Does it support nested lists and maps?

Yes, the parser handles arbitrary nesting of maps and lists.

Are comments supported?

Lines starting with # are ignored when parsing YAML.

Is this a full YAML spec implementation?

No, it covers the common subset used in config files — anchors and multi-document files aren't supported.

Is my data uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your input never leaves your device and nothing is logged or stored on our servers.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

Yaml Json Converter

Convert YAML to JSON and JSON to YAML.

Support

Works Offline

Privacy First

No Login

No API

YAML input

Output

JSON

{
  "name": "Ada",
  "skills": [
    "logic",
    "math"
  ],
  "address": {
    "city": "London",
    "zip": "90210"
  }
}

About the Yaml Json Converter

A hand-written YAML parser and serializer supporting nested maps, lists, and scalars, so you can convert configuration files between YAML and JSON without leaving your browser.

Popular uses

yaml
json
yml
convert
config

Examples

Simple YAML

YAMLname: Ada

Output

YAML{"name":"Ada"}

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser