YAML to TOML

Convert YAML configuration files to TOML format

Last updated: January 1, 2025

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How to use

  • Paste your YAML configuration in the input field
  • The tool converts to TOML format in real-time
  • Supports complex nested structures and data types
  • Use "Copy" to copy the result or "Download" to save as a file
  • Click "Load Sample" to see an example conversion
  • Character and line counts are displayed for both inputs

Result actions

Copy or download the tool output, or share a link to YAML to TOML.

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What is YAML to TOML Conversion?

YAML to TOML conversion transforms YAML (YAML Ain't Markup Language) configuration files into TOML (Tom's Obvious, Minimal Language) format. Both are human-readable configuration formats, but TOML is more explicit and structured, while YAML is more flexible. Converting YAML to TOML enables use of YAML configs with TOML-based tools.

Why Convert YAML to TOML?

YAML to TOML conversion enables tool compatibility:

  • Tool Requirements: Convert YAML configs to TOML for tools that require TOML (like Cargo, Poetry)
  • Explicit Structure: TOML's explicit structure can be easier to work with than YAML
  • Type Safety: TOML's explicit typing can prevent configuration errors
  • Standardization: Standardize on TOML format across projects
  • Build Tools: Use TOML format with build tools that prefer TOML

Common Use Cases

Build Tool Configuration

Convert YAML configuration to TOML for build tools like Cargo (Rust) or Poetry (Python) that use TOML format.

Project Migration

Migrate YAML configuration files to TOML format when switching to tools that prefer TOML. Common when adopting Rust or Python Poetry.

Configuration Standardization

Standardize on TOML format across projects for consistency. TOML's explicit structure can reduce configuration errors.

DevOps Configuration

Convert YAML DevOps configuration to TOML format for tools that require TOML. Some modern tools prefer TOML over YAML.

Package Management

Transform YAML package configuration to TOML for package managers that use TOML format.

YAML to TOML Conversion Process

Our converter handles:

  1. YAML Parsing: Parses YAML structure including nested objects and arrays
  2. Type Conversion: Converts YAML data types to TOML equivalents
  3. Structure Mapping: Maps YAML objects to TOML tables
  4. Array Handling: Converts YAML arrays to TOML arrays
  5. Validation: Validates YAML syntax before conversion

YAML vs TOML Comparison

YAML Advantages

  • More flexible syntax
  • Supports complex structures
  • Widely used in DevOps
  • Better for complex configurations

TOML Advantages

  • More explicit and structured
  • Better type safety
  • Easier to parse
  • Preferred by some modern tools

Conversion Considerations

  • Comments: Both formats support comments, so comments are preserved
  • Data Types: YAML types map to TOML types (strings, numbers, booleans, arrays, tables)
  • Nested Structures: YAML nested objects convert to TOML nested tables
  • Arrays: YAML arrays convert to TOML arrays
  • Multi-line Strings: YAML multi-line strings convert to TOML multi-line strings

Best Practices

  • Validate YAML: Ensure YAML is valid before conversion
  • Review Output: Check converted TOML for accuracy
  • Test Integration: Test TOML output with your target tool
  • Preserve Structure: Verify nested structures are maintained
  • Backup Original: Keep original YAML files as backup

Privacy and Security

Our YAML to TOML converter processes all configuration data entirely in your browser. No YAML or TOML data is sent to our servers, ensuring complete privacy for sensitive configuration files.

Related Tools

If you need to work with YAML or TOML in other ways, check out:

  • TOML to YAML: Convert TOML back to YAML format
  • YAML to JSON: Convert YAML to JSON format
  • TOML Formatter: Format and validate TOML files