YAML to TOML
ConverterConvert YAML data to TOML format with nested structures and typed values for switching config formats across different toolchains and projects.
About YAML to TOML
When migrating from YAML to TOML — say, consolidating CI parameters into pyproject.toml — you need to convert syntax while preserving structure. This tool parses YAML locally and outputs TOML 1.0-compliant results, correctly handling nested tables, arrays of tables, and type mapping. Data never leaves the browser. Tip: Bookmark this tool for quick access whenever you need format conversion. All processing happens locally in your browser — no data upload, so feel free to paste sensitive content.
How to Use
- Open the YAML to TOML tool page
- Enter or paste your data into the input area
- View the real-time results and use the copy button to get the output
Use Cases
- Organize tool config — Consolidate scattered YAML settings into a single TOML file for a Rust/Python project.
- Standardize format — Convert legacy YAML uniformly once a team mandates TOML.
- Learn syntax — Compare YAML and TOML to understand TOML-specific structures like arrays of tables.
- Simplify config — Reorganize overly deep YAML into TOML's flatter table structure.
- Generate examples — Provide both YAML and TOML versions in docs for reference.
- Migrate CI variables — Convert GitHub Actions workflow YAML inputs into TOML to centralize config in a pyproject.toml file.
- Docker Compose to TOML — Translate docker-compose YAML service definitions into TOML for tools that read TOML-based orchestration configs.
FAQ
What happens to YAML null?
TOML has no null. Keys with null values are skipped during conversion — note these fields disappear from the result.
Are YAML anchors preserved?
No. Anchors and references are expanded into actual content before conversion, since TOML has no reference mechanism.
What do object arrays become?
They become TOML arrays of tables [[name]], with each array element as a table block.
Why are some keys quoted?
When key names contain dots, spaces, or special characters, TOML requires quoting — handled automatically.
Want JSON as an intermediate?
Use YAML to JSON then JSON to TOML — two steps give more control.
Any browser compatibility requirements?
This tool works in all modern browsers (Chrome, Firefox, Edge, Safari). No plugins or extensions required.
Can I use it offline?
After initial load, most features work offline. The core logic runs entirely in your browser with no network dependency.
Comments
Comments are stored locally in your browser. Configure Giscus for cloud-based comments.