TOML to JSON Converter
Convert TOML (Tom's Obvious, Minimal Language) configuration files to JSON format. Perfect for parsing Cargo.toml, pyproject.toml, and other TOML configs into JSON for processing.
Conversion Options
Recommended Settings
TOML to JSON Use Cases
- •Parse Cargo.toml from Rust projects for build tools
- •Convert pyproject.toml to JSON for Python tooling
- •Process TOML config files in JSON-based workflows
- •Extract data from TOML for APIs or databases
- •Migrate TOML configs to JSON-based systems
JSON Format Advantages
- •Universal support across all programming languages
- •Native browser/JavaScript support without parsers
- •Standard format for REST APIs and web services
- •Better for programmatic data manipulation
- •Supports null values (unlike TOML)
Pro Tips
- •TOML tables become JSON objects with nested structure preserved
- •Array of tables [[section]] converts to JSON arrays of objects
- •All data types (strings, numbers, booleans, dates) are automatically converted
- •Conversion is 100% client-side - your config files never leave your browser
Most Popular
Pretty print enabled with 2-space indentation for readability
When to Use This Tool
Parse Cargo.toml files to extract dependencies, version info, and build metadata. Convert TOML to JSON for processing in CI/CD pipelines, dependency analyzers, or custom build tools that work with JSON.
Convert pyproject.toml to JSON for tools that need to read Python project configuration but only support JSON. Useful for custom scripts, deployment tools, or package managers that work with JSON configs.
Parse TOML configuration files in applications where you need to process configs programmatically. Convert to JSON for easier manipulation in JavaScript, Python, or any language with native JSON support.
Convert TOML configs to JSON for sending via REST APIs or storing in JSON databases. TOML is human-friendly for editing, but JSON is the standard for data interchange and storage.
Migrate from TOML-based configuration systems to JSON-based ones. Convert existing TOML configs to JSON format when switching frameworks, tools, or platforms that prefer JSON.
Process TOML configs in build pipelines that use JSON for configuration. Convert TOML to JSON for webpack, rollup, or other bundlers that expect JSON-based config formats.
How It Works
Paste TOML content into the input field
Tool parses TOML syntax and validates structure
TOML tables are converted to JSON objects
Array of tables [[section]] become JSON arrays
Nested tables become nested JSON objects
Apply formatting options (pretty print, sorting)
Copy formatted JSON or download as .json file
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by Pure JavaScript for optimal performance on modern browsers.
Secure
No data collection, no tracking, no sign-up required.
Frequently Asked Questions
What is TOML and where is it used?
TOML (Tom's Obvious, Minimal Language) is a configuration file format designed for readability. It's used by Rust (Cargo.toml), Python (pyproject.toml), and many modern dev tools. TOML has cleaner syntax than JSON for configs and supports comments.
How are TOML tables converted to JSON?
TOML tables with [section] headers become JSON objects. Nested tables like [database.connection] become nested objects in JSON. The hierarchical structure is preserved, just with JSON syntax instead of TOML.
What happens to TOML array of tables?
TOML array of tables using [[array]] syntax convert to JSON arrays containing objects. Each [[servers]] entry becomes an object in the servers array. This is how TOML represents repeated configuration blocks.
Are TOML data types preserved in JSON?
Yes! Strings, numbers, booleans, dates, and arrays are all converted to their equivalent JSON types. TOML integers become JSON numbers, TOML strings stay strings, and TOML dates become ISO 8601 date strings in JSON.
Can I convert Cargo.toml or pyproject.toml files?
Absolutely! This tool handles any valid TOML file including Cargo.toml (Rust dependencies), pyproject.toml (Python projects), or custom TOML configs. Just paste the entire file contents and get structured JSON output.
What if my TOML has syntax errors?
The converter will show a specific error message indicating what went wrong and where. TOML syntax errors like unmatched quotes, invalid characters, or malformed tables will be caught and reported with helpful messages.
How do I use the generated JSON?
Copy the JSON to use in your code, or download as a .json file for your project. You can use it in JavaScript/TypeScript directly, send it via APIs, store it in databases, or process it with any tool that accepts JSON.
Is my data secure during conversion?
Yes, completely secure! All conversion happens entirely in your browser using client-side JavaScript. Your TOML config files never leave your computer or get sent to any server. The tool works completely offline after loading.