JSON to TOML Converter
ConvertersConvert JSON to TOML configuration format instantly in your browser. Ideal for Cargo.toml, pyproject.toml and Helm values. Swap to TOML→JSON in one click.
JSONjson
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TOMLtoml
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Input: 250 chars
About JSON to TOML Converter
The JSON to TOML converter transforms JSON documents into TOML configuration format using smol-toml — a lightweight, spec-compliant TOML 1.0 parser and serialiser. JSON objects become TOML tables (`[section]`), nested objects become dotted keys or sub-tables, and arrays of objects become TOML arrays of tables (`[[section]]`). Both editors are live — edit JSON and TOML updates instantly, or edit TOML and JSON regenerates. Swap direction with one click.
Features
- ✓Bidirectional — edit either panel and the other updates in real time
- ✓Powered by smol-toml with full TOML 1.0 spec compliance
- ✓JSON objects → TOML tables, nested objects → sub-tables
- ✓JSON arrays of objects → TOML arrays of tables ([[section]])
- ✓JSON input has interactive tree view and graph visualization
- ✓Swap direction to TOML→JSON with a single click
- ✓Download converted TOML as a .toml file
- ✓Copy output to clipboard in one click
- ✓Web Worker processing — never blocks the UI
- ✓100% client-side — data never leaves your browser
Common Use Cases
- Generating Cargo.toml package metadata from a JSON project description
- Converting pyproject.toml settings from a JSON representation
- Creating Helm chart values.toml from JSON data
- Generating .cargo/config.toml or taplo.toml from JSON configuration
- Migrating JSON application configs to TOML-based tools like Rust, Hugo, or Ruff
Frequently Asked Questions
QDoes TOML support the same types as JSON?
TOML supports strings, integers, floats, booleans, datetimes, arrays, and tables. All JSON primitive types map cleanly. TOML also has a dedicated datetime type, but JSON dates encoded as ISO 8601 strings are output as TOML strings.
QHow are JSON arrays of objects handled?
Arrays of objects become TOML arrays of tables using the `[[section]]` syntax, which is the idiomatic TOML representation.
QIs my data sent to a server?
No. All conversion runs in a Web Worker inside your browser. Nothing is transmitted to any server.