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YAML formatter and validator

JSON & data

Normalize YAML indentation and run basic syntax validation checks.

Updated

YAML formatter and validator

Normalize YAML indentation and run basic syntax validation checks.

Input format: Paste YAML

Output

Quick start

How to use yaml-formatter

Enter input and view computed output.

  1. Step 1
    Enter input

    Paste or type your data in the input box.

  2. Step 2
    Compute

    The tool processes input instantly in your browser.

  3. Step 3
    Use output

    Copy output and continue your workflow.

In-depth guide

YAML formatter and validator guide

Normalize YAML indentation and run basic syntax validation checks. This tool is designed for fast local processing and practical day-to-day use.

Quick start

Paste input, review output instantly, then copy it for your workflow.

Input tips

Use one value per line for structured inputs. Common separators are handled gracefully.

Privacy

Processing runs in your browser tab for the MVP workflow, with no mandatory upload step.

When to use it vs alternatives

Use this tool for quick inspection, cleanup, conversion, and copy-paste debugging. Use your IDE formatter, schema tests, or CI checks when the same rule needs to be enforced across a repository.

Common pitfalls

  • Validate the output before committing it, especially when fixing almost-valid input.
  • Escaping, comments, trailing commas, and mixed encodings are the usual source of surprising results.
  • For production config, keep a copy of the original until the consuming system accepts the rewritten file.

Frequently asked questions

What does the YAML formatter do?

It parses your YAML and re-emits it with consistent indentation and structure, flagging syntax errors along the way.

Why does YAML break on tabs?

YAML forbids tabs for indentation; you must use spaces. A stray tab is a common cause of parse errors.

How does indentation affect meaning?

Indentation defines nesting in YAML, so changing it changes the structure. The formatter normalises it without altering the data.

Can I convert between YAML and JSON?

YAML is a superset of JSON in spirit, so valid JSON is valid YAML. Many formatters can round-trip between the two.

Why did my unquoted value change type?

Bare values like yes, no or 1.0 may be read as boolean or number. Quote them to force a string.

Is my data uploaded?

No. Formatting runs entirely in your browser.

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