DataHub Tools YAML to JSON

YAML to JSON Converter

Local-first

Convert YAML config into formatted JSON in your browser.

What is YAML to JSON?

Convert YAML config into formatted JSON in your browser.

  • Convert YAML to formatted JSON
  • Validate YAML syntax
  • Prepare config data for APIs

How to use it

  1. Paste YAML containing a mapping, sequence, or scalar value.
  2. Convert and inspect inferred strings, numbers, booleans, nulls, and dates.
  3. Check anchors, aliases, merge keys, and duplicate keys before relying on the JSON.
  4. Download the JSON after confirming comments and YAML-specific structure are not required.

Quick example

Example input

name: Ada
skills:
  - SQL
  - Python
active: true

Expected output

{
  "name": "Ada",
  "skills": ["SQL", "Python"],
  "active": true
}

JSON cannot preserve YAML comments, anchors, aliases, tags, or every YAML-specific type and presentation detail.

Best use cases

  • Convert configuration data for JSON-based APIs.
  • Inspect YAML structures in a familiar JSON form.
  • Prepare simple mappings and lists for downstream tools.

Reference standards and behavior

YAML 1.2.2 and RFC 8259 overlap for common mappings, sequences, and scalars but are not identical. The conversion keeps parsed values, not YAML formatting or comments.

Sources checked July 24, 2026. Standards can change; review the source pages before formal integration.

Notes

  • The page uses js-yaml locally in the browser.
  • Type inference can change quoted and unquoted values differently.
  • Review untrusted YAML and application-specific schema rules before use.

FAQ

Which parser is used?

The page runs js-yaml locally in the browser.

Are comments preserved?

No. JSON has no comment syntax, so YAML comments are discarded.

What happens to anchors and aliases?

They are resolved during parsing; the original anchor and alias notation is not preserved.

Can value types change?

Yes. YAML type inference can produce numbers, booleans, nulls, dates, or strings, so inspect the JSON result.

Is untrusted YAML automatically safe?

No. Review untrusted input and validate the converted result against your application's schema.

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