toml-patch

A command-line tool to apply updates from a JSON file to a TOML file, while preserving comments in the latter (thanks to toml_edit).

$ toml-patch <(echo '# test\na=true') <(echo '{"x": {"y": 42}}')
# test
a=true

[x]
y = 42

Note that the JSON document must be a JSON object and that null values will result in existing key/value pairs being removed.

By default the updated TOML document is printed to stdout, you can pass --write to instead overwrite the specified TOML file.

Limitations

• No partial updates for arrays.
• No support for setting any of TOMLs date/time types.