Staaarter Tools

TOML to XML Converter

Parses the same simplified TOML subset this category's XML to TOML Converter produces, scalars, [section] tables, [[section]] array-of-tables, and converts it into XML. A free online tool from Staaarter, right in your browser.

Runs locallyUpdated 2026-07-23
conversionstructured-data

Overview

Introduction

Modern config files increasingly use TOML.

This tool converts a TOML file into XML for systems still built around XML config.

What Is TOML to XML Converter?

A converter that parses simplified TOML into a plain value.

It then converts that value into XML with a synthetic root.

How TOML to XML Converter Works

TOML is parsed line by line: key = value pairs, [section] headers, and [[section]] array-of-table headers build up a nested plain object.

That object is then converted to XML the same way the JSON to XML Converter does it.

When To Use TOML to XML Converter

Use it when migrating a TOML config into a system that expects XML.

It's also useful for inspecting a TOML config's structure in XML form before writing an XML-based importer for it.

Often used alongside XML to TOML Converter, INI to XML Converter and YAML to XML Converter.

Features

Advantages

  • Handles both section tables and array-of-tables, the two structural TOML features most configs actually use.
  • Runs entirely client-side.
  • Reports the line a malformed entry is on, so fixing invalid TOML is quick.

Limitations

  • Datetimes, inline tables, and dotted keys aren't parsed; a TOML file using those features won't convert as expected.
  • Every value becomes an XML text node; there's no type inference in the output beyond what was already numeric/boolean in the TOML source.

Examples

Converting a simple table

Input

debug = true

[server]
host = "localhost"
port = 8080

Output

<?xml version="1.0" encoding="UTF-8"?>
<root>
  <debug>true</debug>
  <server>
    <host>localhost</host>
    <port>8080</port>
  </server>
</root>

The [server] table becomes a nested <server> element.

Best Practices & Notes

Best Practices

  • Stick to the documented TOML subset (tables, array-of-tables, scalars, inline scalar arrays) for predictable results.
  • Use XML to TOML Converter afterward to confirm a round trip reproduces your original file.
  • Convert one file at a time and check the output before scripting a bulk migration.

Developer Notes

This composes the existing `decodeToml` parser with `jsonToXml`, no XML-serialization logic is duplicated here.

TOML to XML Converter Use Cases

  • Migrating a TOML config into an XML-based system
  • Converting a Cargo.toml- or pyproject.toml-style file into XML for a different toolchain
  • Inspecting a TOML config's structure in XML form before writing an XML-based importer for it

Common Mistakes

  • Using TOML datetimes or inline tables, they're outside this converter's supported subset.
  • Mixing dotted-key shorthand into the file, only full [section] headers are recognized.

Tips

  • Use XML to TOML Converter afterward to confirm a round trip reproduces your original file.
  • Check the FAQ above if the output doesn't look like what you expected.

References

Frequently Asked Questions