About TOML from YAML
Paste YAML and get TOML output in real time. Handles scalars, nested objects (converted to [sections]), arrays of scalars (inline TOML arrays), and arrays of objects (converted to [[array-of-tables]]). Null values are omitted since TOML has no null type. Use the swap button to switch to TOML → YAML. All processing runs in your browser.
Frequently Asked Questions
What is YAML to TOML conversion?
YAML to TOML conversion parses a YAML configuration file and rewrites it in TOML syntax. TOML is preferred for its explicit table structure and native date types; YAML for its concise list syntax and comment placement. Both represent the same hierarchical data.
What data types does YAML support that TOML does not, or vice versa?
YAML supports more complex types: anchors/aliases, multi-document files, and arbitrary object nesting. TOML natively supports dates and datetimes (RFC 3339) as a first-class type, while YAML treats them as strings unless explicitly tagged. TOML also has typed integer and float semantics clearer than YAML's implicit type detection.
Can nested YAML objects be converted to TOML sections?
Yes. Top-level YAML keys become TOML sections ([key]) or dotted keys. Nested objects become subsections ([parent.child]). Arrays of objects become TOML array-of-tables ([[key]]). TOML's section model has a depth limit in practice — very deep nesting may need flattening for readability.
Does TOML preserve YAML comments during conversion?
No. YAML comments are discarded before conversion begins since they are not part of the parsed data model. TOML supports comments (#) but there is no way to automatically map YAML comment placement to TOML output — this would require manual addition after conversion.
When should I use TOML instead of YAML for configuration files?
Use TOML when the configuration is simple and flat, the file will be read by humans without YAML experience, or the tooling ecosystem expects it (Rust's Cargo.toml, Python's pyproject.toml, Hugo sites). Use YAML when you need comments on complex nested structures, anchors for deduplication, or when the tool chain expects YAML (Kubernetes, Ansible, GitHub Actions).
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