How do I convert YAML to JSON?

Paste YAML into this tool and it instantly outputs the equivalent JSON. The conversion preserves all data types, nested structures, and arrays. YAML comments are stripped since JSON doesn't support them.

When should I convert between YAML and JSON?

Convert YAML to JSON when your application requires JSON input (most APIs). Convert JSON to YAML when creating configuration files (Docker, Kubernetes, CI/CD) that benefit from YAML's readability and comments.

YAML to JSON Converter — Free Tool

What Is the YAML to JSON Converter?

Convert between YAML and JSON formats bidirectionally. Handle complex nested structures, arrays, multi-line strings, and comments.

Why Use This Tool?

YAML and JSON are both used for configuration and data interchange, but they have different strengths. This converter lets you switch between formats while preserving data structure and types.

How to Use This YAML JSON Converter

Paste your YAML or JSON — Enter the data you want to convert into the input area.
Select the direction — Choose YAML → JSON or JSON → YAML from the conversion toggle.
Review the output — The converted output appears instantly with proper formatting and syntax highlighting.
Copy the result — Click Copy to grab the converted data for your configuration files, API payloads, or documentation.

Tips and Best Practices

→ YAML is a superset of JSON. Every valid JSON document is also valid YAML. This means you can paste JSON into a YAML parser and it will work — but not vice versa.
→ Watch for YAML's gotchas. YAML interprets yes, no, on, off as booleans, not strings. Wrap these in quotes if you need them as strings.
→ Use JSON for APIs, YAML for configs. JSON is the standard for data exchange (APIs, web services). YAML is preferred for human-edited configuration files (Docker Compose, Kubernetes, CI/CD pipelines) because it's more readable.
→ Validate after conversion. Indentation errors in YAML can change the data structure silently. Always validate converted output — especially before deploying configuration changes.

Frequently Asked Questions

When should I use YAML vs JSON?

YAML is more human-readable and supports comments — ideal for config files (Docker Compose, CI/CD pipelines, Kubernetes). JSON is more universal for APIs and data interchange, and is natively supported by JavaScript.

Does YAML support comments?

Yes — YAML supports single-line comments with #. This is one of YAML's key advantages over JSON, which has no comment syntax.

Are there YAML features that don't convert to JSON?

YAML anchors (&) and aliases (*) for value reuse, and multi-line string blocks (| and >) have no JSON equivalent. The converter expands anchors and flattens multi-line strings during conversion.

What is the difference between YAML and JSON?+

Both are data serialization formats, but they serve different use cases. JSON uses braces and brackets with strict syntax, making it ideal for machine-to-machine data exchange. YAML uses indentation and natural syntax, making it more human-readable and preferred for configuration files. YAML supports comments; JSON does not.

Is YAML better than JSON?+

Neither is universally better — they serve different purposes. YAML is better for human-edited files (configs, CI/CD pipelines) because it's more readable and supports comments. JSON is better for data interchange (APIs, storage) because it's faster to parse, unambiguous, and universally supported by every programming language.

Can YAML files contain comments?+

Yes, YAML supports single-line comments using the # character. This is one of YAML's biggest advantages over JSON for configuration files — you can document settings, explain options, and leave notes for future maintainers directly in the file.

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Built by Derek Giordano · Part of Ultimate Design Tools

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