TOML to JSON Converter – Convert TOML to JSON & Back
About the TOML to JSON Converter
The TOML to JSON Converter works in both directions: turn TOML configuration files into JSON, or convert JSON data into properly structured TOML. It handles standard tables, arrays of tables, inline tables, strings, integers, floats, booleans, and nested key paths, catching invalid syntax and reporting it clearly instead of returning a broken result.
This is especially useful for developers working with Rust’s Cargo.toml, Python’s pyproject.toml, or other TOML-based config files that need to be consumed by JSON-based tooling or APIs. Once you have JSON output, the JSON Formatter can pretty-print or validate it further, and the YAML to JSON Converter is handy if your project mixes TOML and YAML config files. For tabular data that also needs to move into JSON, the CSV to JSON Converter covers that conversion path.
Our development team tested this converter against nested tables, arrays of tables, inline tables, and deliberately malformed TOML to confirm valid input converts cleanly and syntax errors are flagged with a clear message.
How to Use the TOML to JSON Converter
Select your conversion direction, either TOML to JSON or JSON to TOML, from the dropdown menu. Paste your TOML or JSON content into the input field and click Convert. The result appears below in a read-only output box, ready to copy with the Copy Output button or save with Download. Use Clear to reset the input and start fresh.
Example Usage
Input (TOML to JSON):
title = “TOML Example”
[owner]
name = “Tom Preston-Werner”
Output:
A JSON object with “title” set to TOML Example, and an “owner” object nested inside containing the name field.
Converting back from JSON to TOML reconstructs the same structure using TOML’s table headers and key-value syntax instead of nested JSON braces.
Frequently Asked Questions
Yes, both standard tables and arrays of tables are recognized and converted correctly in both directions, including their nested key paths.
The tool displays a clear error message describing the problem and shows your original input unchanged so you can correct it and try again.
Yes, integers, floats, booleans, and strings are recognized during conversion and mapped to their correct equivalent type in JSON.
Yes, inline tables are parsed into their equivalent nested JSON objects, and JSON objects can be converted back into TOML inline tables where appropriate.
Yes, it’s completely free with no signup required.
