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

Convert YAML configuration files to JSON online for free.

YAMLUpload file

JSON

Frequently asked questions

Convert YAML to JSON Online Free — YAML Configuration Converter

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. Our YAML to JSON converter parses your YAML input — including nested structures, arrays, and multi-line strings — and outputs clean, properly formatted JSON. Works with any valid YAML including anchors and aliases.

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.