TOML to JSON - Convert Rust & Python Configs

Convert TOML to JSON format instantly in your browser. Perfect for Cargo.toml, pyproject.toml configs. Free, private, supports all TOML features.

TOML Input

JSON Output

Indent:

Copied!

Fixed-Width to JSON Converter - Parse Po…

YAML to XML for SOAP & Legacy Integratio…

ICS to JSON Converter - Parse iCal Calen…

SQL INSERT to CSV Converter - Parse SQL …

EndNote XML to BibTeX - Convert Referenc…

View all Data converters →

Frequently Asked Questions

TOML (Tom's Obvious, Minimal Language) is a configuration file format designed to be easy to read and write. It's used by Rust (Cargo.toml), Python (pyproject.toml), and many other tools for configuration files.

JSON is universally supported by APIs, JavaScript applications, and data processing tools. Converting TOML configs to JSON enables integration with JSON-based systems, API consumption, and programmatic processing in languages that lack native TOML support.

Rust uses Cargo.toml for package metadata and dependencies. Python uses pyproject.toml (PEP 518) for build configuration, tool settings (black, pytest, mypy), and package metadata. Both rely on TOML's clean, unambiguous syntax.

TOML is stricter and more explicit than YAML, avoiding ambiguity. TOML has clear table syntax and native datetime types. YAML is more flexible with anchors/aliases but can be error-prone. TOML prioritizes clarity and is type-safe.

TOML datetime values (like 1979-05-27T07:32:00Z) are converted to ISO 8601 strings in JSON. Offset datetimes, local datetimes, local dates, and local times are all preserved as properly formatted strings.

Yes. Both dotted keys (server.host = 'example.com') and table headers ([server]) are converted to nested JSON objects. Tables maintain proper hierarchy in the JSON output.

Arrays of tables (like [[dependencies]] sections in Cargo.toml) are converted to JSON arrays of objects. Each table becomes a distinct object in the array, preserving the structure perfectly.

No. TOML comments (lines starting with #) are removed during parsing since JSON doesn't support comments. Only the data structure is preserved in the conversion.

Yes. Invalid TOML will display an error message with the line number and description. This helps debug TOML formatting issues before deployment.

Yes. All conversion happens entirely in your browser using JavaScript. No data is uploaded to any server. Perfect for sensitive Cargo.toml or pyproject.toml files with credentials or private config.

Related Tools