What is YAML to JSON Converter?
YAML (YAML Ain't Markup Language) and JSON (JavaScript Object Notation) are two widely used data serialization formats that represent the same underlying data structures in different syntax. YAML uses indentation-based formatting that is easy for humans to read and write, making it popular for configuration files. JSON uses braces and brackets with explicit quoting, making it the standard for APIs, data interchange, and programmatic consumption. This converter transforms data between both formats instantly, preserving structure and values.
How to Use This Tool
Paste your YAML or JSON content into the input area. Click "YAML to JSON" to convert YAML configuration into a properly formatted JSON object with 2-space indentation. Click "JSON to YAML" to transform JSON data into clean YAML with proper indentation and no line wrapping. The converter uses the JSON_SCHEMA setting for safe YAML parsing, preventing the execution of custom YAML tags. Copy the result with one click, or press "Clear" to reset the tool.
Common Use Cases
- Converting Kubernetes manifests and Docker Compose files from YAML to JSON for programmatic manipulation
- Transforming JSON API responses into YAML for use in configuration files or documentation
- Migrating CI/CD pipeline configurations between platforms that prefer different formats
- Validating YAML syntax by converting to JSON, which has stricter parsing rules
Why Use a Client-Side YAML/JSON Converter?
Configuration files frequently contain sensitive information like infrastructure details, service endpoints, environment-specific settings, and deployment configurations. Pasting these into an online converter that sends data to a server exposes your infrastructure architecture to third parties. This tool runs entirely in your browser. Your YAML and JSON content stays on your device with no data transmitted over the network, making it safe for DevOps workflows, infrastructure-as-code files, and proprietary configuration data.
Frequently Asked Questions
Does the converter preserve comments when converting YAML to JSON?
No. JSON does not support comments as part of its specification, so any comments in your YAML file are lost during conversion to JSON. If you convert the JSON back to YAML, the comments will not be restored. This is a fundamental limitation of the JSON format. If preserving comments is important, keep a copy of your original YAML file alongside the converted JSON output.
Can this tool handle multi-document YAML files?
This tool processes single YAML documents. If your file contains multiple documents separated by the --- delimiter, only the first document will be converted. For multi-document YAML files, split them into individual documents and convert each one separately. Most configuration use cases (Docker Compose, application config, CI/CD pipelines) use single-document YAML, so this covers the vast majority of real-world scenarios.
Why does the converter use JSON_SCHEMA for YAML parsing?
The JSON_SCHEMA setting restricts YAML parsing to only recognize data types that have direct JSON equivalents: strings, numbers, booleans, null, arrays, and objects. This prevents potentially unsafe custom YAML tags and type coercion that could produce unexpected results. For example, without this restriction, YAML might interpret "yes" as a boolean true or "1.0" as a number. JSON_SCHEMA mode gives you predictable, safe conversions every time.