How do I convert YAML to JSON?

Paste your YAML content into the input box and click Convert. The tool parses all YAML syntax including nested maps, sequences, and multi-line strings, and outputs valid JSON.

Does this tool support YAML anchors and aliases?

The tool supports standard YAML structures. For complex anchor/alias resolution, the YAML is parsed using a standards-compliant parser that handles most real-world YAML files.

Is my YAML data safe?

Yes. All parsing happens 100% in your browser. No data is uploaded to any server.

YAML to JSON Converter Online — Free & Client-Side

YAML Input

Indent:

JSON Output

How to Convert YAML to JSON Online

YAML (YAML Ain't Markup Language) and JSON (JavaScript Object Notation) are the two most popular data serialization formats in modern software development. Converting YAML to JSON is an essential task for developers building API endpoints, configuring servers, or moving data between systems. With this free utility, you can convert complex configuration files instantly.

Step-by-Step YAML to JSON Conversion

Paste your YAML: Copy your configuration, properties, or data structure and paste it into the "YAML Input" text area.
Configure Indentation: Choose whether you want the generated JSON to be minified (0 spaces) or formatted with 2 or 4 spaces using the Indent dropdown.
Execute Conversion: Click the blue "Convert to JSON" button to trigger the parser.
Copy or Download: Instantly copy the output to your clipboard or download the converted data as a .json file.

YAML vs JSON: Key Syntax Differences

While both formats represent hierarchical data models, their syntax rules and target applications vary significantly. Here is a quick comparison table:

Feature	YAML Syntax	JSON Syntax
Readability	Very high (designed for humans, minimal syntax symbols)	Moderate (uses brackets, braces, and quotes)
Whitespace	Indent-sensitive (spaces define hierarchy)	Ignored (whitespace and newlines have no structural meaning)
Comments	Supported natively using the `#` character	Unsupported (requires non-standard extension keys)
Data Types	Implicit type detection (quotes are optional for strings)	Explicit types (strings must be enclosed in double quotes)
Complexity	Supports advanced features like anchors and block scalars	Simple, straightforward nested objects and arrays

Frequently Asked Questions

What is the difference between YAML and JSON?

YAML is designed to be highly readable and is widely used for configuration files (like Kubernetes, Docker Compose, or GitHub Actions). JSON is a stricter, bracket-based format designed primarily for data transmission between servers and client web applications. JSON is natively supported by almost all programming environments.

Does this YAML converter support anchors and aliases?

Yes. Because our tool integrates the standard js-yaml library, it fully supports advanced YAML features like anchors (&) and aliases (*) to deduplicate references, multi-document files separated by ---, and complex block scalars.

Are comments preserved during YAML to JSON conversion?

No, comments are stripped out. The JSON standard does not natively support comments, so any lines beginning with # in your YAML input will not appear in the resulting JSON output.

Is my configuration data secure?

Absolutely. All parsing and conversion is processed directly inside your web browser using client-side JavaScript. None of your inputs, keys, or passwords are uploaded to a remote server. You can verify this by checking your browser's network tab or running the tool offline.

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🔒 100% Client-Side Privacy

All YAML parsing and JSON generation happens entirely in your browser. No data is ever uploaded to any server.