How are YAML comments handled?

Comments (# lines) are discarded during conversion since JSON doesn't support comments. If you need to preserve comments, consider using JSON5 or JSONC format instead, or store comments as data fields.

What about YAML anchors and aliases?

Anchors (&name) and aliases (*name) are fully resolved - the referenced data is duplicated in the JSON output. This increases file size but ensures the JSON is self-contained.

Can I convert multi-document YAML?

YAML files with multiple documents (separated by ---) typically convert to a JSON array, with each document as an array element. Some converters only process the first document.

YAML to JSON Converter

Guide & TutorialOffline

Convert YAML data to JSON format

Convert YAML to JSON format instantly with our free online YAML to JSON converter. This tool helps developers transform YAML configuration files into JSON format for APIs and data processing. Simply paste your YAML and get JSON output in real-time.

Pretty print JSON output

Input YAML

0 characters, 1 lines

JSON Output

About YAML to JSON Conversion

Convert YAML (YAML Ain't Markup Language) to JSON (JavaScript Object Notation). This is useful when you need to use YAML configuration files in environments that only support JSON, or when you need to process YAML data programmatically.

About YAML to JSON Converter

YAML to JSON conversion transforms human-readable YAML configuration files into JSON format for use with APIs, JavaScript applications, and systems that require JSON. YAML's cleaner syntax with indentation-based structure converts to JSON's bracket-based format while preserving all data.

How It Works

The converter parses YAML syntax (indentation, colons, dashes) into a data structure, then serializes it as JSON. YAML features like anchors (&), aliases (*), and multi-line strings are resolved during parsing. The output is valid JSON with proper quoting and structure.

Technical Details

YAML is a superset of JSON - valid JSON is valid YAML. YAML adds: indentation-based nesting, unquoted strings, comments (#), multi-line strings (| and >), anchors/aliases for reuse, and multiple documents (---). These features are resolved to JSON equivalents during conversion.

Common Use Cases

API Integration

Convert YAML config files to JSON for REST API consumption.

Convert docker-compose.yml data to JSON for API calls

JavaScript Applications

Transform YAML configs for use in Node.js or browser apps.

CI/CD Pipeline Data

Extract data from YAML pipeline configs for processing.

Configuration Migration

Convert YAML-based configs to JSON-based systems.

Code Examples

Node.js with js-yaml

javascript

const yaml = require('js-yaml');

const yamlString = `
name: John Doe
age: 30
skills:
  - JavaScript
  - Python
`;

const jsonObject = yaml.load(yamlString);
const jsonString = JSON.stringify(jsonObject, null, 2);
// {"name":"John Doe","age":30,"skills":["JavaScript","Python"]}

js-yaml is the most popular YAML parser for JavaScript. yaml.load() parses YAML to object.

Python with PyYAML

python

import yaml
import json

yaml_string = """
name: John Doe
age: 30
skills:
  - JavaScript
  - Python
"""

data = yaml.safe_load(yaml_string)
json_string = json.dumps(data, indent=2)

Always use safe_load() instead of load() to prevent arbitrary code execution from malicious YAML.

Tips & Best Practices

Use safe parsing methods to prevent code injection from untrusted YAML
Validate the output JSON structure matches your schema expectations
Remember that YAML comments will be lost in conversion
For large files, consider streaming parsers to reduce memory usage
Test with edge cases: empty values, special characters, nested structures

Common Mistakes to Avoid

Using unsafe YAML loaders that can execute arbitrary code
Expecting JSON to preserve YAML comments
Not handling YAML parsing errors gracefully
Forgetting that YAML is indentation-sensitive

When to Use This Tool

Use YAML to JSON when you need to consume YAML configuration in JSON-only systems, integrate with REST APIs, or process YAML data in JavaScript applications.

Frequently Asked Questions

Data values are preserved, but YAML-specific features are resolved: comments are removed (JSON doesn't support them), anchors/aliases are expanded, and multi-line strings become regular strings. The data content remains identical.

const yaml = require('js-yaml'); const yamlString = ` name: John Doe age: 30 skills: - JavaScript - Python `; const jsonObject = yaml.load(yamlString); const jsonString = JSON.stringify(jsonObject, null, 2); // {"name":"John Doe","age":30,"skills":["JavaScript","Python"]}