JSON ↔ YAML Converter
Convert between JSON and YAML formats instantly. Syntax validation included. No server required.
How to Use
- Use the tab switcher to select direction: JSON to YAML or YAML to JSON. Paste your source data into the input panel on the left.
- The conversion runs automatically as you type. Any syntax errors are shown inline so you can fix them immediately before copying.
- Copy the output with one click. Note: YAML comments are lost when converting to JSON, and YAML anchors are fully expanded into their referenced values.
Frequently Asked Questions
- What data types are preserved during conversion?
- Strings, numbers, booleans, nulls, arrays, and nested objects are all preserved. YAML has richer type support (timestamps, binary), but those types are represented as strings in JSON output.
- Are YAML comments and anchors preserved when converting to JSON?
- No — JSON has no comment syntax, so all YAML comments are discarded. YAML anchors and aliases are expanded into their full values in the JSON output.
- Is there a size limit?
- No hard limit. Very large inputs may slow your browser.