TOML Parser
Convert between TOML and JSON formats — bidirectional, 100% local processing
TOML Input
JSON Output
About TOML Parser
TOML is a configuration format designed to be easy to read, used by tools such as Cargo for Rust and pyproject.toml for Python. It maps clearly to a dictionary of values, with sections written as [tables] and typed values for strings, numbers, booleans, and dates.
This tool converts between TOML and JSON in your browser, which helps when you want to inspect how a TOML file is structured, or generate a TOML config from JSON data. Comments in TOML are not preserved in JSON because JSON has no comment syntax.
Common use cases
- Viewing a pyproject.toml or Cargo.toml as JSON to inspect its structure.
- Converting JSON settings into a TOML configuration file.
- Validating that a TOML file parses without errors.
- Checking how tables and arrays of tables are represented.
Frequently asked questions
- What is the difference between TOML and YAML?
- TOML is more explicit and less sensitive to indentation, while YAML is more flexible but easier to get subtly wrong.
- Why does my TOML fail to parse?
- Common causes are unquoted strings, duplicate keys, or a table defined twice.
- Are dates preserved?
- TOML has native date-time values, which JSON represents as strings, so the type information is lost in JSON.