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YAML to JSON Converter

Convert YAML to JSON and vice versa. Free online YAML/JSON converter with syntax validation and pretty-print.

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What is YAML to JSON Converter?

YAML (YAML Ain't Markup Language) is a human-readable data serialization format commonly used for configuration files (Docker Compose, Kubernetes, CI/CD pipelines). Converting YAML to JSON transforms it into a format that web APIs and JavaScript applications can consume directly. JSON is also easier to validate programmatically.

How to Use

  1. Paste your YAML content in the input area
  2. The JSON output appears instantly in the result panel
  3. Toggle pretty-print for readable indentation or minified output
  4. If your YAML has syntax errors, the tool highlights the issue
  5. Copy the JSON result or swap direction to convert JSON back to YAML

Examples

Simple YAML to JSON

Inputname: Alice age: 30 active: true
Output{ "name": "Alice", "age": 30, "active": true }

Nested YAML with list

Inputserver: host: localhost ports: - 80 - 443
Output{ "server": { "host": "localhost", "ports": [80, 443] } }

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Frequently Asked Questions

Does it support YAML anchors and aliases?

Basic anchor (&) and alias (*) references are supported. Complex features like merge keys (<<:) may not be fully supported. For advanced YAML features, consider using a dedicated YAML processor.

What YAML types are preserved in JSON?

YAML strings, numbers, booleans (true/false), null, arrays, and objects are all converted to their JSON equivalents. YAML-specific types like dates and binary are converted to strings.

Can I convert JSON back to YAML?

Yes. Use the Swap button to switch the conversion direction. Paste JSON in the input and get YAML output. The resulting YAML uses standard indentation and is human-readable.