JSON to TOML

How to use this developer tool

1. Paste or upload the json document you want to inspect.
2. Run Convert to TOML, or press Ctrl/Cmd + Enter.
3. Read the summary, diagnostics, and reported counts before using the output.
4. Copy the result or download it in the shown format.

What this developer tool does

The converter walks the JSON object by level, emits scalar assignments first, then writes nested tables and arrays of object tables with their full paths.

JSON null has no TOML equivalent. Remove it or choose an application-specific representation before converting.

Example

The Sample button loads a representative json document. Running it produces the same kind of toml document shown in the result panel, including counts that are calculated from the supplied text rather than fixed examples.

{
  "title": "Example",
  "enabled": true,
  "server": {
    "host": "127.0.0.1",
    "ports": [
      8080,
      8081
    ]
  },
  "workers": [
    {
      "name": "alpha",
      "active": true
    },
    {
      "name": "beta",
      "active": false
    }
  ]
}

Use cases

• Review configuration changes before committing them.
• Diagnose format-specific problems in CI or deployment inputs.
• Create a copy-ready result for documentation or another developer tool.
• Check generated files without exposing project data to a remote service.

Tips for reliable output

• Start with the smallest input that reproduces a problem.
• Keep a copy of the original before replacing configuration files.
• Read warnings and limitations, even when the main result succeeds.
• Validate the output again with the parser used by your application.
• Use UTF-8 when saving downloaded text.

Processing details

The input root must be an object because a TOML document is organized around key-value assignments. Output uses two blank-line-separated structural sections at most.

Keys that require complex quoting, mixed arrays, objects nested inside inline arrays, and values outside JavaScript’s safe integer range should be reviewed with a production TOML serializer.