Skip to main content
NeatUtility

YAML Formatter & Validator

YAML, TOML & Config100% Client-Side
Ready
YAML
0 lines0 chars
0 B / 1.91 MB
About this tool, examples & FAQ

Format and validate YAML locally with bounded alias expansion and configurable indentation.

Key facts

Verified capabilities and limits of this utility
InputYAML text
OutputValidated, consistently indented YAML
ProcessingLocal Web Worker; input is not uploaded
Maximum input2 MB

How to use

  1. Paste a YAML document into the input editor.
  2. Choose the indentation width and whether object keys should be sorted.
  3. Run the formatter; syntax errors are reported without producing misleading output.
  4. Copy or download the validated YAML, or send it to a compatible tool.

Example

Format a mapping

Input

name: toolbox
ready: true

Example output

name: toolbox
ready: true

Edge cases

Aliases

Alias expansion is bounded to protect browser resources.

Comments

Comments are retained during normal formatting; sorting keys rebuilds the data model and therefore removes comments.

Multiple documents

This version accepts one YAML document per run rather than a multi-document stream.

How it works

  1. Parses the document with YAML 1.2 rules and collects syntax diagnostics.
  2. Preserves the document structure and comments during ordinary formatting.
  3. When sorting is requested, converts through a bounded data model, recursively sorts mapping keys, and serializes the result.

Related workflows

Frequently asked questions

Is YAML uploaded?

No. Parsing and formatting run locally in a Web Worker.

Will formatting remove my comments?

Normal formatting preserves comments. Enabling key sorting rebuilds mappings and removes comments, so leave sorting off when comments matter.

What does validation check?

It checks whether the text parses as YAML. It does not validate application-specific fields or a separate schema.

References