JSON to YAML Converter
Simple object
Nested config
Convert JSON to YAML and YAML to JSON instantly. Supports nested objects, arrays, and all data types. Clean, readable output.
How to Use JSON to YAML Converter
- Select the conversion direction: JSON to YAML or YAML to JSON.
- Paste or type your data in the input area.
- The converted result appears instantly in the output area.
- Click "Copy" to copy the result to your clipboard.
What is JSON to YAML Conversion?
This tool converts data between JSON and YAML formats. JSON is a lightweight data-interchange format widely used in web APIs, while YAML is a human-friendly data serialization language popular for configuration files in tools like Docker, Kubernetes, and GitHub Actions.
Both formats represent the same data structures — objects, arrays, strings, numbers, and booleans — but with different syntax. This converter lets you quickly switch between them without manual rewriting.
Key Syntax Differences
JSON uses braces for objects, brackets for arrays, and requires double quotes around all keys and string values. YAML uses indentation for nesting and makes quotes optional for most strings. YAML also supports comments (lines starting with #), which JSON does not. This makes YAML more natural for human-edited config files, while JSON's strictness makes it better for machine-to-machine data exchange.
YAML Gotchas: The Norway Problem
YAML's automatic type inference creates surprising bugs. The country code NO (for Norway) gets interpreted as boolean false. Similarly, on and off become booleans, and 1.0 becomes a float instead of the string "1.0". Version numbers like 3.10 become 3.1. Always quote values that look like booleans or numbers but should be strings. YAML 1.2 fixes some of these, but many parsers still use YAML 1.1 rules.
When Teams Choose YAML Over JSON
Kubernetes manifests, Docker Compose files, GitHub Actions workflows, Ansible playbooks, and CI/CD pipelines all use YAML because it's easier to read and supports comments for documentation. JSON dominates in API responses, package manifests (package.json), and anywhere strict, unambiguous parsing matters. If humans edit the file frequently, YAML usually wins. If machines generate it, JSON is safer.