Free · Private · In-Browser

YAML to JSON Converter — Turn YAML Into JSON

This YAML to JSON converter parses YAML and emits pretty-printed JSON, fully in your browser. Useful when feeding a config file into a JSON-only tool — an API endpoint, a frontend mock, a JSON-schema validator, or a script that expects JSON input.

YAML is convenient to write but inconvenient to consume programmatically — most JS libraries, REST APIs, and quick scripts assume JSON. Converting your Kubernetes manifest, Helm values file, or GitHub Actions workflow into JSON makes it easy to inspect with `jq`, feed into a code editor with JSON schema autocomplete, or post to an HTTP endpoint.

The tool uses js-yaml, the canonical JavaScript YAML parser. Conversion runs locally in your browser, so any YAML containing secrets, internal hostnames, or proprietary config never leaves your device.

The output is JSON pretty-printed with two-space indentation — diff-friendly and easy to read. Numbers, booleans, and null come through as their proper types. YAML anchors and aliases are resolved into the corresponding JSON structures.

Frequently asked questions

Is my YAML uploaded?

No. Parsing happens locally in your browser via js-yaml. The YAML file stays on your device.

Does it handle YAML anchors and aliases?

Yes. Anchors (&) and aliases (*) are resolved into the corresponding nested JSON values.

Can it parse multi-document YAML files?

Multi-document YAML (separated by ---) is converted to a JSON array, with one element per document.

What about YAML-specific types like dates?

YAML dates are converted to ISO 8601 strings in the JSON output, since JSON has no native date type.

Can I copy the JSON instead of downloading?

Yes. A "Copy text" button appears next to the download.

Related tools

Files stay on your device. No login. Installs as a PWA on iPhone, Android, and desktop.
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