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YAML ↔ JSON Converter

Convert between YAML and JSON formats instantly. Validate syntax, format output, and switch directions with one click — all client-side.

YAML to JSON conversionJSON to YAML conversionSyntax validationFormatting optionsError highlightingReal-time conversion
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YAML Input

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JSON Output

Output will appear here...

How to Use the YAML ↔ JSON Converter

  1. 1Select the conversion direction: YAML → JSON or JSON → YAML
  2. 2Paste or type your YAML or JSON into the left input panel
  3. 3The converted output appears instantly in the right panel
  4. 4Use "Load YAML Sample" or "Load JSON Sample" to try a demo
  5. 5Click "Swap" to move the output into the input and reverse direction
  6. 6Click the copy button to copy the converted result to your clipboard

Frequently Asked Questions

What YAML features does this converter support?

The converter handles the most common YAML features: key-value pairs, nested objects, arrays (using - syntax), strings, numbers, booleans, null values, inline arrays/objects, multiline strings (| and > blocks), and comments. It covers roughly 90% of real-world YAML files.

Is my data sent to a server?

No. All parsing and conversion happens entirely in your browser using client-side JavaScript. Your YAML and JSON data never leaves your device, ensuring complete privacy.

What is the difference between YAML and JSON?

Both are data serialization formats. JSON uses braces, brackets, and quotes with a strict syntax. YAML uses indentation and is more human-readable, supporting comments and multi-line strings. YAML is a superset of JSON — valid JSON is also valid YAML.

Can I convert large files with this tool?

Yes, the tool runs entirely in your browser so there are no upload limits. Very large files (hundreds of thousands of lines) may slow down the interface since parsing is done client-side, but typical configuration files and API payloads work perfectly.

Why am I getting a conversion error?

Errors usually mean the input has invalid syntax. For YAML, check your indentation (use spaces, not tabs) and ensure colons have a space after them. For JSON, check for trailing commas, missing quotes around keys, or unmatched brackets. The error message will help pinpoint the issue.

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