YAML ↔ JSON Converter
Input (YAML or JSON)
Paste YAML or JSON then choose conversion
Output 
Output appears here…

YAML to JSON Converter Online Free — YAML Formatter & Validator — Free Online Tool

Convert YAML to JSON and JSON to YAML online free. Validates syntax, formats output with syntax highlighting. No upload required — all processing in your browser.

Free Forever
No Signup
No Upload
100% Private
Browser-based

Features

Built for real developer workflows. No fluff, just the tools you need.

⇄

Bidirectional

Convert YAML to JSON or JSON to YAML with one click. Output is correctly formatted and ready to use.

✓

Syntax Validation

Both inputs are validated before conversion. Clear error messages identify what needs fixing.

🎨

JSON Syntax Highlighting

JSON output is colour-coded for instant readability.

⚡

Instant Results

Conversion runs in JavaScript with no server contact.

📋

Copy Output

One-click copy of the converted result.

🔒

Private

Your YAML and JSON never leave your device.

How to use

Get results in seconds — no account, no file upload required.

1

Paste YAML or JSON

Paste your input into the left panel.

2

Choose direction

Click YAML → JSON or JSON → YAML.

3

Copy the result

Click Copy to use the output in your project.

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Frequently asked questions

What YAML features are supported?
▾
Key-value pairs, nested objects, arrays, strings, numbers, booleans and null. Anchors, aliases and multi-line scalars are not yet supported.
Is the JSON output strictly valid?
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Yes — double-quoted strings, no trailing commas, no comments. Valid for all JSON parsers and REST APIs.
Can I convert Kubernetes YAML?
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Basic Kubernetes YAML converts correctly. Complex YAML with anchors (& and *) may not convert as expected.
Why does YAML conversion fail?
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YAML is whitespace-sensitive. Incorrect indentation is the most common cause of parse errors.
Can I convert JSON Schema to YAML?
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Yes — JSON Schema is standard JSON and converts cleanly to YAML, compatible with OpenAPI 3.0.
Does it handle YAML arrays?
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Top-level key-value arrays like - item convert correctly. Inline arrays like [1, 2, 3] also work.