Why convert YAML to JSON?

JSON is the native format for JavaScript and web APIs. Converting YAML configs to JSON enables use with tools that only accept JSON, easier programmatic manipulation, and integration with REST APIs.

Is YAML to JSON conversion lossless?

Yes, all data values and structures are preserved. However, YAML comments are lost during conversion since JSON doesnt support comments, and YAML anchors/aliases are resolved to their actual values.

YAML to JSON Converter Online - Free YAML to JSON Tool

YAML to JSON Converter

Convert YAML configuration files to JSON format. Perfect for API integration, JavaScript processing, and tools that require JSON.

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Paste your YAML here to convert to JSON...

OutputEMPTY

Formatted output will appear here...

How to Convert YAML to JSON

Paste Your YAML

Copy your YAML configuration and paste it into the input editor.

Click Convert → JSON

Use the Convert dropdown and select "to JSON" to transform your data.

Copy JSON Output

Copy the JSON result or download it as a .json file.

YAML to JSON Conversion Example

YAML Input

name: my-app
version: 1.0.0
database:
  host: localhost
  port: 5432
  name: mydb
features:
  - authentication
  - logging
  - caching

JSON Output

{
  "name": "my-app",
  "version": "1.0.0",
  "database": {
    "host": "localhost",
    "port": 5432,
    "name": "mydb"
  },
  "features": [
    "authentication",
    "logging",
    "caching"
  ]
}

Common Use Cases

API Integration

Convert YAML configs to JSON for REST API requests that only accept JSON payloads.

JavaScript Processing

JSON can be directly parsed with JSON.parse() without additional YAML libraries.

Tool Compatibility

Some tools (Postman, certain APIs) only accept JSON. Convert your YAML configs for compatibility.

Data Migration

Migrate configuration from YAML-based systems to JSON-based systems or databases.

Understanding YAML to JSON Conversion

Lossless Data Conversion

All YAML data values and structures are preserved during conversion. Objects, arrays, strings, numbers, booleans, and null values are mapped directly to their JSON equivalents. The hierarchical structure remains intact.

Comments Are Lost

YAML supports comments with #, but JSON doesn't support comments. During conversion, all comments are removed. If you need to preserve comments, keep the original YAML file or use JSONC (JSON with Comments).

Anchors & Aliases Resolved

YAML anchors (&) and aliases (*) are powerful features for referencing repeated content. During conversion, these are resolved to their actual values since JSON doesn't support references.

Type Preservation

YAML's automatic type detection is preserved: numbers stay numbers, booleans stay booleans, and quoted strings remain strings. Dates are converted to ISO format strings since JSON doesn't have a native date type.

Frequently Asked Questions

What YAML features are lost in conversion?

Comments (# lines) are removed since JSON doesn't support them. Anchors (&) and aliases (*) are resolved to their actual values. Multi-document YAML (--- separators) converts the first document only. All data values are fully preserved.

How are YAML booleans converted?

YAML accepts various boolean forms (true, True, TRUE, yes, Yes, on, On) which are all normalized to JSON's true/false. Similarly, no, No, off, Off become false. This ensures consistent JSON output.

Can I convert JSON back to YAML?

Yes! Use our JSON to YAML converter to transform JSON back to YAML format. The conversion is lossless for data, though you'll need to manually add comments if needed.

How are multi-line strings handled?

YAML literal (|) and folded (>) multi-line strings are converted to regular JSON strings with \n for newlines. The content is fully preserved, just represented in JSON's escape syntax.