YAML ↔ JSON Converter
Convert configuration and API data between YAML and JSON with automatic format detection.
Input
YAML or JSON detected automatically
JSON Output
Validated and formatted result
{
"app": {
"name": "SmartToolsNest",
"environment": "production"
},
"features": [
"formatter",
"validator"
],
"active": true
}YAML converted to JSON.
How to Use
Paste YAML or JSON, use auto detection or select a direction, choose indentation, then copy, swap, or download the result.
Technical Specs
- Parser
- Symfony YAML
- Input Limit
- 2 MB
- JSON Depth
- 512 levels
- Safety
- No object deserialization
Related Tools
Configuration formats without manual rewriting
YAML is concise for human-edited configuration, while JSON is widely used by APIs and tooling. Conversion preserves structured mappings, lists, booleans, numbers, nulls, and multiline text.
Frequently Asked Questions
How does auto detection work?+
Input beginning with { or [ is treated as JSON; other structured input is parsed as YAML.
Are YAML comments converted?+
No. JSON has no comment representation, so YAML comments cannot survive a structural conversion.
Are anchors and aliases supported?+
Standard YAML parsing handles aliases, while unsafe object deserialization remains disabled.
Why do quoted values sometimes change?+
The converter preserves data types rather than the original textual styling.
Related Articles
Developer newsletter
Stay ahead with new tools
Get practical developer guides, new tools, and workflow improvements without inbox noise.