Categorical Configuration Language

CCL is a minimal configuration language for readable, composable string key-value data.

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Why CCL?

Simple human-readable syntax

CCL uses plain key = value entries. Indentation creates hierarchy without quotes, braces, or brackets.

Comments and multiline values

Unlike JSON, CCL supports comments and multiline values. Configuration files should be human-friendly.

Composable and extensible

The CCL core is string-only key-value data. Typed accessors, formatting, and other helpers build on that core.

Mathematical foundation

Category-theory-inspired composition keeps parsing, filtering, and merging predictable.

Quick Example

/= CCL supports comments and multiline values
notes =
  CCL starts with string key-value pairs.
  Optional library features build on that core.

site =
  /= Indentation creates hierarchy
  id = abcdef0123456789
  name = Example Site
  version = 1.0.0

/= Keys can contain special characters, including spaces and emojis
allowed origins =
  = https://example.com
  = https://www.example.com

status emoji = ✅