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Tools/Yaml Formatter

YAML Formatter

Format, validate, and convert YAML. Switch between YAML and JSON instantly. Supports nested objects, arrays, multi-line strings, booleans, and numbers.

All processing happens in your browser — nothing is sent to our servers

About This Tool

This YAML formatter handles the most common YAML patterns: key-value pairs, nested objects (via indentation), arrays (- items), quoted and unquoted strings, numbers, booleans, null, comments, and multi-line strings (| and >). For advanced YAML features (anchors, tags, complex keys), use a dedicated YAML library.

How it works
YAML Formatting and Conversion
01Input

Raw YAML (YAML Ain't Markup Language) — a human-readable data serialization format using indentation for structure

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02Parse

YAML text parsed into a JavaScript object tree — key:value pairs, nested objects (indentation), arrays (- prefix), and scalar types

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03Validate

Structure checked for consistent indentation, valid syntax, and proper nesting — errors reported with line context

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04Convert

Bidirectional YAML ↔ JSON conversion — YAML's indentation maps to JSON's braces and brackets

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05Format

Output re-serialized with consistent indentation (2 or 4 spaces) and sorted keys if requested

Spec: YAML 1.2 (yaml.org), RFC 9512 (YAML Media Type), ECMA-404 (JSON)

YAML is a superset of JSON — any valid JSON is valid YAML. YAML adds features like comments (#), anchors (&), and multi-line strings (| and >). Be careful with implicit typing — 'no' becomes false, 'on' becomes true.

Frequently Asked Questions