REON is an expressive data format similar to Ren (which is based on Red and Rebol syntax) that can be translated to/from JSON.

Notable features:

• Expressive syntax for representing various kinds of values
• Comments and free-form syntax
• Procedural macros for generating repetitive data
• JS API and CLI helper

Planned features:

• (Compact) binary data representation
• Input validation for string data (e.g. regexps, globs, queries, etc)
• Support other formats such as YAML or CSON