Free YAML to JSON Converter

YAML (YAML Ain't Markup Language) is a human-readable data serialization format that uses indentation to represent structure instead of braces and brackets. JSON (JavaScript Object Notation) uses explicit delimiters like curly braces for objects and square brackets for arrays. YAML supports comments, multiline strings, and anchors/aliases, while JSON is stricter but more widely supported by APIs and programming languages.

Many APIs, configuration systems, and programming libraries expect JSON input. Converting YAML to JSON lets you take human-friendly configuration files and transform them into a format that tools and services can consume directly. It is also useful for validating YAML syntax by checking whether it produces valid JSON output.

Yes. This converter handles the YAML structures commonly found in Kubernetes manifests, Docker Compose files, Helm charts, and CI/CD pipeline configurations. Nested mappings, lists of objects, multiline strings for scripts and commands, and environment variable definitions all convert correctly to their JSON equivalents.

YAML anchors (marked with &) and aliases (marked with *) let you reuse values without duplication. This converter does not resolve anchors and aliases since it uses a lightweight browser-based parser. If your YAML relies on anchors, expand them manually before converting or use a full-featured YAML library in your programming language.

YAML supports two multiline string styles: literal block scalar (|) which preserves line breaks exactly as written, and folded block scalar (>) which joins lines with spaces into a single paragraph. Both styles are supported and converted to their appropriate JSON string representation with newline characters or spaces.

All conversion happens entirely in your browser using JavaScript. Your YAML content is never sent to any server or third party. This makes the tool safe for configuration files containing internal hostnames, paths, or other sensitive infrastructure details.

The converter supports key-value pairs, nested objects via indentation, arrays with dash syntax, quoted strings (single and double), inline arrays and objects, comments, multiline strings with | and > block scalars, and scalar types including strings, integers, floats, booleans (true/false, yes/no), and null values.

The converter displays an error message indicating the line number and nature of the problem. Common issues include inconsistent indentation, tabs mixed with spaces, missing colons after keys, and unmatched quotes. Fix the reported issue in your YAML input and convert again.