Last updated: April 12, 2026
TOML vs YAML — Which Configuration Format in 2026?
Quick Answer
TOML is a minimal, safe configuration format with obvious syntax (used by Cargo, pyproject.toml, Hugo). YAML is more flexible with features like anchors and multi-document support (used by Kubernetes, CI/CD). TOML is safer and simpler; YAML is more powerful.
TOML vs YAML — Side by Side
| Feature | TOML | YAML |
|---|---|---|
| Syntax | INI-like sections with [headers] | Indentation-based |
| Safety | Safe — no code execution risks | Unsafe — arbitrary code possible without safe_load |
| Nesting | Flat — dotted keys for nesting | Deep nesting with indentation |
| Comments | Supported (#) | Supported (#) |
| Used By | Rust (Cargo.toml), Python (pyproject.toml) | Kubernetes, Docker Compose, GitHub Actions |
| Deep Structures | Awkward for deeply nested data | Natural for deeply nested data |
Verdict
Use TOML for application configuration (flat structures, simple values). Use YAML for infrastructure configuration (Kubernetes, CI/CD) where complex nesting and features like anchors are needed.
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