Free YAML to JSON Converter

What is this YAML to JSON converter?

A lightweight tool to turn human-friendly YAML into strict JSON for APIs, configuration, and automation. It supports common YAML features such as key/value mappings, nested indentation, and lists, and converts booleans, numbers, and nulls to proper JSON types. Processing happens locally in your browser for privacy.

How to use it

1. Paste YAML or upload a .yml/.yaml file.
2. Click Convert to transform YAML into formatted JSON.
3. Review errors if the input contains unsupported syntax, then copy or download the result.

Tips

• Supports common YAML constructs; advanced features (anchors, custom tags) are not parsed.
• Use consistent spaces for indentation (tabs are not supported in YAML).
• Quote strings that contain colons or special characters to avoid ambiguity.

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Privacy: runs entirely in your browser—no data is sent anywhere.