We use OpenAPI to define APIs. There is an extension with new template generation, intellisense, snippets, etc for VS Code: https://marketplace.visualstudio.com/items?itemName=42Crunch...

The article goes into some of the detail of what makes Ballerina specifically well-designed for API implementation and consumption: strong types for APIs, endpoints and services being first-class constructs, modern protocols and data formats baked in, and so on.

The examples on the website can serve as a nice quick overview: https://ballerinalang.org/docs/by-example/

Nice to see crash report tools like CrashFeed integrated into PaaS!