Please, before you decide to create a new tool, consider contributing to the existing ones. Thanks!

The following is a list of tools that validate AsyncAPI documents.

Link Description
Check-API It allows you to validate a local file or remote URL with a single command-line or programmatic invocation. It returns an exitCode of 0 on success and 1 on failure, making it suitable for use in Continuous Integration environments. Thanks to @PermittedSoc.