🔁 JSON ↔ YAML Converter

Bidirectional JSON-YAML conversion. Edit configs, migrate APIs, convert between formats instantly.

JSON Input

YAML Output

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📋 When to Use the JSON ↔ YAML Converter

The JSON ↔ YAML Converter is ideal when you need to convert between these two popular data serialization formats — whether you're migrating API responses from JSON to YAML config files, converting Kubernetes manifests, or preparing CI/CD pipeline definitions. Use it when working with DevOps tools that prefer YAML, or when you need human-readable configs from machine-generated JSON. Everything processes in your browser for maximum privacy.

⚙️ How the JSON ↔ YAML Converter Works

The JSON ↔ YAML Converter uses the js-yaml library, the most popular YAML parser for JavaScript. When you paste JSON and click Convert, js-yaml.dump() serializes the JavaScript object to YAML. When you paste YAML and click Convert, js-yaml.load() parses it and JSON.stringify() formats the output. All processing runs entirely in your browser — your data never leaves your device. The entire pipeline from input to output stays on your device.

How to Use the JSON ↔ YAML Converter

Choose direction — Click "JSON → YAML" or "YAML → JSON" tab. Each has its own input/output panel with pre-loaded sample data.
Paste your data — Drop JSON on the JSON tab or YAML on the YAML tab. The sample data is pre-loaded so you can test before committing your own.
Click Convert — Your data is transformed instantly. JSON objects become YAML key-value pairs. Arrays become YAML sequences with dashes.
Copy results — Use the Copy button to grab the output. Switch tabs to convert back and verify round-trip fidelity of your data.

Frequently Asked Questions

Is the conversion lossless?

Yes, for most common data types. JSON types (string, number, boolean, null, array, object) map cleanly to YAML equivalents. Round-trip conversion (JSON → YAML → JSON) preserves data integrity. Edge cases like YAML-specific features (anchors, aliases, tags) are preserved when going YAML → JSON → YAML.

What YAML version is supported?

The js-yaml library supports YAML 1.2 specification. This includes anchors, aliases, multi-line strings, folded strings, and complex nested structures. Most common YAML features used in Docker Compose, Kubernetes, and CI/CD configs work out of the box.

Can I use this for Kubernetes/Docker Compose files?

Absolutely! The converter handles complex YAML structures including nested mappings, sequences, and multi-line strings — perfect for Kubernetes manifests, Docker Compose files, Ansible playbooks, and GitHub Actions workflows.

Why does my YAML output have different formatting from the input?

YAML supports multiple equivalent representations (e.g., flow style vs block style). The converter uses the most readable block-style YAML by default. The data is preserved; only the formatting style may differ, which is normal for all YAML processors.