Bouncer

Validators can be defined as plain Clojure maps and composed together, enabling reusable validation logic for complex scenarios, as shown with address-validations and person-validator examples.

Supports validation of deeply nested associative structures using path-based keys (e.g., [:address :street]), allowing for intuitive validation of complex data without manual traversal.

Custom validators can be created using the defvalidator macro or plain functions, with support for arbitrary arguments, making it easy to implement business-specific rules.

Error messages are highly customizable per validator, including internationalization, and a message-fn allows access to validation metadata for sophisticated formatting.