Dev Patrache

JSON to YAML Converter
Last updated: 2026 · Free online tool

What is JSON to YAML Converter?

Free online tool to convert between JSON and YAML in both directions, auto-detecting the input format and preserving indentation and nested structure.

How to Use

  1. 1
    Select Direction— Choose JSON to YAML or YAML to JSON, or use auto-detection.
  2. 2
    Enter Data— Paste the JSON or YAML data to convert into the left input panel.
  3. 3
    Convert— Click the 'Convert' button to display the result on the right.
  4. 4
    Copy Result— Use the copy button to copy the result. You can also use the swap button for reverse conversion.

Related Tools

JSON Formatter & ViewerFree online JSON formatter and viewer that beautifies minified or single-line JSON with proper indentation, lets you explore the structure in a collapsible tree view, and flags syntax errors
JSON DiffFree online JSON diff tool that compares two JSON objects side by side, color-highlighting added, deleted, and changed keys while deeply traversing nested structures so every difference stands out
JSON to CSV ConverterFree online tool to convert a JSON array into tabular CSV or turn CSV back into JSON, with bidirectional conversion that flattens nested objects and lets you download a CSV file

Frequently Asked Questions

Yes, if the input starts with { or [, it is detected as JSON; otherwise it is detected as YAML. You can also manually specify the direction.

Yes, since js-yaml library is used, basic anchors/aliases are supported. However, references are resolved in the output.

Currently only single YAML documents are supported. For multi-document YAML, only the first document is converted.

JSON has no comment concept, and YAML comments are removed during parsing. Keep a backup of the original if comments need to be preserved.

Date formats in YAML (2026-01-01) are parsed as Date objects by js-yaml. They are output as ISO 8601 strings in JSON.

This site uses cookies for better experience and advertising. Learn more