Tools JSON
JSON, YAML & CSV Converter
Convert JSON to YAML or CSV, and YAML or CSV back to JSON.
🔒 Runs in your browser. Nothing is uploaded.How to use it
- Choose a conversion, such as JSON → YAML or CSV → JSON.
- Paste your data on the left. The result updates as you type.
- For CSV, pick the delimiter: comma, semicolon (common in European Excel) or tab.
- Copy the result or download it as a file.
Questions
What JSON can be turned into CSV?
An array of objects or an array of arrays. Each object becomes a row, and every key that appears in any object becomes a column. Nested objects and arrays are written into the cell as JSON.
Does CSV → JSON turn numbers into numbers?
With "Convert numbers and true/false" on, yes, but only when the value would print back exactly the same. So 42 becomes a number, while 007 and 1.50 stay strings, because converting them would lose the leading zero or trailing zero.
Which YAML is supported?
YAML 1.2, including anchors, multi-line strings and comments. Comments are dropped when converting to JSON, because JSON has none. A file with several documents separated by --- is not supported; convert one document at a time.
Is my data uploaded?
No. Conversion happens in your browser, and the page’s security policy blocks it from sending your data anywhere.