YAML to JSON

JSON (JavaScript Object Notation) is the data format of the web: compact, unambiguous and understood by virtually every programming language and API. If you want to process a YAML configuration in a program, script or API, you usually need JSON - this tool does the conversion for you.

This tool reads your YAML entirely locally in your browser (js-yaml, pure JavaScript) and outputs cleanly indented JSON (2 spaces). Invalid YAML is rejected with a clear error. The conversion is structure-preserving - objects, lists and values stay identical. Nothing is uploaded.

The most common occasion: a hand-maintained settings file from a project needs to be read by a script, a browser tool or a web service that only accepts the compact web format. Since indentation is meaning-bearing in the source format, the tool surfaces typical pitfalls such as accidental tabs or misaligned lines right away - so you spot typos before they cause damage further down.

Specifications

In 3 steps

1. Drop or pick your YAML file.
2. The tool converts to JSON locally.
3. Download the JSON file.

Limitations: The YAML must be valid (otherwise a clear error). YAML comments are lost (JSON has none). Numbers and booleans stay real JSON types (number/boolean); YAML timestamps become ISO 8601 text strings, since JSON has no date format. Multiple YAML documents in one file (---) are read up to the first one. Very large files need memory.

FAQ

Related tools

JSON to YAML · XML to JSON · YAML to XML · TOML to JSON · JSON to TOML · YAML to TOML