FreeDev Tools

JSON to TOML

Convert JSON to TOML config format — tables, arrays of tables, and inline values.

Runs locally in your browser. Your input is not uploaded.

How to Use

  1. 1

    Paste a JSON object

    The top level must be an object, matching TOML's document model.

  2. 2

    Review tables

    Nested objects appear as [tables] and object arrays as [[tables]].

  3. 3

    Copy the TOML

    Paste into Cargo.toml, pyproject.toml, or your app config.

Frequently Asked Questions

TOML is a config format designed to be easy to read — it powers Cargo.toml (Rust), pyproject.toml (Python), and many app configs. This tool converts JSON structures into equivalent TOML.

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