Why did my YAML fail to parse?

Common causes: tabs for indentation, inconsistent spacing, or unquoted special characters.

Are multi-document YAML files supported?

Multiple documents may require splitting; single-document conversion is most reliable.

Will numbers stay numbers in JSON?

YAML types map to JSON numbers, strings, booleans, arrays, and objects appropriately.

YAML JSON Converter

Convert YAML to JSON or JSON to YAML. See clear syntax errors and copy or download the formatted result.

Files and content are processed locally in your browser and are not uploaded to our server.

About this tool

Paste YAML or JSON and convert it into the other format. Invalid indentation, tab characters, and other syntax errors are identified before the result is produced.

How to use

Convert YAML to JSON
Convert JSON to YAML
Show syntax errors with line information
Produce readable two-space indentation
Copy or download the result
Paste source: Input YAML or JSON depending on direction.
Convert: Click Convert to transform formats.
Review output: Fix parse errors if shown, then copy or download.

Examples

Convert an application configuration between YAML and JSON
Inspect a YAML file as a JSON structure
Prepare data for a system that accepts only one format
Convert a GitHub Actions configuration for inspection

Limitations

YAML anchors and aliases may expand when converted to JSON because JSON has no equivalent reference syntax
JSON does not support YAML comments—comments are lost converting to JSON
The entered data is processed directly in your browser and is not sent to a server.

FAQ

Why did my YAML fail to parse?: Common causes: tabs for indentation, inconsistent spacing, or unquoted special characters.
Are multi-document YAML files supported?: Multiple documents may require splitting; single-document conversion is most reliable.
Will numbers stay numbers in JSON?: YAML types map to JSON numbers, strings, booleans, arrays, and objects appropriately.