YAML ↔ JSON Converter – Free Online Tool

Convert YAML to JSON or JSON to YAML instantly. Bidirectional conversion with proper formatting. 100% browser-based.

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Features

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Bidirectional Conversion

Convert YAML to JSON or JSON to YAML with a single click. Switch direction anytime.

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Validation

Invalid YAML or JSON is flagged with error details so you can fix it quickly.

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Privacy First

All conversion uses js-yaml library in your browser. Your data never leaves your device.

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One-Click Copy

Copy the converted result to your clipboard instantly.

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File Upload

Upload a .yaml, .yml, or .json file directly to convert its contents.

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Custom Options

Choose indentation style, quote type, and whether to output compact JSON.

How to Use

1

Choose Direction

Select YAML to JSON or JSON to YAML based on what you need to convert.

2

Paste Input

Paste your YAML or JSON content into the input panel.

3

View Result

The converted output appears instantly. Errors are shown if the input is invalid.

4

Copy

Copy the converted result to your clipboard or download it as a file.

Frequently Asked Questions

What is YAML?
YAML (YAML Ain't Markup Language) is a human-readable data serialization format often used for configuration files and data exchange. It uses indentation and simple syntax.
Is my data sent to a server?
No. All conversion is done locally in your browser using the js-yaml library. Your YAML and JSON data never leave your device.
Can I convert JSON with comments to YAML?
JSON doesn't support comments, but the tool can handle YAML files with comments when converting to JSON.
Are anchors and aliases supported?
Yes. YAML anchors (*alias) and merge keys (<<: *alias) are properly resolved during conversion.

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