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bobmatnyc
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validated-handler

Validate Next.js API route inputs with Zod schemas.

68|19|Updated Nov 21, 2025
Search Tags:#typescript#api#validation#zod#nextjs#error-handling
One-click install
npx skills add https://github.com/bobmatnyc/claude-mpm-skills --skill validated-handler
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: validated-handler
Source: https://github.com/bobmatnyc/claude-mpm-skills/tree/main/toolchains/nextjs/api/validated-handler
Command: npx skills add https://github.com/bobmatnyc/claude-mpm-skills --skill validated-handler

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill eliminates repetitive boilerplate code for validating API request inputs in Next.js, ensuring type safety and consistent error handling.

Core Features & Use Cases

  • Automatic Input Validation: Uses Zod schemas to validate query parameters or request bodies.
  • Type Safety: Infers input types directly from Zod schemas, preventing runtime errors.
  • Boilerplate Reduction: Significantly reduces the lines of code needed for API routes.
  • Use Case: When building a Next.js API endpoint that accepts user input via query parameters, use this skill to automatically validate that input against a defined Zod schema, returning a 400 error if validation fails.

Quick Start

Use the validatedHandler to create a type-safe GET API route for fetching schools with pagination.

Frequently Asked Questions about validated-handler

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I validate API request inputs in Next.js App Router?▼

Next.js API input validation is streamlined by using a reusable handler that applies Zod schemas to validate query parameters or request bodies, automatically returning a 400 error if validation fails.

What is the best way to reduce boilerplate for type-safe Next.js API routes?▼

The best way to reduce Next.js API boilerplate is using a validated handler that infers input types directly from Zod schemas, ensuring consistent data validation and type safety without repetitive code.

How does Zod schema type inference work with Next.js server components?▼

Zod schema type inference in Next.js server components works by automatically deriving input types from the defined Zod schemas, preventing runtime errors and eliminating the need for manual type definitions.

Can I use this validated handler for both query parameters and request bodies?▼

Yes, you can use this validated handler for both query parameters and request bodies in Next.js App Router endpoints, as it uses Zod schemas to validate input and ensure type safety across different request types.

Do I need Zod installed to implement type-safe API route validation?▼

Yes, you need Zod installed to implement this type-safe API route validation, as the handler requires Zod schema definitions to validate inputs and infer TypeScript types for Next.js server components.

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