Redux Action Validator Middleware

redux-validator is a middleware for Redux that enables validation of action parameters before they reach the reducers. It works by inspecting the `meta.validator` field of a dispatched action, which defines validation functions and messages for properties within the `action.payload`. If any validation fails, the dispatch is aborted, and an error object containing the `err`, `msg`, `param`, and `id` of the failed validation is returned. The library is compatible with Flux Standard Actions (FSA). As of the provided information, the current version is 0.2.3, suggesting it may be an early-stage or unmaintained project with no active release cadence. Its primary differentiator is the direct integration of validation rules within the action's `meta` field, offering a localized approach to action-specific data integrity checks.