JSON to TOML

Convert JSON into TOML format.

Overview

Converts JSON-formatted data into TOML format.
TOML is a notation designed for configuration files, used by many development tools such as Rust's Cargo.toml and Python's pyproject.toml.
Because of how TOML is specified, the source JSON must have an object (a table) at its top level. Arrays or single values such as strings or numbers cannot be converted as-is.

Usage

Enter the JSON you want to convert into the text area.
Click the "Convert" button.
The result, converted to TOML format, is displayed below. Use the "Copy" button to copy it to the clipboard.

Example

Input

{"package":{"name":"my-app","version":"0.1.0"}}

Output

[package]
name = "my-app"
version = "0.1.0"

Use Cases

Assembling a Rust (Cargo.toml) or Python (pyproject.toml) configuration in JSON and converting it to TOML
Transcribing an API response (JSON) into a TOML-formatted configuration sample for documentation
Migrating data managed as JSON to a tool that uses TOML

FAQ

Is the JSON I enter sent anywhere?

No. The conversion runs entirely in your browser, and nothing is sent to an external server.

Can JSON that is just an array be converted?

No. Because TOML requires an object (a table) at the top level, JSON whose top level is an array or a single value such as a number results in an error. JSON with an array nested inside an object can be converted.

Can I convert TOML back to JSON?

Yes. Please use the "TOML to JSON" tool.

Notes

The key order of objects preserves the property order of the input JSON as-is.
Since JSON cannot contain comments, the resulting TOML will not include any comments either. Add them manually after conversion if needed.
Converting very large JSON data (several MB or more) may make browser processing slow.

Related Tools

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Convert TOML into JSON format.

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Convert JSON into YAML format.

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