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YAML ↔ JSON Converter

Bidirectional YAML to JSON and JSON to YAML conversion with auto-format detection and real-time preview. Perfect for configuration files, API payloads, and data migration. Files are converted locally in your browser — nothing is uploaded.

100% Local Browser Native

How to Use the YAML ↔ JSON Converter

1. Paste YAML

Paste or drop YAML source text into the input area.

2. Convert to JSON

Run the conversion; review errors or warnings line by line.

3. Copy JSON

Copy the converted output for your project.

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Frequently Asked Questions

How does auto-detection work?

Paste any content and the converter detects whether it's JSON or YAML based on syntax patterns (curly braces for JSON, indentation-based for YAML). It then converts to the other format.

What YAML features are supported?

Objects, arrays, strings, numbers, booleans, null, anchors (&), aliases (*), multi-line strings (| and >), and comments. The converter preserves all YAML-specific features.

Can I convert back and forth?

Yes. The tool is bidirectional. Paste YAML to get JSON, or paste JSON to get YAML. Real-time preview shows the output as you type.

Does it handle large files?

Files up to 1MB convert instantly. Larger files may slow the browser. For very large config files, consider CLI tools.

When using YAML ↔ JSON Converter, is my data stored?

No. All conversion happens locally in your browser. No data is sent to any server.

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Last updated October 2026