YAML to JSON Converter
Paste YAML on the left, get pretty-printed JSON on the right. Everything runs in your browser — nothing is uploaded to any server. Supports nested maps, lists, scalars, comments and quoted strings.
Your converted JSON will appear here.How to use
- Paste or type your YAML into the input box on the left.
- Press Convert to JSON to get pretty-printed JSON with syntax highlighting.
- If the parser finds a problem, it shows the exact line number so you can fix it fast.
- Use Copy JSON or Download .json to take the result with you.
Supported YAML features
- Nested maps (objects) with space indentation.
- Lists, including lists of maps.
- Scalars: strings, integers, decimals, booleans (
true/false,yes/no,on/off) and null (null,~, or empty). - Comments starting with
#(ignored outside quoted strings). - Single- and double-quoted strings, with escape sequences in double quotes.
Frequently asked questions
No. The YAML parsing and JSON formatting all happen in your browser with JavaScript. Your text never leaves your device.
The tool shows a red error box with the exact line number and a short description of the problem, such as bad indentation or a missing colon, so you can fix it quickly.
Nested maps, lists (including lists of maps), strings, numbers, booleans, null values, comments and quoted strings. It uses indentation with spaces, not tabs, for nesting.
Yes. After converting, press Download .json to save the pretty-printed JSON as a file, or use Copy JSON to paste it anywhere.