What YAML version is supported?

YAML 1.2 via js-yaml. Anchors, aliases, multiline strings, and flow/block styles are all handled.

Does this handle large files?

Yes — conversion runs in your browser and can handle files up to tens of megabytes, limited only by available memory.

Is my data uploaded anywhere?

No. All conversion happens client-side. Nothing is sent to a server.

JSON ↔ YAML Converter

Free bidirectional converter between JSON and YAML. Paste JSON to get clean YAML, or paste YAML to get formatted JSON. Validates syntax, reports errors with line numbers, and preserves numbers, booleans, nulls, and nested objects/arrays. Runs entirely in your browser — data never leaves your machine.

JSON input

YAML output

name: eztooly
version: 1
features:
  - fast
  - free
meta:
  free: true
  auth: null

Frequently Asked Questions

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