YAML to JSON Converter

Convert YAML to JSON online

Convert YAML to JSON quickly in your browser. PicoToolkit’s YAML → JSON converter preserves structure, produces readable (pretty‑printed) JSON, and validates input — no upload required.

How to use

• Paste YAML text into the editor (single document only — multi‑document YAML with --- is not supported).
• Click Convert → YAML to JSON. The tool parses the YAML and shows JSON output you can copy or download.
• Toggle pretty/compact output if you need compact JSON for downstream tools.
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Supported features & limitations

• Single‑document YAML only — the converter does not process multiple documents separated by ---.
• Types are preserved where possible: numbers, booleans and null become their JSON equivalents.
• Comments are not preserved in JSON (JSON does not support comments).
• Parsing errors are reported with line/column information to help you fix invalid YAML before conversion.
• Conversion runs client‑side in your browser — your data stays on your device.

Examples (copyable)

• Simple mapping
  YAML input:

  name: My App
  version: 1.2
  debug: false

  JSON output:

  {
    "name": "My App",
    "version": 1.2,
    "debug": false
  }

• Nested objects & arrays
  YAML input:

  servers:
    - host: api.example.com
      port: 443
    - host: backup.example.com
      port: 8443

  JSON output:

  {
    "servers": [
      {"host":"api.example.com","port":443},
      {"host":"backup.example.com","port":8443}
    ]
  }

• OpenAPI fragment
  YAML input (short):

  openapi: 3.0.0
  info:
    title: Example API
    version: 1.0.0

  JSON output:

  {
    "openapi":"3.0.0",
    "info":{"title":"Example API","version":"1.0.0"}
  }

• Screenshots
  

Local equivalents

If you prefer to convert locally, use standard libraries:

• JavaScript (js-yaml): const obj = jsyaml.load(yamlString); JSON.stringify(obj, null, 2)
• Python (PyYAML): obj = yaml.safe_load(yaml_text); json.dumps(obj, indent=2)

Tips & edge cases

• Fix YAML syntax errors reported by the tool (line/column) before converting.
• Remember YAML tags and custom types may not map cleanly to JSON — validate the resulting JSON against your schema or OpenAPI spec if relevant.
• For very large files, browser memory limits may apply; consider a local script for bulk conversions.
• Use the pretty/compact toggle depending on whether you need readable JSON or compact output for machine processing.

Related tools & workflows

Combine converters for common workflows (clean → validate → convert):

• JSON to YAML translator — reverse the process when needed.
• Markdown to HTML, XML to JSON, and JSON to CSV — chain converters inside PicoToolkit for multi-step workflows.
• Use the JSON output in your API clients, configuration files, or downstream tooling.

FAQ

Does the converter support multiple YAML documents separated by ---?

No. This tool supports single‑document YAML only. For multi‑document files, split them before converting.

Will comments be kept in the JSON output?

No. JSON does not support comments; comments in the YAML input are removed during conversion.

Is conversion private?

Yes. Conversion runs in your browser; PicoToolkit does not upload your text during normal operation.