Is the YAML to JSON converter free?

Yes, completely free with no signup required.

Can anyone see the YAML I paste here?

No one. Parsing happens locally in your browser via js-yaml; the tool has no backend and your configuration data is never sent anywhere.

What YAML features are supported?

Anchors, aliases, multi-line strings, block/flow scalars, sequences, mappings, comments (stripped in JSON output), and YAML 1.2 types.

Are YAML comments preserved in JSON?

No. JSON does not support comments, so YAML comments are stripped during conversion.

Can I convert multi-document YAML?

Yes. Separate multiple YAML documents with --- and the tool converts the first document. Use the JSON to YAML tool to go back.

Dev Tools

YAML to JSON Converter Online Free

Convert YAML to JSON in real time. Handles anchors, aliases, and complex structures. Browser-based.

Files never storedInstantNo signup

🔒 Your file never leaves your browser. Conversion uses js-yaml locally.

JSON indent:

YAML Input

JSON Output

{
  "name": "John Doe",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "Springfield",
    "country": "USA"
  },
  "hobbies": [
    "reading",
    "cycling",
    "coding"
  ],
  "active": true
}

How to Convert YAML to JSON Online

1
Paste your YAML
Paste or type YAML content into the input box.
2
View the JSON output
The converted JSON appears instantly in the output panel as you type.
3
Copy the JSON
Click Copy to copy the formatted JSON to your clipboard.

Most tooling that consumes configuration — REST APIs, JavaScript applications, databases, validation libraries — speaks JSON, while much of that configuration is written and maintained in YAML. This converter bridges the gap in the direction the machines need: paste a YAML document and get strict, valid JSON you can POST to an API, feed to a script, or store in a document database.

YAML's power features are resolved, not copied: anchors and aliases (&/*) are expanded into the values they reference, multi-line block scalars are folded into escaped strings, and YAML's unquoted types are normalised to JSON's stricter forms. The output is plain JSON with no YAML-isms left — exactly what a JSON parser downstream expects.

One-way losses to know about:comments do not exist in JSON, so they are stripped; and YAML's type inference (an unquoted no becoming boolean false, or 3.10 becoming the number 3.1) is a classic source of surprises. If a value looks wrong in the JSON output, quote it in the YAML source and convert again.

Round trip: the JSON to YAML converter goes the other way, and the JSON formatter validates and pretty-prints the result if you need to inspect it before use.

Frequently Asked Questions

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