YAML Formatter & Validator

Format, validate, and convert YAML. Beautify, minify, and convert between YAML and JSON. All processing happens in your browser.

Indent:

Input

Output

Features

Format & Beautify

Clean up YAML with consistent indentation and proper formatting.

YAML to JSON

Convert YAML documents to JSON format instantly with proper structure.

JSON to YAML

Transform JSON data into clean, readable YAML format.

Validation

Check your YAML syntax and get clear error messages for invalid input.

Configurable Indent

Choose between 2-space or 4-space indentation for your output.

100% Client-side

All parsing and conversion runs in your browser. No data is sent to any server.

About YAML Formatting

YAML (YAML Ain't Markup Language) is a human-friendly data serialization format widely used for configuration files, data exchange, and document storage. Its clean syntax uses indentation to represent structure, making it easier to read than JSON for complex nested data.

Converting between YAML and JSON is a common task for developers working with configuration files, Kubernetes manifests, Docker Compose files, and CI/CD pipelines. YAML supports all JSON data types plus additional features like comments, anchors, and multi-line strings.

This tool provides YAML formatting, validation, and bidirectional conversion with JSON. Everything runs entirely in your browser using a built-in parser. There are no file size limits, no server uploads, and no registration required.

Frequently Asked Questions

What YAML features are supported?▼

The formatter supports key-value pairs, nested objects, arrays, strings, numbers, booleans, and null values. Complex features like anchors, aliases, and multi-line blocks have limited support.

Can I validate YAML without converting it?▼

Yes. Click the Validate button to check if your YAML syntax is correct without producing any converted output.

Does this handle complex YAML files?▼

The tool handles standard YAML structures including nested objects and arrays. Very complex YAML with anchors, tags, or multi-line block scalars may not parse perfectly.

Is my data safe?▼

Yes. All processing happens entirely in your browser. Your YAML and JSON data is never uploaded to any server.

What is the difference between YAML and JSON?▼

YAML is more human-readable with support for comments and less syntax overhead. JSON is stricter and more widely supported by APIs. Both represent the same underlying data structures.