Validation

There are different approaches to validate your application’s incoming data.

Form and JSON validation

This project comes with cakephp/validation + selective/validation and contains some usage examples.

The cakephp/validation component is needed to validate complex form data (arrays) against a specific set of rules, and the selective/validation component collects the validation errors, throws validation exceptions and transforms the result into a proper JSON response.

Read more

• Slim 4 - Symfony Validator
• Slim 4 - CakePHP Validation

OpenAPI validation

The league/openapi-psr7-validator package can validate PSR-7 messages against OpenAPI (3.0.x) specifications expressed in YAML or JSON.

The justinrainbow/json-schema package is for validating JSON structures against a given schema.

JSON schema validation

The league/json-guard package lets you validate JSON data using json schema.

XML validation

The DOMDocument::schemaValidate method is able to validate XML files against a XSD schema.

Assertions

The webmozart/assert and beberlei/assert package provides assertions to validate method input/output with nice error messages.