A YAML to JSON converter translates human-readable YAML configuration files into the JSON format that APIs and JavaScript applications expect. YAML powers Docker Compose, Kubernetes, GitHub Actions, and hundreds of other DevOps tools. This free converter handles both directions — YAML to JSON and JSON back to YAML — entirely in your browser.
YAML Input
JSON Output
Output will appear here...
How to Use the YAML to JSON Converter
YAML and JSON represent the same data structures with different syntax. YAML favors human readability with indentation-based structure and minimal punctuation. JSON uses braces and brackets familiar to every JavaScript developer. Our free YAML to JSON converter translates between them instantly.
Step 1: Choose the Direction
Click "YAML → JSON" to convert a YAML file to JSON, or "JSON → YAML" to go the other way. The input placeholder updates to show example syntax for the selected input format.
Step 2: Paste Your YAML or JSON
Copy your YAML configuration — from a Kubernetes manifest, Docker Compose file, GitHub Actions workflow, or any other source — and paste it into the input area. For JSON to YAML conversion, paste any valid JSON object or array.
Step 3: Convert and Review
Click Convert or the conversion runs automatically as you type. The output appears with proper formatting. If your YAML has syntax errors — incorrect indentation, invalid characters, or unclosed strings — an error message identifies the problem so you can fix it.
Step 4: Copy the Result
Use the Copy button to place the converted output on your clipboard. This is ready to paste directly into your codebase, API client, or documentation.
YAML Syntax Quick Reference
YAML uses indentation (2 spaces recommended) for nested objects. Arrays use a dash prefix (- item). Strings generally do not need quotes unless they contain special characters. Boolean values are true or false (lowercase). Null is represented by null or a tilde (~).
Frequently Asked Questions
Is the YAML to JSON converter free?
Yes, completely free with no usage limits and no account required. All conversion happens in your browser — your data never leaves your device.
Is my YAML or JSON data private?
Yes. The converter runs entirely in client-side JavaScript. Nothing is uploaded or stored on any server, making it safe for configuration files with sensitive values like API keys and credentials.
What YAML features does the parser support?
The parser supports key-value pairs, nested objects (indented blocks), sequences (arrays with - prefix), scalar types (strings, numbers, booleans, null), single-quoted and double-quoted strings, and multiline literals (| and > block scalars). Advanced YAML features like anchors and aliases are not supported.
Can I convert JSON back to YAML?
Yes! Use the JSON → YAML direction tab. The converter produces clean, readable YAML from any valid JSON input, preserving the structure and data types.
Why do some numbers or booleans convert differently than expected?
YAML treats bare values like 'true', 'false', 'null', and numeric strings as their typed equivalents. If you need a value to stay as a string, wrap it in quotes in your YAML: 'true' becomes the string 'true' rather than the boolean true.
What is YAML used for?
YAML (YAML Ain't Markup Language) is widely used for configuration files in DevOps and software projects — Docker Compose files, Kubernetes manifests, GitHub Actions workflows, Ansible playbooks, and many other tools use YAML because it is human-readable and supports complex nested structures.