Convert TOML to JSON Schema online, free. TOML is a readable configuration format built around key/value pairs and tables. JSON Schema is a vocabulary for validating and documenting the shape of JSON data. TOML to JSON Schema conversion parses your TOML against the TOML v1.0.0 grammar (https://toml.io/en/v1.0.0), builds an in-memory model of its keys, nested objects and arrays, then derives a JSON Schema that describes that shape following the JSON Schema 2020-12 conventions. Processing runs in your browser in JavaScript with no upload or server round-trip — no size limit beyond your device's memory, so multi-megabyte documents convert in milliseconds and sensitive payloads never leave your machine. Typical uses include API request/response validation, form generation and contract testing.
It maps the full structure of your TOML onto a valid JSON Schema, following the JSON Schema 2020-12 conventions. 100% free, no registration, and complete privacy — everything runs locally in your browser, so your data never touches a server.
Paste TOML and derive a JSON Schema from JSON Schema immediately. Conversion runs client-side, so there is no upload wait and large documents stay fast.
Nested TOML objects, tables and arrays are mapped faithfully onto JSON Schema.
Your TOML never leaves your device — everything is processed locally in JavaScript, with nothing logged or stored.
Unlimited conversions with no account, no quotas, and no watermark. Works on desktop and mobile.
A TOML document and its JSON Schema equivalent:
TOML input:
host = "db.internal"
port = 5432
secure = trueOutput:
{
"type": "object",
"properties": {
"host": { "type": "string" },
"port": { "type": "integer" },
"secure": { "type": "boolean" }
},
"required": ["host", "port", "secure"]
}Paste your TOML into the editor and press "Convert to JSON Schema". The tool parses it against the TOML v1.0.0 grammar, then derives a JSON Schema following JSON Schema 2020-12 conventions — instantly and entirely in your browser. You can validate or format the TOML first to be sure it is clean.
TOML values are typed and it has first-class dates and times, so they carry into JSON Schema cleanly. TOML tables become nested JSON Schema structures, and arrays-of-tables become lists.
The derived JSON Schema records the required keys and the value type of each field seen in your TOML sample. Widen it by hand if some fields are optional or can hold more than one type.
TOML (Tom's Obvious Minimal Language) (TOML) — TOML is a readable configuration format built around key/value pairs and tables. JSON Schema (JSON Schema) — JSON Schema is a vocabulary for validating and documenting the shape of JSON data. This converter maps the structure of your TOML onto JSON Schema so you can use it for API request/response validation.
Yes. Invalid TOML is flagged with a clear error before anything is converted. Common TOML problems to check are correct key/value pairs, quoted strings, and valid [table] headers. Starting from clean input keeps the generated JSON Schema accurate.
Yes. The entire TOML-to-JSON Schema conversion runs locally in your browser in JavaScript — your TOML is never uploaded, logged or stored. That matters when the data is something like Rust Cargo & Python pyproject config, which should not leave your machine.
The generated JSON Schema is ready for API request/response validation, form generation and contract testing. Copy or download it and drop it straight into your validation or codegen pipeline.
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