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JSON to TOML Converter Runs in your browser. No input data is sent to our server.

Paste JSON into the editor, convert it instantly, and copy or download the TOML result. This page is useful for app configuration, static site settings, package metadata, developer tooling, and structured data workflows.

TOML output

Paste content and convert it instantly.

This converter runs in your browser so you can reshape structured text, config data, and encoded values without sending working content to a remote processing service.

Convert JSON to TOML Online

Convert JSON to TOML online for config files, developer tooling, app settings, package metadata, and structured data workflows.

How to use JSON to TOML Converter

1

Paste content into the json input panel.

2

Run the converter to generate the target format instantly.

3

Copy or download the result once it looks right.

What this tool helps you do

Paste, convert, and copy results quickly

Useful for APIs, configuration files, and structured text

Sample input is built in for quick testing

Download the converted output as a file

Why this helps in text and data workflows

Converting a JSON config object into TOML for a Rust, Python, or Hugo project that expects a .toml configuration file.

Reformatting a JSON API response into TOML to use as a readable config or settings file.

Translating a JSON package manifest into TOML format for a build tool that reads .toml files.

Preparing a structured JSON data object as a TOML config block to paste into an existing project configuration.

Common problems and fixes

The JSON has a nested array of mixed types and the TOML output looks wrong.

TOML arrays must contain elements of the same type. Mixed-type arrays in JSON cannot be represented cleanly in TOML. Homogenise the array values before converting.

Keys in the JSON output contain characters that break TOML.

TOML key names cannot contain spaces or most special characters without quoting. The converter quotes them automatically, but if the target system requires bare keys, rename them in the source JSON first.

Null values in the JSON are not converting correctly.

TOML has no null type. JSON null values cannot be represented directly in TOML and will either be omitted or cause an error. Remove or replace null values before converting.

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Frequently asked questions

How do I convert JSON to TOML?

Paste your JSON into the input box, run the converter, and copy or download the generated TOML output.

Will this JSON to TOML converter validate my JSON?

Yes. Invalid JSON is rejected and the page shows an error instead of producing broken TOML.

Is this JSON to TOML converter free?

Yes. It is free to use in your browser.

Can TOML represent everything that JSON can?

Mostly. TOML supports the same core types — strings, numbers, booleans, arrays, and tables. It does not have a null type, so JSON null values cannot be directly converted.

What is TOML typically used for?

TOML is designed for configuration files that humans need to read and edit. It is the default config format for Rust (Cargo.toml), Python packaging (pyproject.toml), and static site generators like Hugo.

Can I convert back from TOML to JSON?

Yes. Use the TOML to JSON converter to go in the other direction.