Format TOML

Normalize TOML tables, values, and arrays into consistent output.

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ToolTOML Formatter
Input
Output
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How it works

The document is parsed into TOML values, tables, arrays, and inline tables, then serialized with normalized spacing and indentation. Data types survive parsing but comments and original layout do not.

  • TOML 1.0 is the language baseline.
  • Canonical serialization makes output deterministic.

Worked example

Normalize messy Cargo.toml
Clean up a Cargo.toml with compact inline tables. The formatter expands them into proper sections
Input
											[package]
name="my-app"
version="0.1.0"
edition="2021"

[dependencies]
serde={version="1.0",features=["derive"]}
tokio={version="1",features=["full"]}
Output
												[package]
name = "my-app"
version = "0.1.0"
edition = "2021"

[dependencies.serde]
version = "1.0"
features = [ "derive" ]

[dependencies.tokio]
version = "1"
features = [ "full" ]

When to use this

Cargo.toml, pyproject.toml, and CLI configuration files use normalized TOML.

Edge cases

  • A bare date remains a TOML date value rather than a string.
  • Duplicate keys are invalid even when a later value seems intended to override.
  • Comments disappear because they are not data values.

References