What is TOML to YAML Converter?
TOML (Tom's Obvious Minimal Language) is a configuration format popular in Rust (Cargo.toml) and Python (pyproject.toml). YAML is a widely-used configuration format for Kubernetes, Docker Compose, CI/CD pipelines, and more. This tool converts between the two formats: transform TOML tables into YAML mappings, arrays of tables into YAML sequences, and vice versa.
How to Use
- Choose the conversion direction using the toggle button (TOML → YAML or YAML → TOML)
- Paste your TOML or YAML content in the input area
- Click 'Convert' to generate the output
- Copy the result and use it in your project
Why Use This Tool?
Tips & Best Practices
- TOML tables [section] become YAML mappings with nested indentation
- TOML arrays of tables [[servers]] become YAML sequences with - prefix
- TOML inline tables {key = value} become compact YAML mappings
- YAML strings that look like numbers or booleans are auto-quoted in TOML output
- When converting YAML to TOML, top-level keys become [sections]
Frequently Asked Questions
How are TOML tables converted to YAML?
TOML tables [section] become YAML mappings with nested indentation. For example, [database] with host = "localhost" becomes a YAML mapping with the database key containing a nested host key.
How are arrays of tables handled?
TOML arrays of tables [[servers]] become YAML sequences (lists). Each [[servers]] entry becomes a list item with a - prefix, following standard YAML list syntax.
Can I convert YAML back to TOML?
Yes. Use the direction toggle to switch to YAML → TOML mode. Top-level keys become [sections], nested objects use dotted keys or nested sections, and YAML sequences become TOML arrays or arrays of tables.
What TOML features are supported?
The parser supports tables, arrays of tables, inline tables, basic and literal strings, multiline strings, integers, floats, booleans, datetimes, and dotted keys. This covers the features used in most Cargo.toml and pyproject.toml files.
Is my data secure?
Yes. All processing happens entirely in your browser. Your TOML and YAML content is never sent to any server. No data is collected, stored, or transmitted.