TOML to JSON Converter
Paste a TOML document to instantly convert it into equivalent, pretty-printed JSON, with tables and nested tables mapped onto their JSON counterparts. Free online developer tool.
Paste TOML
JSON Output
JSON output will appear here...
Free TOML to JSON Converter
Paste a TOML document to instantly convert it into equivalent, pretty-printed JSON. Tables, nested tables, arrays, and inline values all map cleanly onto their JSON counterparts.
How to Use It
Paste any TOML configuration into the input box, or click "Load Example" to see a sample run. The converter parses your TOML and renders the resulting object as formatted JSON, updating live as you type.
Example
Given a TOML file with a top-level title key and an [owner] table containing a nested [owner.address] table, the tool produces a JSON object with title at the root and an owner object whose address property is itself a nested object — exactly mirroring the TOML table hierarchy.
Common Use Cases
- Converting a Rust
Cargo.tomlor Pythonpyproject.tomlto JSON for tooling that only reads JSON. - Inspecting a TOML config's structure quickly by viewing it as JSON.
- Feeding a TOML-based config into a JSON schema validator or JSON-only API.
- Debugging TOML parsing issues by comparing the parsed structure against expectations.
FAQs
Does this handle arrays of tables and nested tables correctly?
Yes — standard TOML constructs like arrays of tables ([[items]]), nested tables, and inline tables convert reliably for typical configuration files. Very unusual or deeply exotic TOML structures are rare in practice, but it's worth a quick visual check of the output for anything highly nonstandard.
How are TOML dates and times represented in JSON?
JSON has no native date type, so TOML date and datetime values are converted to their ISO 8601 string representation in the output.
Is my TOML uploaded anywhere?
No — parsing and conversion happen entirely client-side in your browser. Nothing you paste is sent to a server.