Private developer tools

YAML ↔ JSON Converter

Convert YAML to readable JSON or JSON to clean YAML, catch syntax errors, and download the result without uploading your data.

Private format converter

Convert structured data

Valid
JSON output
{
  "name": "Ada Lovelace",
  "role": "Programmer",
  "active": true,
  "skills": [
    "mathematics",
    "algorithms"
  ],
  "address": {
    "city": "London",
    "country": "United Kingdom"
  },
  "score": null
}
Object · 216 output characters

Two-way conversion

Move between YAML and JSON

Switch directions or swap the generated result into the editor. Nested objects, arrays, scalars, and Unicode remain structured throughout the conversion.

Validate safely

Find malformed data early

Invalid YAML and JSON produce useful parser feedback. Review the syntax-colored result before copying it into configuration files or application code.

How to use it

Get a reliable result

  1. Select YAML to JSON or JSON to YAML.
  2. Paste data or load the sample and convert it.
  3. Review types, quoting, and validation feedback before copying or downloading.

Useful for

Common workflows

  • Move a configuration example into an API request
  • Convert JSON data into a readable YAML starting point
  • Catch indentation or quoting errors before deployment

Examples

What to expect

Nested configuration
Input
service: enabled: true ports: [80, 443]
Output
A JSON object containing a boolean and numeric array

Know before you start

Important limitations

  • Round trips do not preserve comments, exact whitespace, key style, anchors, aliases, or document formatting.
  • The supported safe schema does not construct arbitrary application-specific objects or executable tags.
  • A syntactically valid conversion does not validate a product-specific configuration schema.

Keep exploring

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Common questions

YAML Converter FAQ

Is my YAML or JSON uploaded?

No. Parsing, validation, conversion, copying, and downloads happen entirely in your browser.

Does the converter support both directions?

Yes. Convert YAML to formatted JSON or switch directions to convert valid JSON into readable YAML.

Are YAML comments preserved?

No. Comments are not part of the parsed data model, so they are removed when YAML is converted and regenerated.

Which YAML features are supported?

The converter supports common YAML objects, arrays, strings, numbers, booleans, null values, anchors, aliases, and nested data using a security-maintained parser.

Browser-local

Processed on your device

YAML, JSON, and converted results stay in this browser and are never uploaded.

How this processing works

The tool reads and processes this input in your browser. Tool Packer's application server does not receive the input or generated result.

Read the full privacy explanation