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JSON Toolbox- Free online JSON tools

YAML to JSON

Convert YAML to JSON online. Parses nested maps, sequences, and scalars into a formatted JSON document.

  • 100% client-side, nothing uploaded
  • Instant results
  • Works offline once loaded
Input YAML

Empty

JSON output

Empty

How it works

About this tool

This YAML to JSON converter parses YAML — including nested mappings, sequences, and multi-line scalars — and produces neatly formatted JSON. It is perfect for inspecting config files or feeding YAML-based data into tools that expect JSON.

The parser follows the YAML 1.2 specification, so anchors, quoted strings, and typed scalars are handled correctly. The output is pretty-printed with two-space indentation for easy reading and copy-paste.

Use it to debug Kubernetes or CI configs, compare YAML against JSON APIs, or prepare fixtures for JavaScript tooling.

Everything runs client-side in your browser, which means your YAML is never uploaded and the tool keeps working even offline.

JSON Toolbox processes all data locally in the browser. Nothing is uploaded to a server.

Common questions

Frequently asked questions

How do I convert YAML to JSON?
Paste your YAML (or load a file). Valid YAML is converted to pretty-printed JSON immediately. Fix any reported parse errors if the input is invalid.
What YAML features are supported?
Standard YAML 1.2: nested maps and sequences, quoted and plain scalars, booleans, numbers, null, multi-line strings, and common anchor/alias patterns supported by the underlying parser.
What happens if my YAML is invalid?
The converter reports the parse error so you can find and fix the problem. Only valid YAML produces JSON output.
Is my YAML sent to a server?
No. Parsing happens entirely in your browser, so your data never leaves your device.

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