YAML to JSON Converter

Switch between YAML and JSON in one click

YAML is popular for configuration files such as Docker Compose, GitHub Actions, OpenAPI and Kubernetes manifests. JSON is what most code and APIs consume. This converter translates in both directions and tells you when something is wrong.

YAML to JSON

Paste YAML on the left. The JSON appears on the right, formatted with your choice of two or four space indentation. If the file contains several documents separated by three dashes, you get a JSON array with one element per document. Syntax problems are reported with a line and column so you can fix them quickly.

JSON to YAML

Paste JSON and the YAML appears with proper indentation. Turn on Sort keys to get alphabetical order, which helps when comparing two configs or keeping a file tidy in version control. Long lines are not wrapped, so values such as URLs remain on one line.

Common YAML traps

1. Indentation uses spaces, never tabs. A tab is the most frequent cause of a parse error.
2. Quote ambiguous values. Text like 1.10, 010, on or null may be read as a number or special value; quote it to keep it as a string.
3. Colons in text. A value that contains a colon followed by a space needs quotes.
4. Anchors and aliases (&name and *name) are expanded in the JSON output because JSON has no way to reference earlier values.
5. Comments are lost. Keep your original YAML if the notes matter.

Using the output

Copy the result or download it as data.json or data.yaml. For Kubernetes or Compose, validate the converted structure with the tool that will read it, because this converter checks syntax, not the schema of any particular product.

Privacy

Nothing is uploaded. The YAML library runs inside your browser tab, so secrets in config files stay on your machine.