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TOML to YAML & YAML to TOML Converter

Convert configuration files bidirectionally between TOML v1.0 and YAML 1.2 with real-time syntax validation, indentation control, and zero server upload.

Presets:
YAML Indentation:
Source Configuration (TOML v1.0)24 lines
Converted Output (YAML 1.2)
Lines31
Size511 B
Root Keys4
StatusValid

100% Client-Side Privacy

Your server credentials, database passwords, and production deployment manifests are processed strictly in your local browser sandbox.

Spec-Compliant Parsers

Engineered with full TOML v1.0 (smol-toml) and YAML 1.2 core schemas supporting nested tables, multi-line scalars, and RFC 3339 timestamps.

Bidirectional Transpilation

Instantly toggle between TOML-to-YAML and YAML-to-TOML with customized indentation levels, single-click copy, and file downloads.

Technical Reference & Architecture Guide

TOML to YAML & YAML to TOML Developer Guide — Reference Guide

Complete architectural reference for converting configuration formats between TOML v1.0 and YAML 1.2 with strict type mapping, multi-line string handling, and nesting validation.

Key Parameters & Controls

indentationinteger (2 | 4)

Number of space characters used for indentation levels in the generated YAML.

quoteStylestring ('single' | 'double')

Enforcing single or double quote rules around string literals containing special characters.

inlineTablesboolean

Whether compact one-line table syntax is preserved during TOML serialization.

dateIsoFormatboolean

Maintains RFC 3339 datetime representations across both schema specifications.

Pro Tips & Best Practices

When converting pyproject.toml or Cargo.toml to YAML, inline arrays with mixed types must be standardized as TOML v1.0 permits homogeneous arrays only.

Ensure numeric strings like zip codes or port numbers are explicitly quoted in YAML to prevent automatic type coercion to octal or integer values.

Use YAML 1.2 core schema compliance to avoid legacy YAML 1.1 pitfalls where 'yes', 'no', 'on', or 'off' are unexpectedly parsed as booleans.

Common Gotchas & Troubleshooting

Check your source YAML for duplicate map keys, which are allowed by some sloppy parsers but strictly forbidden by the TOML specification.

Ensure YAML block scalar style (| or >) is matched with TOML multi-line basic strings (\"\"\") to preserve newline characters accurately.

Frequently Asked Questions

Is my configuration file transmitted to an external server?▼

No. All syntax tree parsing and cross-format transpilation run exclusively in-browser using compiled JavaScript libraries.

Does this tool support TOML v1.0.0 features?▼

Yes. It supports full TOML v1.0 specifications including heterogeneous arrays, Unicode escapes, and dotted key tables.

Can I convert complex Kubernetes or Docker Compose files?▼

Yes. Deeply nested YAML maps, sequences of maps, and environment blocks are faithfully mapped to TOML table arrays.

What happens to comments during conversion?▼

Because standard TOML and YAML parsers discard comment tokens into the AST void, comments are stripped during conversion to guarantee data integrity.

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