TOML Formatter

How to use this developer tool

1. Paste or upload the toml source you want to inspect.
2. Run Format TOML, or press Ctrl/Cmd + Enter.
3. Read the summary, diagnostics, and reported counts before using the output.
4. Copy the result or download it in the shown format.

What this developer tool does

The formatter parses supported TOML values, checks duplicate keys in their table scope, then writes normalized key = value spacing and separates table headers with one blank line.

Formatting is intentionally conservative. Multiline strings and uncommon TOML constructs are reported rather than rewritten incorrectly.

Example

The Sample button loads a representative toml source. Running it produces the same kind of formatted toml shown in the result panel, including counts that are calculated from the supplied text rather than fixed examples.

title="Example"
enabled=true
[database]
ports=[8000,8001,8002]
connection_max=5000

Use cases

• Review configuration changes before committing them.
• Diagnose format-specific problems in CI or deployment inputs.
• Create a copy-ready result for documentation or another developer tool.
• Check generated files without exposing project data to a remote service.

Tips for reliable output

• Start with the smallest input that reproduces a problem.
• Keep a copy of the original before replacing configuration files.
• Read warnings and limitations, even when the main result succeeds.
• Validate the output again with the parser used by your application.
• Use UTF-8 when saving downloaded text.

Processing details

The validation pass constructs a JavaScript representation for diagnostics, while the formatter preserves the original value spelling after trimming excess outer whitespace.

Dotted quoted keys, multiline basic or literal strings, hexadecimal/octal/binary integers, and deeply nested inline structures may require a dedicated TOML 1.0 parser.