Validation

Validation is an important boundary in web applications. It ensures incoming data has the shape and constraints your application expects before that data reaches business logic or persistence. Laravel provides several validation APIs, from quick controller validation to reusable Form Request classes and custom rules. 1. Basic Validation For small request handlers, call validate() on the request: Copy use Illuminate\Http\Request; public function store(Request $request) { $validatedData = $request->validate([ 'name' => ['required', 'string', 'max:255'], 'email' => ['required', 'email', 'unique:users,email'], 'password' => ['required', 'string', 'min:8', 'confirmed'], ]); // Use $validatedData rather than the entire request payload. } For a normal browser request, Laravel redirects back with validation errors in the session. For requests expecting JSON, Laravel returns a validation error response, normally with HTTP status 422.

Input validation is an important part of any web application. It lets the server reject malformed or incomplete data before business logic runs. This tutorial builds a small API with Gin and uses go-playground/validator for declarative validation rules. Project Structure Copy project/ ├── main.go └── utils/ └── validation.go 1. Create the Gin Application Create main.go with a /register endpoint:

Input validation is one of the first defenses a web application has against malformed, incomplete, or unexpected data. Validation should run before business logic writes data to a database or triggers other side effects. This example uses Gin with go-playground/validator to validate a simple registration request. Project Structure Copy project/ ├── main.go └── utils/ └── validation.go 1. Set Up Gin Create main.go: