TOML ↔ JSON Converter

Convert TOML (Tom's Obvious Minimal Language) to JSON and back. Useful for Cargo.toml, pyproject.toml, GitHub Actions, Hugo, and other config files. Validates syntax in real time, preserves table headers and arrays, and supports inline tables, multiline strings, and date-times.

Why choose TOML ↔ JSON Converter?

This tool provides instant, bidirectional conversion between TOML and JSON formats with real-time syntax validation. It eliminates the need to install desktop software or write custom scripts for configuration file translation. Operating entirely as a free online utility, it handles common developer formats like Cargo.toml and pyproject.toml with support for nested tables, arrays, and multiline strings.

Good to know: Very large configuration files or strictly offline workflows may be better suited for a local command-line tool.

How to Use TOML ↔ JSON Converter

Quickly convert configuration files between TOML and JSON formats with real-time syntax validation.

1. 1

   Select your desired conversion direction

   Choose whether you want to convert TOML to JSON or JSON to TOML using the toggle interface.

2. 2

   Paste your code into the input

   Copy your Cargo.toml, pyproject.toml, or JSON data and paste it into the primary text area.

3. 3

   Review real-time syntax validation results

   Check for any syntax errors highlighted by the tool to ensure your configuration file is valid.

4. 4

   Copy the converted output data

   Once the conversion is complete, copy the formatted result to use in your project or configuration file.

Estimated time: PT1M

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Convert TOML to JSON Online - Fast & Free Tool

Easily convert TOML to JSON and back. Validate Cargo.toml, pyproject.toml, and Hugo configs with our free online TOML ↔ JSON converter tool. Try it now!