Does the converter support nested tables?

Yes. Deeply nested JSON becomes nested TOML sections like [parent.child].

How are arrays of objects converted?

They become arrays of tables ([[name]]), which is the TOML way of representing a list of grouped settings.

What about dates and timestamps?

If your JSON value is a valid ISO date string, the converter writes it as a TOML datetime. Otherwise it stays a string.

Is the output compatible with Cargo.toml?

Yes, as long as your JSON has the right field names and structure for Cargo. The conversion itself produces valid TOML, but the schema is up to you.

Why TOML instead of YAML for configs?

TOML has stricter syntax and fewer footguns. It's harder to write a TOML file that parses incorrectly compared to YAML.

Can I convert TOML back to JSON?

Yes, there's a separate TOML to JSON tool for the reverse direction.

JSON to TOML Converter Online

What is JSON to TOML Conversion?

JSON to TOML conversion takes JSON data and rewrites it in TOML, a config language designed to be obvious to read. TOML uses sections in square brackets, key-value pairs with equals signs, and types that look like INI but with proper structure. A json to toml converter handles the syntax change so you don't have to rewrite anything by hand. If you've worked with Rust (Cargo.toml) or modern Python (pyproject.toml), you've already used TOML. It's the format people pick when they want config files that are easy to edit without a steep learning curve.

Why Convert JSON to TOML?

TOML is everywhere in modern toolchains, from Rust's Cargo to Python's Poetry and Hatch, plus Hugo, GitHub Actions config in some places, and a growing list of Go and Rust projects. If you have config data living as JSON and need to feed it into one of those tools, a json to toml conversion gets you there without typos. Common reasons to convert json to toml: generating a Cargo.toml or pyproject.toml from existing settings, migrating a JSON-based config to a tool that requires TOML, producing readable configs for non-developers to edit, and sharing configuration in a format that's friendlier to diff in git.

How Our JSON to TOML Converter Works

When you click Convert, the tool reads your JSON, figures out which parts should be top-level keys versus tables (TOML sections), and writes them out with the right syntax. Strings get quoted, numbers stay as numbers, booleans stay as booleans, and nested objects turn into [section] headers. Arrays become inline arrays or arrays of tables, depending on shape. Like every other tool here, the conversion runs in your browser. Nothing leaves your machine.

Features You Get

Section detection: nested objects automatically become TOML tables.
Type preservation: strings, ints, floats, booleans, and dates each get the right syntax.
Array of tables support: arrays of objects are written as [[section]] blocks.
Upload support: load a .json file from your device or drag-and-drop it into the input.
One-click copy: grab the TOML output with the Copy button and paste it into your config file.

How to Use the Tool

Paste your JSON into the input editor, or use the Upload File button to load a .json file.
Click the Convert button to generate the TOML output.
Verify the section headers and table-array blocks match what your tool expects.
Click the Copy button to copy the TOML to your clipboard.

Common Use Cases

Rust projects: building a Cargo.toml from JSON metadata.
Python projects: generating pyproject.toml from existing tool configs.
Static site generators: converting JSON content settings into TOML for Hugo or Zola.
CLI tools: many modern CLIs default to TOML for their config.

Example Conversion

Input (JSON)

{
  "package": {
    "name": "my-app",
    "version": "0.1.0",
    "authors": ["Alex"]
  }
}

Output (TOML)

[package]
name = "my-app"
version = "0.1.0"
authors = ["Alex"]

Frequently Asked Questions

Related Converters

TOML to JSON JSON to YAML JSON to XML