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YAML Formatter & Beautifier

Format and validate YAML code online with proper indentation and syntax highlighting. Instantly checks YAML syntax errors and produces clean, readable output for configuration files.

How to Use

  1. Step 1: Paste your YAML content into the left editor.
  2. Step 2: The formatted and validated YAML appears on the right.
  3. Step 3: Copy or download the formatted YAML.

Frequently Asked Questions

What does YAML prettify do?

YAML prettify re-formats YAML with consistent indentation and spacing making it easier to read.

Will prettifying change my YAML values?

No. Prettifying only changes whitespace and formatting. The data values and structure remain identical.

Why does YAML fail to parse after formatting?

YAML requires spaces (not tabs) and consistent sibling indentation. This tool uses 2-space indentation. If formatting produces errors, check the original for tab characters, inconsistent indentation, or unquoted values containing colons followed by a space.

What common pitfalls should I watch for when formatting YAML?

Common YAML pitfalls: indentation must be consistent (mixing tabs and spaces causes errors); special values yes/no/true/false/null undergo automatic type coercion (e.g., the Norwegian country abbreviation NO is parsed as false — quote it to prevent this); a colon must be followed by a space; use | for literal multi-line strings or > for folded; date format strings (2023-01-01) are automatically parsed as date objects. Always validate YAML syntax before formatting.