vstakhov/libucl

Health v2 · maintenance only

Adoption not part of the score

1743 stars · 160 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A C library for parsing and emitting UCL (Universal Configuration Language), an nginx-inspired configuration format fully compatible with JSON. It also supports reading and writing JSON and Messagepack, reading S-expressions, and limited YAML output.

Use cases

• parse nginx-style configuration files in C
• read and write JSON from a C application
• convert configuration between JSON, Messagepack, and UCL formats
• write human-friendly config files with comments, macros, and variables
• validate configuration files against a schema
• parse config files with includes and multiline strings

When to choose

• you need a fast, lightweight C configuration parser with JSON compatibility
• you want nginx-like config syntax with comments, macros, and variables
• you need to interoperate between JSON, Messagepack, and a friendlier config format
• you are parsing trusted, administrator-controlled configuration files

When to avoid

• you need to parse untrusted or adversarial input without disabling macros, includes, and URL fetching
• you need full YAML reading support (only limited YAML writing is available)
• you need a configuration library in a language other than C or with bindings already provided elsewhere

Facets

library · maturity stable

parser serialization configuration-management yaml developer-tools parsers apis cross-platform c windows bsd configuration-language ucl nginx-style-config messagepack s-expressions config-parser configuration linux macos

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