validator

Overview ¶

Package validator provides request validation for REST APIs using go-playground/validator with support for decimal types and JSON-based field naming.

The validator converts struct validation errors to a simple ValidationError slice with JSON-friendly field names (from struct tags, not Go field names), which is safe for inclusion in API error responses. It implements the Echo validator interface.

Basic usage:

type User struct {
    Email    string          `json:"email" validate:"required,email"`
    Age      int             `json:"age" validate:"gte=0,lte=150"`
    Balance  decimal.Decimal `json:"balance" validate:"gte=0"`
}

v := validator.DefaultRestValidator()
if err := v.Validate(&user); err != nil {
    // err is ValidationErrors with JSON field names
}

Custom validation tags and rules can be registered via the underlying Validator field.