Overview
Awesome Config Formats is a curated list of awesome configuration formats and their respective libraries and specifications. This list covers various data serialization and configuration languages used in modern software development.
Popular Configuration Formats
YAML
Human-friendly data serialization standard with:
- Support for complex data structures
- Reference and anchoring capabilities
- Multi-line strings
- Widely used in Docker, Kubernetes, Ansible
TOML
Minimal configuration file format:
- Easy to read due to obvious semantics
- Maps unambiguously to hash tables
- Designed for config files
- Used by Rust's Cargo, Python's Poetry
JSON
Universal data interchange format:
- Simple and widely supported
- Native JavaScript support
- Strict syntax
- Used everywhere
HCL (HashiCorp Configuration Language)
Structured configuration language:
- Human and machine friendly
- Used by Terraform, Vault, Nomad
- Supports interpolation and functions
- JSON-compatible
Alternative Formats
- HanSON - JSON for Humans with unquoted identifiers and comments
- HOCON - Human-Optimized Config Object Notation
- INI - Simple key-value configuration format
- XML - Extensible markup language for configuration
Tools
- dasel - Query and update data structures using selectors from the command line
- Supports JSON, YAML, TOML, XML
- Zero runtime dependencies
- Unix-friendly
Comparison Criteria
- Human readability
- Machine parseability
- Feature richness (comments, references, types)
- Tool ecosystem
- Performance
- Error handling
Use Cases
- Application configuration
- Infrastructure as Code
- CI/CD pipelines
- Container orchestration
- API specifications
- Build systems
