FEJSONlike
FEJSONlike is a data interchange format defined as an extension of JSON, designed to be more human-friendly for front-end development and configuration use cases. It emerged from an open community in the early 2020s, with the first draft published around 2022, and has since seen adoption in web applications, tooling, and project configurations.
The core data model matches JSON, including objects, arrays, strings, numbers, booleans, and null. FEJSONlike adds
Typing extensions: FEJSONlike introduces a lightweight type annotation mechanism to represent common literals such as dates,
Practical use and tooling: Libraries exist for several languages, enabling FEJSONlike parsing and serialization, typically configurable
Limitations and interoperability: Because FEJSONlike adds nonstandard features, full interop with strict JSON tooling is not