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TOML tools

Convert TOML to JSON or YAML and back — free TOML tools for config files that run 100% in your browser, nothing leaves your device.

Data format converters

JSON to TOML — Config You Can Read Convert JSON to TOML. Tables, dotted keys and arrays of tables come out as a configuration a person can read and edit by hand.
TOML to JSON — Long IDs Survive Exactly Convert TOML to JSON. Large integers keep every digit and dates keep their offset, so the config reaches your code as it was written.
YAML to TOML — Config Files, Converted Convert a YAML config to TOML. Nested mappings become tables, ready for Cargo, pyproject or anything else that reads TOML.
TOML to YAML — Config Both Readers Agree On Convert a TOML config to YAML. Ambiguous scalars come out quoted, so an old PyYAML reader and a modern one give your app the same values.