TOML to JSON Converter Online

What Is a TOML to JSON Converter?

A TOML to JSON converter transforms Tom's Obvious Minimal Language configuration files into JavaScript Object Notation format. TOML is designed as a minimal configuration file format that is easy to read due to its clear semantics and straightforward syntax. It is the default configuration format for Rust's Cargo package manager, Python's pyproject.toml, Hugo static site generator, and many other modern development tools.

This converter parses TOML input by processing section headers (table definitions in brackets), key-value pairs with type-aware value parsing, and nested table structures. The output is clean JSON with proper indentation. TOML's typed values are mapped to their JSON equivalents — strings remain strings, integers and floats become JSON numbers, booleans map directly, and arrays become JSON arrays. All conversion happens client-side in your browser with zero server involvement.

How to Convert TOML to JSON

1. Paste your TOML content into the input panel. Cargo.toml files, pyproject.toml, Hugo config, or any valid TOML document is accepted.
2. Click Convert to parse the TOML sections and key-value pairs into a structured JSON object.
3. Review the JSON output with TOML sections becoming nested objects and values properly typed as strings, numbers, or booleans.
4. Copy or download the JSON for programmatic processing, API consumption, or further conversion to other formats.

Why Use PinusX TOML to JSON Converter?

Rust developers, Python engineers, and DevOps professionals frequently need to convert TOML configuration to JSON for tooling integration, API usage, or cross-format validation. PinusX performs this conversion with 100% client-side processing — your Cargo.toml dependencies, pyproject.toml build configurations, and application settings never leave your browser. This ensures your project configurations, private registry URLs, and build secrets remain private, avoiding the risks demonstrated by the jsonformatter.org credential leak.

Frequently Asked Questions

What TOML features are supported?

The converter supports standard TOML features including sections (tables), key-value pairs, strings (basic and literal), integers, floats, booleans, arrays, and nested tables using dotted keys. Inline tables and more advanced TOML features may have limited support.

How are TOML sections mapped to JSON?

TOML sections defined with [section] headers become nested JSON objects. A section like [database] with keys host and port produces a JSON object with a 'database' key containing 'host' and 'port' properties. Dotted section names create nested object hierarchies.

Can I convert Cargo.toml files?

Yes. Paste your Cargo.toml content and the converter will produce a JSON representation of your Rust project configuration including package metadata, dependencies, features, and build settings.

Does this handle TOML arrays?

Yes. TOML arrays like [1, 2, 3] or ['a', 'b', 'c'] are converted to JSON arrays. Array of tables (using [[table]] syntax) is supported as well, producing JSON arrays of objects.

Is my configuration data kept private?

Absolutely. All TOML to JSON conversion runs locally in your browser. No configuration data, dependency lists, or project settings are sent to any server. Your data exists only in browser memory during the conversion.

Your data never leaves your browser. 100% client-side processing.