Convert YAML to JSON and vice versa
Convert between YAML and JSON formats with validation
Supports YAML, YML, JSON, and TXT files
Yes. Radio buttons switch between YAML to JSON and JSON to YAML, uploading a file auto-selects the direction from its extension, and the Swap button moves your output back into the input while flipping the mode.
For JSON output you can choose 2-space, 4-space, or tab indentation, or a minified single line, plus optional alphabetical key sorting. For YAML output you pick the indent, a quote-all option for string values, and compact flow style for arrays and objects.
The status line under the input reports Invalid YAML or Invalid JSON with the parser message from the underlying library, so a bad indent or missing bracket points you at the cause. Valid input shows a green Valid status.
An option that makes the YAML parser reject constructs it would otherwise tolerate, useful when you want to enforce conservative YAML that parses identically in every application.
No. Parsing uses a locally bundled YAML library and the native JSON parser in your browser; pasted or uploaded files are converted in the page and never leave your device.