JSON to YAML Converter
Convert JSON to YAML format instantly. Clean, readable YAML output. Free online JSON to YAML converter.
What is JSON to YAML Converter?
A JSON to YAML converter transforms JSON data into YAML format, which is more readable for configuration files and human editing. YAML uses indentation-based structure without braces, brackets, or quotation marks around most values. This makes it preferred for configuration management (Kubernetes, Docker, CI/CD pipelines) where humans frequently read and edit the files. This tool converts any valid JSON into clean, properly indented YAML that follows best practices for readability.
How It Works
The tool parses your JSON input into a data structure, then serializes it as YAML using proper indentation (2 spaces per level). Objects become indented key-value pairs, arrays use dash (- ) prefix notation, strings that could be misinterpreted as other types are quoted, and multi-line strings are handled appropriately. The output follows YAML 1.2 specification and is compatible with all major YAML parsers and configuration management tools.
Examples
{"app":{"name":"api","replicas":3,"tags":["web","prod"]}}app:
name: api
replicas: 3
tags:
- web
- prodCommon Use Cases
- •Converting API response JSON into YAML format for use in configuration files
- •Creating Kubernetes manifests from JSON data produced by API calls or scripts
- •Preparing human-editable configuration from JSON-based settings or defaults
- •Converting JSON Schema definitions to YAML for OpenAPI specification files
- •Transforming JSON test data into YAML for use in CI/CD pipeline configurations
- •Making JSON data more readable for documentation and sharing with non-developers
Frequently Asked Questions
How is the YAML formatted?▼
Output uses 2-space indentation with no line wrapping for maximum readability.
Is every JSON document valid YAML?▼
Yes for YAML 1.2, which was defined as a superset of JSON, so a JSON file can be parsed by a conforming YAML parser as-is. The reverse does not hold: YAML anchors, comments, multiple documents and unquoted multi-line strings have no JSON equivalent.
Why did my version number become a decimal, and my Y become true?▼
This is the YAML type-guessing problem. Unquoted `1.20` is a number and loses the trailing zero; in the older YAML 1.1 rules that many parsers still follow, `yes`, `no`, `on`, `off`, `y` and `n` are booleans — the well-known "Norway problem", where the country code `NO` becomes `false`. Quote any value that must stay a string.
Should I use tabs or spaces for YAML indentation?▼
Spaces, always. Tabs are forbidden by the specification and are a hard parse error, not a style preference. Two spaces per level is the usual convention, and indentation must be consistent because it is what defines the structure.
How are long strings and line breaks represented?▼
YAML offers block scalars: `|` preserves the newlines in the block, and `>` folds them into spaces. Both are far more readable than a JSON string containing `\n` escapes, which is a large part of why configuration files favour YAML.
Does converting to YAML preserve key order?▼
The output follows the order of the JSON input, and YAML preserves it in the file. Be aware that neither format guarantees order is meaningful to a consumer — most parsers load mappings into an unordered dictionary, so do not rely on ordering for behaviour.
Further Reading
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