TOML to YAML
ConverterConvert TOML data to YAML format with nested tables, arrays and dates, ready for Kubernetes configs, CI pipeline definitions and deployment manifests.
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About TOML to YAML
TOML and YAML are both human-oriented config formats, but their ecosystems rarely overlap: TOML dominates Rust (Cargo) and Python (pyproject.toml) toolchains, while YAML rules Kubernetes, GitHub Actions, GitLab CI, and Ansible. When migrating configuration between these worlds, this tool converts TOML to YAML locally in your browser, preserving nesting, arrays of tables, and scalar data types while keeping key order stable. The structural mapping is straightforward (TOML's bracketed [table] headers become YAML indentation, and [[array]] becomes a YAML list), but watch out for YAML type inference: a quoted string that looks like a boolean or date may be reinterpreted by a YAML parser. Results can be copied or downloaded for direct use in deployment manifests and pipeline files. For example, [server] host = localhost becomes YAML server: host: localhost — handy for aligning configuration across toolchains without uploading anything.
How to Use
- Open the TOML to YAML tool
- Select the source and target formats
- Adjust the output options as needed
- Click the Convert button; results appear in real time
- Copy or export the result
Use Cases
- Cross-ecosystem migration — Move config ideas from a Rust TOML setup into YAML-based deployment manifests.
- Unify team format — Batch-convert legacy configs when a team switches from TOML to YAML.
- Learn by comparison — See one config in both TOML and YAML to understand each syntax's trade-offs.
- Generate CI config — Convert parameters organized in TOML into the YAML GitHub Actions expects.
- Improve readability — Convert when deep nesting reads better as YAML indentation than TOML dotted paths.
- Kubernetes config prep — Convert TOML-based app settings into YAML for a ConfigMap or Helm values file.
- Documentation parity — Show the same config in both TOML and YAML forms in docs for readers familiar with either format.
FAQ
Is information lost in conversion?
Almost none. TOML and YAML data models are highly compatible — scalars, arrays, tables all map directly. Only TOML comments are lost.
How do TOML dates appear in YAML?
TOML RFC 3339 dates become YAML timestamp literals, a type YAML supports natively.
How are arrays of tables shown?
TOML [[table]] becomes a YAML list (a sequence of objects prefixed with -).
Why does my TOML fail to parse?
Common causes: unquoted special characters in keys, mismatched string quotes, or duplicate keys in the same table.
Are inline tables expanded?
Yes, into normal table structure. A single-line inline table like { a = 1 } becomes a multi-line key-value mapping in YAML with unchanged semantics.
Want JSON first?
Use the TOML to JSON tool — JSON makes a more universal intermediate format.