YAML to JSON Converter

Convert YAML to JSON online. Paste a YAML config or document and get clean JSON instantly — handles nested mappings, sequences, flow collections, and comments, all in your browser.

Input YAML
Drop YAML file here
JSON Output

Features

📋 Practical YAML Support

  • Nested mappings and sequences via indentation
  • Inline flow collections: [a, b] and {x: 1}
  • Sequences of mappings (common in Kubernetes, CI configs)
  • Comments and quoted strings handled correctly

⚡ Privacy-First

  • All parsing happens in your browser
  • No data ever sent to a server
  • Clear errors for inconsistent indentation
  • Download or copy the resulting JSON instantly

🔄 Round-Trip Friendly

  • Pairs with our JSON to YAML converter
  • Great for Docker Compose, Kubernetes, CI/CD pipelines
  • Inspect and validate config-as-code as plain JSON
  • Feed the JSON output into any JSON Schema validator

YAML to JSON Guide

YAML is the standard configuration format for Docker Compose, Kubernetes manifests, GitHub Actions, and countless other DevOps tools. Since every valid JSON document is also valid YAML but not the reverse, converting YAML to JSON is a one-way trip that's extremely useful for validating configs, feeding them into JSON-only tools, or diffing two config revisions as structured data instead of text.

Frequently Asked Questions

Does this support the full YAML specification?

It covers the common subset used in real-world configs: mappings, sequences, flow collections, comments, and typed scalars. Advanced features like anchors/aliases (&/*), multi-document streams, and custom tags aren't supported.

How are quoted strings different from plain ones?

Plain (unquoted) scalars are type-inferred — true, 42, and null become their JSON equivalents. Quoted strings ("01234" or 'true') are always kept as literal strings, which matters for values like zip codes or version numbers.

What happens with inconsistent indentation?

YAML's structure is defined entirely by indentation, so a line that doesn't line up with any valid parent level is reported as an error rather than silently guessed at.