JSON Swiss

JSON Swiss

JSON to TOML Converter

Need the reverse conversion?
TOML to JSON Converter

JSON Input

1

TOML Output

Add JSON data to see TOML output

Your converted TOML configuration will appear here

How to convert JSON to TOML

  1. Step 1 – Input JSON

    • Paste the JSON you want to convert into the left editor panel.
    • The tool works best with configuration-like usage, but supports arrays and deep nesting.
    • Use the Import button to load large config files directly.

  2. Step 2 – Verify TOML Output

    • Nested objects are converted to standard TOML tables ([section]) or inline tables.
    • Arrays of objects become Array of Tables ([[section]]).
    • Check that strings and dates are formatted correctly in the right panel.

  3. Step 3 – Use Your TOML

    • Copy the result to your clipboard for use in Cargo.toml, pyproject.toml, or other modern configs.
    • Download the .toml file for offline use.
Example: JSON to TOML
// Input JSON
{
  "package": {
    "name": "my-app",
    "version": "1.0.0"
  }
}

// Output TOML
[package]
name = "my-app"
version = "1.0.0"

Related Configuration Tools

TOML to JSON

Convert TOML files back to JSON for processing.

JSON to YAML

Another popular configuration format alternative to TOML.

Frequently Asked Questions

How are nested JSON objects converted?

Nested objects become TOML sections with dot notation. For example, {database: {host: 'localhost'}} becomes [database] with host = 'localhost'.

How are JSON arrays handled?

Simple arrays become TOML arrays with square brackets. Arrays of objects are converted to array tables using [[table.name]] syntax.

What about complex data types?

Dates are formatted as ISO 8601 strings, complex nested structures become inline tables, and special characters are properly escaped.

Can I convert JSON data directly?

Yes! You can paste JSON directly into the input editor or import JSON data from various sources using the import button.

Is my data secure?

Yes, all data processing happens entirely in your browser. Your JSON data is never sent to any server, ensuring complete privacy and security.

JSON to TOML Converter Online | JSONSwiss