Free Online YAML to JSON Converter
Convert YAML data to JSON format instantly. Handles key-value pairs, nested structures, lists, and common YAML syntax with a lightweight client-side parser.
How the YAML to JSON Converter Works
This tool converts YAML (YAML Ain't Markup Language) data to JSON using a lightweight client-side parser. It handles common YAML features including key-value pairs, nested objects via indentation, lists using dash syntax, string values with or without quotes, numbers, booleans, and null values.
Supported YAML Features
The parser supports scalar values (strings, numbers, booleans, null), nested mappings using indentation, sequences (lists) using the dash prefix, quoted strings using single or double quotes, and comments starting with #. It handles most common YAML configurations you would encounter in files like docker-compose.yml, GitHub Actions workflows, or Kubernetes manifests.
YAML vs JSON Comparison
YAML is designed for human readability with minimal syntax — no braces, brackets, or commas required. JSON is optimized for machine parsing and is natively supported by all programming languages. YAML supports comments while JSON does not. Both formats can represent the same data structures. Converting YAML to JSON is useful when you need to use the data in JavaScript applications or APIs that expect JSON input.
Frequently Asked Questions
What YAML features are supported?
This lightweight parser supports key-value pairs, nested objects via indentation, lists with dash syntax, quoted strings, numbers, booleans (true/false), null values, and comments. It handles most common YAML configuration files.
Does it support multi-line strings?
This basic parser does not support YAML multi-line string syntax (| and > operators). For multi-line strings, consider wrapping the value in quotes or using a full YAML library for complex documents.
How does indentation affect parsing?
YAML uses indentation to denote nesting. Consistent indentation (typically 2 spaces) indicates that a key-value pair is a child of the previous less-indented key. Mixing tabs and spaces will cause parsing errors.
Can I convert JSON back to YAML?
This tool only converts YAML to JSON. While the reverse conversion is possible, YAML formatting preferences like indentation style and comment placement cannot be automatically determined from JSON.
Is this parser production-grade?
This is a lightweight parser designed for common YAML patterns. For production applications requiring full YAML 1.2 specification support including anchors, aliases, and multi-document streams, use a dedicated library like js-yaml.