Convert TOML to JSON Online for Free (no login)

TOML (Tom's Obvious, Minimal Language) is a popular config file format used in Rust projects, Hugo static sites, Python's pyproject.toml, and many other tools — but sometimes you need the same data in JSON for APIs, code, or other tools that don't read TOML. Flipper File's TOML to JSON converter parses any valid TOML input and transforms it into properly-formatted JSON instantly, right in your browser. No account needed, no data sent to a server — just paste, convert, and copy.

How to Convert TOML to JSON

1. Paste your TOML content into the input panel on the left.
2. The JSON output appears instantly on the right as you type or paste.
3. Review the formatted JSON — the converter handles tables, arrays of tables, inline tables, multiline strings, integers, floats, booleans, and datetime values.
4. Click Copy JSON to copy the result to your clipboard.
5. Optionally, use Download .json to save the output as a .json file.
   
   

Why Use Flipper File to Convert TOML to JSON?

• Instant conversion — Output updates in real time as you type; no button press required.
• Full TOML spec support — Handles tables, arrays of tables ([[section]]), inline tables, dotted keys, and all TOML data types.
• Copy or download — One-click copy to clipboard or download the result as a .json file.
• Works entirely in your browser — Your TOML data never leaves your device; nothing is sent to a server.
• Free, forever — No account, no subscription, no watermarks, no limits on input size.
• Syntax validation included — If your TOML has an error, the tool tells you exactly what's wrong so you can fix it before converting.
  
  

Frequently Asked Questions

What is TOML and why would I convert it to JSON?

TOML (Tom's Obvious, Minimal Language) is a configuration file format designed to be minimal and readable, similar to INI files but with more powerful data types. It's used in Rust's Cargo.toml, Python's pyproject.toml, Hugo's site config, and other tools. You might convert TOML to JSON when integrating with APIs, passing config data to a JavaScript application, or using tools that only accept JSON input.

Does this converter support all TOML data types?

Yes. The converter handles all standard TOML types: strings (basic and literal), integers, floats, booleans, datetimes (offset, local, and date-only), arrays, inline tables, standard tables, and arrays of tables ([[section]] syntax).

Can this converter handle large TOML files?

Yes. The tool processes everything in your browser, so there are no server-side file size limits. Very large TOML files may take a moment on older devices, but there is no hard cap.

What happens if my TOML has a syntax error?

The tool validates your TOML as you type. If it finds a problem — a missing equals sign, an invalid key, an unclosed string, or a duplicate key — you'll see a clear error message identifying the issue before any conversion is attempted.

Are TOML datetimes preserved correctly in JSON?

TOML datetime values (offset datetimes, local datetimes, and local dates) are converted to ISO 8601 strings in the JSON output, which is the standard way to represent dates in JSON.

What is the difference between a TOML table and a JSON object?

A TOML table ([section]) maps directly to a JSON object. Dotted keys like server.host = "localhost" are expanded into nested JSON objects: {"server": {"host": "localhost"}}. Arrays of tables ([[section]]) become JSON arrays of objects.

Is there a JSON to TOML option?

Flipper File also has a JSON to YAML converter and a TOML Validator. A JSON to TOML tool may be added in the future — check the developer tools section for the latest additions.

Does this tool work on mobile?

Yes. The layout is fully responsive and works on phones and tablets. Pasting TOML and copying the JSON output works as expected on mobile browsers.