To convert JSON to TOML, choose your JSON data files above, adjust the options if needed and press "Convert to TOML". The TOML downloads instantly: free, with no sign-up, and the file never leaves your device.
About the JSON to TOML Converter
Convert JSON to TOML online for free, with no account and no watermark. JSON is hard for non-developers to read and does not open in Excel, so switching to TOML is the quickest way to get a valid TOML config for Rust and Python project settings, Hugo sites and application config.
The file is parsed with well-tested open-source parsers (the browser's JSON and XML parsers, js-yaml and smol-toml) and written back out as valid TOML. Because everything happens on your own device, your data files are never uploaded, stored or seen by anyone else, which makes it safe for customer lists, salary sheets, GST data and API exports.
What to expect: objects, lists, numbers, booleans and text keep their structure and types; invalid input is reported with the line of the problem so you can fix it.
How to use the JSON to TOML Converter
- Click "Choose files" or drag your JSON data files onto the box. You can add several at once.
- No settings are needed; indentation and types are handled automatically.
- Press "Convert to TOML". The conversion runs on your device and shows its progress.
- Download each TOML file, or use "Download all (ZIP)" when you converted several.
- Open the result in VS Code or Cargo to check it; your original JSON is never changed.
Tips & benchmarks
- TOML needs a table at the top level, so a list at the root is wrapped as items = [...].
- Validate the output in your target tool (for example kubectl, Cargo or your API client) before deploying it.
- Keep the file name simple (letters, numbers and hyphens) if you plan to upload the TOML to a website or government portal.
Frequently asked questions
How do I convert JSON to TOML?
Click "Choose files", select your JSON data files, adjust the options if you want, and press "Convert to TOML". The TOML downloads immediately; with several files you can download everything as one ZIP.
Is this JSON to TOML converter free and safe?
Yes. It is completely free, with no sign-up, no daily limit and no watermark. The conversion runs inside your browser, so your data files never leave your phone or computer and nothing is stored on News Appite's servers.
What happens to nested data?
Nothing is lost: objects, lists and values map one-to-one between JSON and TOML. Comments are not carried over because most formats cannot store them.
Can I convert several JSON files at once?
Yes. Add as many JSON files as you like; they are converted one after another and you can download them individually or together as a ZIP.
Does it work on iPhone, Android and Mac?
Yes. The converter works in any modern browser, including Chrome, Safari, Edge and Firefox, on Android, iPhone, iPad, Windows, macOS and Linux. No app is needed.
What is the difference between JSON and TOML?
JSON (JavaScript Object Notation) is a structured data (text) best suited to APIs, web and mobile apps, configuration and MongoDB or Firebase data. TOML (Tom's Obvious Minimal Language) is a minimal configuration format best suited to Rust and Python project settings, Hugo sites and application config.
Is there a file size limit?
There is no upload limit, because nothing is uploaded. The practical limit is your device's memory: files of a few hundred megabytes work on most computers, and phones handle smaller files comfortably.
How do I convert JSON to TOML in Python?
Load the file (json.load, yaml.safe_load or xmltodict.parse) and write it with the tomli-w package: tomli_w.dump(data, open("output.toml", "wb")). If you just need the file, this converter does it in the browser without writing any code.
JSON ko TOML kaise kare?
Is page par "Choose files" dabaiye, apni JSON file chuniye aur "Convert to TOML" par click kijiye. TOML file turant download ho jaati hai. Ye bilkul free hai, sign-up nahi chahiye, aur aapki file kisi server par upload nahi hoti.
JSON vs TOML: format comparison
| JSON | TOML | |
|---|---|---|
| Full name | JavaScript Object Notation | Tom's Obvious Minimal Language |
| Type | Structured data (text) | Minimal configuration format |
| Created by | Douglas Crockford, early 2000s (RFC 8259) | Tom Preston-Werner, 2013 (v1.0 in 2021) |
| Compression | None (text) | None (text) |
| File extension | .json | .toml |
| MIME type | application/json | application/toml |
| Best for | APIs, web and mobile apps, configuration and MongoDB or Firebase data | Rust and Python project settings, Hugo sites and application config |
| Opens in | every programming language, VS Code, Postman, browsers and databases | VS Code, Cargo, pip, Poetry, Hugo and most languages via libraries |
What is a JSON file?
JSON is the data format of the modern web: almost every API, app configuration and NoSQL database speaks it. It represents objects, arrays, numbers and text in a compact, human-readable way.
What is a TOML file?
TOML is a minimal configuration format with clear key = value pairs and [sections]. It is used by Rust's Cargo.toml, Python's pyproject.toml, Hugo and many other developer tools.
Need it the other way round? Use the TOML to JSON Converter.
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