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YAML JSON Converter

YAML
Enter YAML to validate... 0 lines
{ } JSON
Enter JSON to validate... 0 chars

YAML JSON Converter Features

Bidirectional Conversion

Convert YAML to JSON and JSON to YAML with a single click. Both editors work simultaneously.

Syntax Validation

Real-time validation of both YAML and JSON syntax. Errors are highlighted with helpful messages.

Auto Formatting

Format and beautify your YAML or JSON with customizable indentation. Supports 2-space, 4-space, or minified output.

100% Private

All conversion happens locally in your browser using js-yaml library. Your data never leaves your device.

Frequently Asked Questions

What is YAML and why convert to JSON?
YAML (YAML Ain't Markup Language) is a human-readable data format often used for configuration files. JSON is more widely supported by APIs and programming languages. Converting between them helps when you need to use data in different contexts.
Does YAML support all JSON features?
Yes, YAML is a superset of JSON. Any valid JSON is also valid YAML. However, YAML has additional features like comments, anchors, and aliases that JSON doesn't support, which will be lost in conversion.
What YAML features might not convert?
YAML comments (#), anchors (&), aliases (*), and some special types (timestamps, binary) may not have direct JSON equivalents. The converter handles these gracefully, but some information may be simplified.
Can I use this for Kubernetes/Docker configs?
Absolutely! This tool is perfect for converting Kubernetes manifests, Docker Compose files, CI/CD configs, and other DevOps YAML files to JSON for debugging or processing with JSON tools.
Is my data safe?
100% safe. All conversion happens locally in your browser using the js-yaml library. Your configuration files and data are never sent to any server, making it safe for sensitive configs.

Related Tools

About YAML ↔ JSON Converter

Convert between YAML and JSON online free with FreeToolBox — instantly transform YAML configuration files to JSON and back in your browser. YAML and JSON are both widely used data serialization formats. YAML is human-readable with indentation-based syntax, popular for configuration files (Docker Compose, Kubernetes, GitHub Actions, Ansible). JSON is the universal format for APIs and web applications. Switch between them without command-line tools.

All conversion happens locally in your browser using js-yaml — no data is sent to any server. Paste your YAML or JSON, click convert, and copy the output instantly. Completely free, no account required.

Frequently Asked Questions

What is the main difference between YAML and JSON?

JSON uses braces and brackets, requires quoted strings, and doesn't allow comments. YAML uses indentation for structure, doesn't require quotes for strings, and supports comments (#). YAML is a superset of JSON — valid JSON is valid YAML.

Are YAML comments preserved when converting to JSON?

No. JSON does not support comments, so any YAML comments (lines starting with #) are lost during YAML→JSON conversion. This is a fundamental limitation of the JSON format.

What YAML features might not convert perfectly?

YAML-specific features like anchors (&) and aliases (*), multi-document streams (---), and binary data (!!binary) don't have direct JSON equivalents. Standard YAML data types (strings, numbers, booleans, arrays, objects) convert accurately.

Is my YAML/JSON data sent to a server?

No. js-yaml converts your data entirely within your browser. Your configuration files and data never leave your device.

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