Convert YAML to TOML Online
Switch from YAML to TOML format with our free conversion tool. Ideal for projects using tools like Cargo or Python's pyproject.toml that prefer TOML configurations.
YAML to TOML Converter
Convert YAML configuration to TOML format
How YAML to TOML Conversion Works
YAML to TOML conversion transforms YAML configurations into TOML (Tom's Obvious, Minimal Language) format. Both are human-readable config formats, but TOML has stricter typing and different syntax for tables and arrays.
This tool maps YAML structures to TOML equivalents: nested mappings become TOML tables ([section.subsection]), arrays become TOML array syntax, and values are converted to appropriate TOML types with proper quoting.
Here's the process:
- YAML is parsed into data structure
- Nested mappings become TOML table headers
- Values are typed and formatted for TOML
- Output follows TOML specification
Example conversion:
YAML Input: title: "My App" [database] host: localhost port: 5432 TOML Output: title = "My App" [database] host = "localhost" port = 5432
When You'd Actually Use This
Rust Cargo configuration
Create Cargo.toml files. Rust uses TOML for package configuration—convert from YAML for Rust project setup.
Python pyproject.toml
Generate Python project configs. Modern Python uses pyproject.toml for build configuration—convert from YAML-based tool configs.
Hugo static site config
Configure Hugo sites. Hugo supports TOML config—convert from YAML for Hugo static site generation setup.
Build system migration
Migrate to TOML-based build systems. Tools like Poetry, Cargo, and others use TOML—convert configs during migration.
Configuration standardization
Standardize on TOML for specific tools. Some ecosystems prefer TOML—convert YAML configs to match ecosystem standards.
Cross-tool compatibility
Share configs across TOML-native tools. Convert YAML to TOML for tools that only support TOML configuration format.
What to Know About TOML Format
TOML has explicit typing. TOML distinguishes strings (quoted), integers, floats, booleans, and dates. Types are explicit, not inferred from format.
Tables use bracket syntax. TOML sections use [table] and [table.subtable] syntax. Nested YAML becomes dotted table headers.
Arrays of tables use double brackets. TOML arrays of objects use [[array]] syntax for multiple table entries with same name.
Strings require quotes. Unlike YAML, TOML requires quotes around all string values. Special characters use escape sequences.
Pro tip: TOML is less expressive than YAML. Very complex nested structures may not convert cleanly. Keep structures relatively flat for best TOML output.
Common Questions
What is TOML used for?
TOML is used for configuration files in Rust (Cargo.toml), Python (pyproject.toml), Hugo, and other tools. It's designed to be minimal and easy to read.
How are nested structures handled?
Nested YAML becomes dotted TOML table headers. parent.child.grandchild becomes [parent.child.grandchild] table section.
Does it handle arrays?
Yes. YAML arrays become TOML array syntax. Arrays of objects may become [[table]] arrays depending on structure.
Can I convert TOML back to YAML?
Yes. Use the TOML to YAML converter to reverse the process. Simple structures convert cleanly between formats.
What about comments?
Comments are preserved. YAML # comments convert to TOML # comments. Comment placement is maintained where possible.
Are dates and times supported?
Yes. YAML dates convert to TOML datetime format. TOML has strong datetime support with RFC 3339 format.
Is my data secure?
Yes. All conversion happens locally in your browser. Your configuration data never leaves your computer.
Other Free Tools
YAML Validator
Free Online YAML Validator
YAML to JSON Converter
Convert YAML to JSON Online
JSON to YAML Converter
Convert JSON to YAML Online
YAML Formatter & Beautifier
YAML Formatter and Beautifier
YAML Minifier & Compressor
YAML Minifier and Compressor
ASCII to Hex Converter
ASCII to Hex Converter: Text to Hexadecimal Translator
Barcode Generator
Free Barcode Generator
Binary to Text Converter
Binary to Text Converter
Free Printable Calendar Maker
Create & Print Your Custom Calendar
Pie Chart Maker
Free Pie Chart Maker Online