects, ensuring best practices and reducing setup time for every developer.