JSON to YAML Converter

JSON to YAML Converter turns any valid JSON object into clean, readable YAML in one click. Paste a JSON configuration fragment, an API response, or an object literal — the converter validates the JSON first and shows the exact position of any parse error before attempting conversion.

The output uses 2-space indentation and the js-yaml library (MIT license, version 4.1.0), which produces standards-compliant YAML. Objects become key: value pairs at the correct indent level. Arrays become block sequences with dash markers. Strings that would be misinterpreted as YAML scalars — values that look like numbers, booleans, or null — are automatically quoted. Long strings and URLs are never line-wrapped, so the output is safe for Kubernetes manifests, Docker Compose files, and GitHub Actions workflows that use multi-line string values or URLs as YAML values.

Common use case: you have a JSON API response or a JavaScript configuration object and need a YAML representation for infrastructure tooling. Copy the JSON from your editor or terminal, paste it here, click Convert, and copy the YAML output. No server is involved — parsing runs locally using your browser's native JSON.parse(), and serialisation runs with jsyaml.dump(). Nothing is transmitted or logged.

The tool handles the full JSON type system: nested objects, arrays, strings (including Unicode), numbers, booleans, and null. YAML null is rendered as an empty value or ~ depending on context. Numbers and booleans round-trip correctly. The only limitation is that js-yaml produces block-style YAML — if you need flow style or a specific YAML version header, those options are not available in this converter.