YAML To JSON Schema Generator

Generate a Draft-07 compliant JSON Schema directly from any YAML document without sending data to a remote server. Paste a sample configuration, manifest, or API contract and copy the inferred schema for validation, documentation, or code generation.

Why convert YAML into a JSON Schema?

• Validation: Catch malformed configuration files in CI before they reach production deployments.
• Documentation: Generate machine-readable contracts that complement human-friendly YAML docs.
• Tooling: Feed the schema into IDE extensions, linters, or generators that prefer JSON Schema over raw examples.
• Cross-format reuse: Reuse the same schema for YAML and equivalent JSON payloads since both share the same data model.

How inference works

The YAML is parsed with js-yaml into a native JavaScript value, then each branch is inspected recursively. Plain objects become type: object entries with their keys flagged as required; arrays produce type: array with items inferred from the first defined element. Primitives map to boolean, integer, number, or string. Date scalars surface as RFC 3339 strings with format: date-time.

Tips for accurate schemas

• Provide a sample that includes every optional field you care about so they appear in properties.
• For polymorphic arrays, place the most representative element first.
• Pick a descriptive root title so the schema is easy to identify in registries or IDE pickers.