dature 0.12.3

Type-safe configuration loader for Python dataclasses with support for YAML, JSON, TOML, INI, ENV and environment variables

dature

Documentation | Changelog

Type-safe configuration loader for Python dataclasses. Load config from YAML, JSON, TOML, INI, ENV files, environment variables, and Docker secrets — with automatic type conversion, validation, and human-readable error messages.

Installation

pip install dature

With optional format support:

pip install dature[yaml]    # YAML (ruamel.yaml)
pip install dature[json5]   # JSON5
pip install dature[toml]    # TOML (toml_rs)
pip install dature[secure]  # Secret detection heuristics

Quick Start

from dataclasses import dataclass
from dature import LoadMetadata, load

@dataclass
class Config:
    host: str
    port: int
    debug: bool = False

config = load(LoadMetadata(file_="config.yaml"), Config)

Key Features

• Multiple formats — YAML, JSON, JSON5, TOML, INI, ENV, environment variables, Docker secrets
• Merging — combine multiple sources with configurable strategies (LAST_WINS, FIRST_WINS, RAISE_ON_CONFLICT)
• Validation — Annotated field validators, root validators, __post_init__ support
• Naming — automatic field name mapping (snake_case ↔ camelCase ↔ UPPER_SNAKE etc.)
• Secret masking — automatic masking in error messages and logs by field type, name, or heuristic
• ENV expansion — $VAR, ${VAR:-default} substitution in all file formats
• Special types — SecretStr, ByteSize, PaymentCardNumber, URL, Base64UrlStr
• Debug report — debug=True shows which source provided each field value
• Decorator mode — @load(meta) auto-loads config on dataclass instantiation with caching

See the documentation for detailed guides and API reference.

Requirements

• Python >= 3.12
• adaptix >= 3.0.0b11

Development

git clone https://github.com/Niccolum/dature.git
cd dature
uv sync --all-extras --all-groups

Run tests:

uv run pytest tests/ -v

Lint and type check:

uv run prek run --all-files

Build docs locally:

uv run mkdocs serve

License

Apache License 2.0