Validator

Validate Go structs using struct tags for declarative rules.

Updated Jan 22, 2026

Search Tags:#validation #backend #data integrity #golang #go #struct tags

Ready to run

npx skills add https://github.com/ngxtm/skill-rule --skill validator-ngxtm

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: Validator
Source: https://github.com/ngxtm/skill-rule/tree/main/rules/golang/validator
Command: npx skills add https://github.com/ngxtm/skill-rule --skill validator-ngxtm

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill simplifies and standardizes data validation in Go applications by leveraging struct tags, reducing boilerplate code and ensuring data integrity.

Core Features & Use Cases

Declarative Validation: Define validation rules directly within your Go struct definitions using tags.
Extensive Built-in Rules: Supports a wide range of common validations like required fields, string lengths, numeric ranges, email formats, URLs, UUIDs, and more.
Advanced Features: Includes support for nested structs, slices, maps, cross-field validation, conditional validation, and custom validators.
Use Case: Ensure that user registration data (like email format, password strength, and age limits) is valid before it's processed by your application.

Quick Start

Use the Validator skill to validate a User struct with required fields and email format.

Frequently Asked Questions about Validator

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

FAQPage Schema

How do I validate Go structs using struct tags?▼

You can validate Go structs using struct tags by defining validation rules directly in your struct definitions. This declarative approach reduces boilerplate code and ensures data integrity by applying constraints like required fields, string lengths, and email formats.

What Go struct validation rules are supported for common data types?▼

Common data type validation rules supported include required fields, string lengths, numeric ranges, email formats, URLs, and UUIDs. These built-in rules help standardize data validation directly within your Go struct definitions.

Can I perform cross-field validation and nested struct checks in Go?▼

Yes, you can perform cross-field validation and nested struct checks in Go. The validation mechanism supports advanced features like validating nested structures, slices, maps, and conditional validation across multiple fields.

Does struct validation in Go integrate with web frameworks like Gin?▼

Yes, Go struct validation integrates with web frameworks like Gin for request validation. This allows you to automatically validate incoming user registration data, such as email formats and password strength, before it is processed.

How do I add custom validation logic to a Go struct?▼

You can add custom validation logic to a Go struct by utilizing the custom validator support. This allows you to define and inject specialized rules beyond the built-in constraints directly into your struct tag validation workflow.

Why should I use struct tags for backend data validation in Go?▼

Using struct tags for backend data validation in Go simplifies and standardizes the validation process. It reduces boilerplate code and ensures data integrity by declaratively defining constraints directly within your data models.