TOML Editor & Converter

Output:
Indent:
TOML Input0 lines

Supported TOML features

Key-Value Pairs

Strings, integers, floats, booleans, dates (ISO 8601), and special values (inf, nan).

Tables

Standard tables [section] and nested tables [section.subsection] with dotted key support.

Arrays & Inline

Arrays [1, 2, 3] and inline tables {a = 1, b = 2} with proper nesting.

Multi-line Strings

Triple-quoted strings """...""" for multi-line content and array of tables [[products]].

Related tools: YAML ↔ JSON Converter · JSON Formatter · YAML/JSON5 Validator

What This Tool Does

TOML Editor & Converter is built for deterministic developer and agent workflows.

Parse, validate, and convert TOML to/from JSON and YAML — essential for Rust, Python, and config files.

Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Agent Invocation

Best Path For Builders

Browser workflow

Runs instantly in the browser with private local processing and copy/export-ready output.

Browser Workflow

This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.

/toml-editor/

For automation planning, fetch the canonical contract at /api/tool/toml-editor.json.

How to Use TOML Editor & Converter

  1. 1

    Paste or write TOML

    Input a TOML file (config files like Cargo.toml, pyproject.toml, or custom configs). The editor validates syntax and highlights errors.

  2. 2

    Edit interactively

    Add, modify, or remove keys and values. The editor maintains correct TOML syntax (proper quoting, nesting, arrays). Real-time validation prevents syntax errors.

  3. 3

    Convert to JSON or YAML

    Export your TOML as JSON or YAML if needed. Useful when you need to process config programmatically or use it in a language that expects JSON.

  4. 4

    Copy and deploy

    Copy the edited TOML and replace your config file. Test that your application reads the new config correctly (e.g., try building a Rust project with updated Cargo.toml).

Frequently Asked Questions

What is TOML Editor & Converter?
TOML Editor & Converter parses, validates, and converts TOML files to and from JSON and YAML. It is essential for working with Rust (Cargo.toml), Python (pyproject.toml), and other TOML-based config files.
How do I use TOML Editor & Converter?
Paste your TOML content into the editor to validate it instantly. You can also convert between TOML, JSON, and YAML formats with a single click, making it easy to migrate configuration data.
Is TOML Editor & Converter free?
Yes. This tool is free to use with immediate access—no account required.
Does TOML Editor & Converter store or send my data?
No. All processing happens entirely in your browser. Your configuration data never leaves your device — nothing is sent to any server.
Which config files use TOML format?
TOML is used by Cargo.toml (Rust), pyproject.toml (Python), Hugo, Deno, and many other tools. It is gaining popularity as a human-friendly alternative to YAML and JSON for configuration files.