Master Fastify with AI: Build & Debug Typed REST APIs

Master Fastify with AI: Build & Debug Typed REST APIs

This AI agent skill assists developers in building and debugging Fastify services. It manages configurations related to Fastify 5, such as encapsulation, decorators, hooks, and integrates with TypeBox for creating typed REST APIs. The skill connects seamlessly with Fastify's plugins and encapsulation models, enabling structured and validated RESTful interfaces. Additionally, it facilitates JWT authentication and supports integration with databases like Prisma, Drizzle, and pg.

What this skill does

• Scaffolds new Fastify 5 services or adds route plugins to existing projects.
• Structures Fastify plugins and determines appropriate usage of fastify-plugin.
• Defines request and response schemas via TypeBox, ensuring inferred handler types.
• Implements JWT authentication and per-route authorization using Fastify hooks.
• Integrates databases (Prisma, Drizzle, pg) with decorated, lifecycle-managed plugins.
• Centralizes error handling using setErrorHandler and @fastify/sensible.
• Writes and supports inject-based tests to verify service functionality.
• Resolves issues where Fastify patterns are mixed with Express practices.

Who it is for

This skill is designed for developers and development teams using AI coding agents like Claude Code, Cursor, and Codex, who are focused on building robust, typed REST APIs using the Fastify framework.

Use cases

• Developers setting up new Fastify-based services or enhancing existing ones with additional routes and plugins.
• Teams needing to enforce consistent type-safe APIs using TypeBox within Fastify.
• Projects requiring efficient and correct integration of JWT authentication and database connections.
• Development involving automated testing of Fastify services without external port binding.

Technical details

• Utilizes Fastify 5 framework and its ecosystem of plugins (e.g., @fastify/jwt).
• Leverages @sinclair/typebox for schema-based request-response typing.
• Integrates with logging solutions like Pino.
• Supports error handling with @fastify/sensible.
• Facilitates database management through Prisma, Drizzle, and the native pg package.
• Enables test automation with the use of app.inject() for testing interfaces.

Source & Licence

This package is built on open-source work published by Aarvion-AI (Aarvion-AI/stackwise-skills) and distributed under MIT. The original licence text and copyright notice are included in your download.

Personal and commercial use, modification and redistribution are permitted, provided the original copyright and licence notice are retained.

Your purchase covers curation, licence verification, packaging, documentation and instant delivery. It does not grant exclusive rights to the underlying open-source code, which remains available under its original licence.

Delivery & Support

• Delivery: instant — a secure download link is emailed to you as soon as payment is confirmed.
• Format: ZIP archive containing the skill files, documentation and the original licence.
• Support: support@mcpcart.com — we aim to reply within 2 business days.
• Updates: updates are included only where stated on this page.

Refunds

This is a digital product delivered immediately after purchase. By completing your order you request immediate delivery and acknowledge that, once the download has been accessed, the statutory right to cancel no longer applies to the extent permitted by law. Refund requests are handled in accordance with our published Refund Policy.

Claude, Codex, Gemini and Cursor are trademarks of their respective owners. MCP Cart is an independent marketplace and is not affiliated with, endorsed by, or sponsored by any of them. Compatibility references describe interoperability only.