TOML to JSON Converter
ConvertersConvert TOML configuration files to JSON instantly in your browser. Supports all TOML types including arrays of tables. Swap to JSON→TOML in one click. Client-side.
TOMLtoml
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JSONjson
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Input: 180 chars
About TOML to JSON Converter
The TOML to JSON converter parses TOML configuration files using smol-toml and outputs formatted, indented JSON. All TOML 1.0 types are supported: strings, integers, floats, booleans, datetimes, arrays, inline tables, array of tables, and multi-line strings. Both editors stay live — edit TOML and JSON updates, or edit JSON and TOML regenerates. Swap direction with one click.
Features
- ✓Bidirectional — edit either panel and the other updates in real time
- ✓Powered by smol-toml with complete TOML 1.0 type support
- ✓TOML datetimes, integers, floats, booleans all preserved correctly
- ✓Arrays of tables ([[section]]) → JSON arrays of objects
- ✓JSON output has interactive tree view and graph visualization
- ✓Swap direction to JSON→TOML with a single click
- ✓Download converted JSON as a .json 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
- Inspecting Cargo.toml dependency trees as JSON for tooling analysis
- Converting pyproject.toml to JSON for CI/CD pipeline configuration
- Parsing Hugo config.toml to JSON for site migration scripts
- Converting Ruff or taplo TOML configs to JSON for documentation
- Extracting TOML data into JSON for API submission or storage
Frequently Asked Questions
QAre TOML datetimes preserved?
TOML datetimes are converted to ISO 8601 strings in JSON output, as JSON has no native datetime type.
QWhat is an array of tables in TOML?
TOML's `[[section]]` syntax defines an array of objects. Each `[[section]]` block appends an entry. The JSON output will have an array of objects for that key.
QIs my data sent to a server?
No. All conversion runs in a Web Worker inside your browser. Nothing is transmitted to any server.