Does it validate as well as format?

Yes — parse errors are reported with line/column. The formatter won't output invalid TOML; if input is malformed, you get the original back with an error.

What style conventions?

Inline tables on single lines; array-of-tables indented; multi-line strings with triple-quote markers. Matches the TOML spec examples.

Does it alphabetize keys?

Off by default (TOML is order-sensitive for ergonomic grouping). Toggle on for deterministic output — useful for lockfile-like files where diffs matter.

What TOML version does it target?

TOML 1.0.0 — the current spec. All 1.0 features supported: inline tables, arrays of tables, dotted keys, multi-line strings.

TOML Formatter | DevTools Surf

DevTools Surf

Example: TOML Formatter

A worked example, rendered from real sample data. Sign in to run the tool on your own input.

Input

[package]
name = "my-project"
version = "0.1.0"

[dependencies]
serde = "1.0"
tokio = { version = "1", features = ["full"] }

Output

[package]
name = "my-project"
version = "0.1.0"

[dependencies]
serde = "1.0"

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

About TOML Formatter

TOML Formatter preview - Text / String tool

Format and validate TOML configuration files. Part of the DevTools Surf developer suite. Browse more tools in the Text / String collection.

Use Cases

Formatting Cargo.toml files for consistent Rust project style
Validating pyproject.toml before publishing Python packages
Cleaning up Hugo static site configuration files
Standardizing Netlify or Cloudflare Pages deployment configs

Tips

Format Cargo.toml files for consistent Rust project configs
Validate TOML syntax to catch missing brackets or quotes
Use this to clean up pyproject.toml before committing changes

Fun Facts

TOML was created by Tom Preston-Werner (GitHub co-founder) in 2013; the name stands for 'Tom's Obvious, Minimal Language.'
TOML 1.0.0 was finally released on January 12, 2021, after 8 years of development and community feedback.
Rust's Cargo package manager adopted TOML for its manifest format (Cargo.toml) in 2014, making it the language's de facto config format.

FAQ

Does it validate as well as format?: Yes — parse errors are reported with line/column. The formatter won't output invalid TOML; if input is malformed, you get the original back with an error.
What style conventions?: Inline tables on single lines; array-of-tables indented; multi-line strings with triple-quote markers. Matches the TOML spec examples.
Does it alphabetize keys?: Off by default (TOML is order-sensitive for ergonomic grouping). Toggle on for deterministic output — useful for lockfile-like files where diffs matter.
What TOML version does it target?: TOML 1.0.0 — the current spec. All 1.0 features supported: inline tables, arrays of tables, dotted keys, multi-line strings.

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