Validation

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

Form and JSON validation

Additional Resources

• CakePHP Validation (Slim 4 - eBook Vol. 1)
• Symfony Validator (Slim 4 - eBook Vol. 1)
• Problem Details for HTTP API (Slim 4 - eBook Vol. 3)

OpenAPI-based Validation

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

Additional Resources

• OpenAPI Validation (Slim 4 - eBook Vol. 3)

JSON schema validation

The league/json-guard package allows you to validate JSON data against a JSON schema.

XML validation

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

Additional Resources

• XML Validation (XML Validation (Slim 4 - eBook Vol. 3)

Assertion-Based Validation

For assertion based input/output validation, you may use:

• webmozart/assert
• beberlei/assert

This provides a range of assertion methods for enhanced data validation.