Instant API is a framework that allows you to build type-safe web APIs with JavaScript. It eliminates the need for schema validation libraries by implementing type-safety at the HTTP interface. You can simply write a JSDoc-compliant comment block for a function that represents your API endpoint, and the framework takes care of validation, sanitization, and testing for user input. The framework also automatically generates an OpenAPI specification for your API. Instant API has been in development for six years and is a full-featured framework despite being an early release. It has been successfully used in the Autocode serverless platform to handle over 100M API requests per day.
https://github.com/instant-dev/api