YAML & XML Formatter

Format & validate YAML, format & validate XML, or convert YAML ↔ JSON and XML ↔ JSON — all in your browser.

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Output

How to format YAML and XML

Beautify YAML or XML with your preferred indentation, validate syntax, and convert YAML to JSON or JSON to YAML.

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1. Paste your document

Paste YAML or XML — or use the sample button to see how formatting works.

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2. Pick a mode

Format YAML, format XML, or convert YAML → JSON / JSON → YAML. Choose 2 or 4 space indentation.

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3. Validate & copy

Syntax errors are reported with details. Copy the result or send it back to the input for chained conversions.

YAML powers Kubernetes manifests, GitHub Actions, Docker Compose and CI configs — where a single bad indent breaks the deploy. Formatting normalizes indentation and catches errors before your pipeline does. XML remains the format of sitemaps, RSS feeds, SVG and Maven builds. For JSON-only work, the JSON Formatter adds a collapsible tree view, and JSON Diff compares two documents.

YAML & XML FAQ

Why does my YAML fail to parse?

The usual culprits: tabs instead of spaces (YAML forbids tabs for indentation), inconsistent indent depth, a missing space after a colon, or unquoted strings that look like numbers or booleans (like version: 1.10 or answer: yes).

Can I convert YAML to JSON here?

Yes — the YAML → JSON mode parses your YAML and outputs formatted JSON. JSON → YAML works in reverse. Conversion is lossless for standard data types.

Is my data uploaded anywhere?

No. Parsing, formatting and conversion all run in your browser — nothing is sent to a server, so config files with secrets stay on your machine.

Does the XML formatter validate my document?

It checks well-formedness — matching tags, proper nesting and attribute quoting. It does not validate against a DTD or XSD schema.