utilitybelt.dev
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YAML to TOML Converter

Instantly convert your YAML configuration data into clean, valid TOML format. Fast, free, and completely client-side.

YAML Input

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TOML Output

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What is YAML to TOML Converter?

YAML (YAML Ain't Markup Language) is a human-readable data serialization language frequently used for configuration files and in applications where data is being stored or transmitted. It relies heavily on indentation to define structure, making it clean to read but sometimes tricky to format perfectly. TOML (Tom's Obvious, Minimal Language) is a configuration file format designed to be easy to read and write due to obvious semantics. TOML maps unambiguously to a hash table and is designed to be highly explicit, making it less prone to indentation errors than YAML. It has seen massive adoption in modern package managers and build systems like Rust's Cargo, Python's Poetry, and Go.

Common Use Cases

  • Migrating Python Projects: Converting legacy setup.py or .yaml build configs into modern pyproject.toml standards.
  • Rust Development: Translating generic configuration structures into Cargo-compatible TOML files.
  • Static Site Generators: Converting frontmatter or configuration data (e.g., Hugo) from YAML to TOML for better readability.
  • General Config Porting: Moving application settings between different frameworks that prefer strict key-value formats over indentation-based ones.

Example: Input & Output

Sample Input

See the tool above for interactive examples.

Expected Output

The processed output will appear here instantly.

How to Use

  1. Step 1: Paste your valid YAML code into the input editor.
  2. Step 2: The tool parses your YAML and instantly translates it into TOML syntax.
  3. Step 3: If your YAML has syntax issues, the tool will highlight the parsing error so you can correct it.
  4. Step 4: Click the copy button to grab the converted TOML code for your project files.

Frequently Asked Questions

Does TOML support all YAML features?

Mostly, but not perfectly. TOML is designed for configuration, while YAML is a more complex object serialization language. Complex YAML features like custom tags or cyclic references cannot be cleanly mapped to TOML. However, standard arrays, dictionaries, strings, and booleans convert seamlessly.

Is my configuration data stored on your servers?

No. All parsing and conversion happens locally in your browser. We do not store or track your configuration data.

What happens if my YAML has syntax errors?

The converter will catch the invalid YAML and display an error message indicating where the parser failed, allowing you to fix the indentation or syntax issue before converting.

Privacy & Security

All data processing for the YAML to TOML Converter happens entirely on your local machine within your browser. No data is ever sent to our servers, ensuring your information remains private and secure. We believe in privacy by design, and our tools are built to be used without compromising your data.