JSON to TOML
Convert JSON to TOML using the @iarna/toml reference implementation. Preserves types (integers, floats, booleans, dates) and emits proper tables and inline arrays.
JSON in, TOML out
See exactly how JSON maps onto TOML — the converter on this page produces output identical to the example below.
{
"database": { "host": "localhost", "port": 5432, "enabled": true },
"servers": {
"alpha": { "ip": "10.0.0.1" },
"beta": { "ip": "10.0.0.2" }
}
}[database] host = "localhost" port = 5432 enabled = true [servers] [servers.alpha] ip = "10.0.0.1" [servers.beta] ip = "10.0.0.2"
What you'll use this for
Converting JSON to TOML is a daily task in API integration, config management, and data pipelines.
API integration
Generate Cargo.toml or pyproject.toml from JSON manifests.
Config migration
Move from JSON-based config to TOML for human-edited project files.
Data import
Bundle JSON metadata into TOML-consuming Rust or Python tools.
CI pipelines
Generate TOML configs from version-controlled JSON during builds.
How to convert JSON to TOML
Paste your JSON
Drop it into the left editor. The sample is loaded by default — clear it or click the wand to reload.
Click Convert
Or leave auto-convert on for live updates. Conversion runs entirely in your browser — no upload.
Copy or download
Copy to clipboard or save the output as config.toml.
Reverse if needed
Jump to the TOML to JSON converter for a round-trip check.
Frequently asked questions
Yes. TOML is strongly typed — integers, floats, booleans, strings, and dates remain distinct.
They become TOML tables ([section.subsection]) or inline tables for short objects.
Yes. No signup, no limits.
You'll see a clear parse error in the output panel.
Use the TOML to JSON converter for the opposite direction.
About JSON and TOML
TOML (Tom's Obvious Minimal Language) is a strongly-typed config format designed to be human-editable and unambiguous. It's the canonical format for Rust's Cargo.toml, Python's pyproject.toml, and many modern tools.
Common pitfalls
- Keys must be valid bare keys or quoted strings.
- Arrays of tables use the
[[name]]syntax — handled automatically. - Dates are ISO-8601; strings with newlines use triple-quoted literals.
- TOML cannot represent
null— null fields are omitted.