Free browser tool

JSON ↔ YAML converter

Convert between JSON and YAML and check syntax errors.

Input and settings

How to use

JSON ↔ YAML converter processes your input in the browser, then lets you inspect or download the result.

  1. Choose or paste the input.
  2. Adjust only the options you need.
  3. Run the tool and inspect or download the result.
Input
Code, URLs, structured data, or settings used by this tool
Processing
In-browser

Before using the result

Generated or analyzed results can depend on the target specification or runtime. Verify important uses against the relevant specification.

JSON and YAML overlap, but they are not identical twins

Both can represent structured data, which makes conversion useful for APIs and config files. But YAML can carry things that do not round-trip neatly through JSON, such as comments and some type interpretations.

A successful conversion can still lose context

If a YAML file contains comments, converting it to JSON and back may not restore them. Values that look like dates or booleans can also be interpreted differently depending on the parser.

Treat important config like code

  • Keep the original file.
  • Review key names and value types after conversion.
  • For production config, compare the before/after structure instead of trusting appearance alone.

Typical use

Convert a YAML configuration to JSON for an API, then verify that the keys and values still mean the same thing before you deploy it.