YAML to JSON Converter

Convert YAML to JSON

YAML is often used for configuration files because people can read its indentation and labels without much visual clutter. JSON is common when structured data must be passed between applications, stored in a data file, or inspected with tools that expect braces, brackets, and quoted property names. This converter turns YAML data into formatted JSON so you can move the same information into a JSON-based workflow without rewriting every value by hand.

How to use the converter

1. Paste your YAML into the source box, or select a local .yaml or .yml file.
2. Choose two-space or four-space indentation for the output. This changes how the JSON is laid out for reading; it does not change the underlying data.
3. Select Convert to JSON. Read the status message and inspect the result before copying it or downloading converted.json.

The editor accepts YAML text as well as a local text file. Loading a file fills the input area; it does not automatically convert it. If you change the source after a conversion, run the conversion again so the output reflects your latest edits. Use Clear when you want to remove both the input and previous result.

What is carried into JSON?

YAML mappings become JSON objects, and YAML sequences become JSON arrays. Nested mappings and lists remain nested, while strings, numbers, Boolean values, and null values are represented using JSON's corresponding value types where the parser can resolve them. The output is formatted with the indentation option you selected, making it easier to review and compare.

Comments and YAML-specific presentation are not carried over as comments in JSON. JSON does not support comments, anchors as a separate visible feature, or every YAML-specific type in the same way. Treat the result as converted data, not a copy of the original source formatting. If your file relies on advanced YAML features, review the output and confirm that the receiving application interprets the resulting values as intended.

Common YAML errors

Indentation is significant in YAML. A child property that is indented incorrectly may be treated as a separate item or may cause a parsing error. Keep sibling properties aligned, use consistent spacing, and check that each list item begins at the correct level. Colons and special characters inside plain text can also be interpreted as YAML syntax; quote a value when its meaning is unclear. Make sure quotation marks are paired and that brackets are closed.

If conversion fails, the status area displays the parser's error message when available. Use the reported line or position as a starting point, correct the source, and try again. Avoid fixing only the output: invalid source should be corrected so future conversions remain reproducible.

Review the result before using it

Dates and date-like strings deserve attention because YAML parsers may interpret some unquoted values as typed data rather than ordinary text. If another application expects a specific string format, quote date values in the YAML source and test the converted JSON. Also inspect multiline text, empty values, and numbers that look like identifiers. A postal code or account code may need to remain a string even if it contains only digits.

Finally, check that the generated JSON represents the same hierarchy as the original YAML and that any required keys are present. The converter does not know the rules of your target application, so successful parsing is not proof that the destination will accept every field. This tool runs in your browser; your pasted text and selected file are processed locally rather than uploaded to DataFrog.