Proper TOML tables
Nested objects become [section] tables and arrays of objects become [[array]] tables.
JSON to TOML Converter
Turn JSON settings into clean TOML with tables and arrays of tables.
Input
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Result
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Original (left)
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Modified (right)
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Differences
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About this tool
How the JSON to TOML works
Convert JSON to TOML with proper [tables], [[arrays of tables]] and inline arrays. Ideal for Cargo.toml, pyproject.toml and app configs. Runs in your browser.
How to use the JSON to TOML
- Paste a JSON object.
- Check the generated tables and arrays.
- Copy the TOML or download it as a .toml file.
JSON to TOML example
{"title":"App","server":{"port":8080,"debug":false},"hosts":["alpha","beta"]}title = "App"
hosts = ["alpha", "beta"]
[server]
port = 8080
debug = falseWhen to use it
- Writing pyproject.toml, Cargo.toml or Hugo configuration.
- Migrating JSON config files to TOML.
- Generating TOML settings from code.
Tip: Dates stay as quoted strings. If you need native TOML datetimes, remove the quotes around those values afterwards.
Readable keys
Simple keys stay bare; keys with spaces or dots are quoted automatically.
Escaped strings
Quotes, backslashes, tabs and newlines are escaped correctly.
Null handling
TOML has no null, so null values are left out and a comment tells you how many.
FAQ
Common questions
Why are some values missing?
TOML has no null value. Keys whose value is null are omitted, and the output starts with a comment counting them.
Does the top level have to be an object?
Yes. A TOML document is a table, so the JSON must be an object such as {"title": "App"}.
Which TOML version is produced?
TOML v1.0, which Cargo, Poetry, pip (pyproject.toml), Hugo and most libraries read.
Is it private?
Yes, conversion runs in your browser.
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