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TOML to JSON Converter

Transforms TOML documents into JSON format, for seamless integration in APIs, configuration files, and data exchange workflows.

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What Is a TOML to JSON Converter?

Our TOML to JSON Converter is an online utility designed to quickly map text written in TOML (Tom’s Obvious, Minimal Language) into JSON (JavaScript Object Notation) format.

  • TOML: Known for its excellent human readability and commonly used for configuration files.
  • JSON: The de facto standard for data exchange on the web, widely used in API calls, frontend–backend communication, and various forms of data storage.

With this tool, you can convert formats in a single click—no need to manually rewrite tedious key–value pairs.

Why Convert TOML to JSON?

While TOML is convenient for authoring configurations, JSON offers significantly broader compatibility across the technical ecosystem:

  • API Integration: The vast majority of RESTful APIs and microservices accept JSON as their primary payload format.
  • Cross-Language Support: Almost every programming language (JavaScript, Python, Java, Go, etc.) provides native, high-performance JSON parsers.
  • Frontend Rendering: Web applications can consume JSON directly without additional transformation libraries, helping reduce frontend bundle size.

Why Choose Our Online TOML to JSON Tool?

There are many converters available, but ours stands out in several key areas:

Privacy First

All conversion logic runs entirely in your local browser. Sensitive configuration data—such as API keys or database endpoints—never leaves your machine. We do not store any conversion history, ensuring your enterprise data remains secure.

Instant Preview

Built with a responsive, real-time engine: as soon as you input TOML, the corresponding JSON is generated instantly, typically within milliseconds.

Full Support for Complex Structures

Fully supports advanced TOML features, including nested tables, inline tables, date/time formats, and multidimensional arrays.

How to Use the TOML to JSON Tool

You can complete the conversion in just three simple steps:

  1. Paste / Drag & Drop: Paste your TOML content into the “Input TOML” editor, or drag and drop a .toml file into the designated area.
  2. Automatic Conversion: The tool automatically parses the input and generates the JSON output in real time.
  3. Copy / Download: Click the “Copy” icon or the “Download” button to obtain the generated .json file.

Frequently Asked Questions

Is this conversion tool free to use?

Yes. This tool is completely free, with no usage limits, making it ideal for frequent day-to-day developer workflows.

Will my configuration data be leaked during the conversion process?

Absolutely not. The tool is implemented using pure frontend technology. All data processing happens locally in your browser and is never uploaded to any backend server.

Does it support the TOML v1.0.0 specification?

Yes. Our parser is fully compatible with the latest TOML v1.0.0 standard and supports all features, including dotted keys, date/time types, and hexadecimal numbers.

How well does the tool handle complex nested tables in TOML?

The tool fully supports TOML’s hierarchical structures. Whether you use dotted keys, standard tables ([table]), or array tables ([[array_of_tables]]), they are accurately converted into the corresponding nested JSON objects or arrays.

How are special TOML data types (such as dates or hexadecimal values) handled during conversion?

The tool strictly follows the specification. TOML offset date-times are converted into standard JSON strings, while hexadecimal, octal, and binary numbers are automatically converted into JSON-compliant decimal values.

Is the generated JSON minified or pretty-printed?

For better readability, the output is pretty-printed JSON with indentation by default, ready to be used directly in your projects.