Does it support multi-document YAML files?

It converts the first document in a multi-document YAML file (separated by ---). Paste each document separately if you need to convert them individually.

What YAML features are supported?

Full YAML 1.2 support including nested objects, arrays, anchors (&), aliases (*), multi-line strings, and all scalar types.

The output JSON is on one line — can I pretty-print it?

The output is already pretty-printed with 2-space indentation. If it appears as one line, check that you're viewing it in a text editor that renders line breaks.

Is my configuration data safe?

Yes. Everything runs in the browser. No data is sent anywhere.

YAML to JSON Converter Online

YAML to JSON converter online — paste YAML and get clean, formatted JSON instantly. Supports anchors, aliases, multi-line strings. Free.

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Frequently asked questions

Convert YAML to JSON Online — Free YAML to JSON Converter

Paste YAML and get clean JSON instantly. YAML is widely used for configuration files in Docker, Kubernetes, GitHub Actions, and many other developer tools — but some APIs, tools, and languages work exclusively with JSON. This online YAML to JSON converter parses your input — including nested structures, arrays, multi-line strings, anchors (&) and aliases (*) — and outputs properly formatted JSON. Need the reverse direction? Use our JSON to YAML converter.

Full YAML support

Handles nested objects, arrays, multi-line strings, anchors (&), aliases (*), and YAML 1.2 spec features.

Pretty-printed output

JSON output is indented and formatted for readability — not a single line of minified text.

Instant validation

Invalid YAML is caught and a clear error is shown pointing to the problem, so you can fix it before converting.

Convert Kubernetes manifests, Docker Compose files, CI/CD configs, or any YAML file to JSON instantly. Useful for debugging configuration, migrating between tools, or feeding config data into a JSON-only API.