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YAML to JSON Schema Converter

Paste a YAML document and get a JSON Schema that describes its structure — types, required fields, nested objects, and arrays.

Last updated: May 28, 2026

Client-Side Processing
Input Data Stays on Device
Instant Local Execution
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What is YAML to JSON Schema Converter?

This converter parses YAML to JSON internally and then infers a JSON Schema from the document structure. Scalar values are typed as string, integer, number, boolean, or null. Mappings become object schemas with properties, and sequences become array schemas with inferred item types.

How to Use YAML to JSON Schema Converter

1

Paste YAML into the input panel.

2

Set an optional schema title.

3

Choose a JSON Schema draft (2020-12 or Draft 07).

4

Toggle "require all fields" and "include examples".

5

Copy the generated JSON Schema.

Common Use Cases

  • Generating a JSON Schema from a YAML API example for validation.
  • Documenting YAML config file structure with a formal schema.
  • Creating schemas for CI/CD pipeline validation tools.
  • Bootstrapping an OpenAPI schema from a YAML data sample.

Example Input and Output

A small YAML mapping produces a JSON Schema with typed properties.

YAML input
name: Alice
age: 30
active: true
JSON Schema output
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "name": { "type": "string" },
    "age": { "type": "integer" },
    "active": { "type": "boolean" }
  },
  "required": ["name", "age", "active"]
}

Tip

Treat the generated schema as a starting point. Add enum constraints, format, pattern, minimum, and maximum rules to tighten validation for production use.

Frequently Asked Questions

What is JSON Schema?

JSON Schema is a vocabulary for validating and describing JSON (and YAML) documents. It defines types, required fields, patterns, and constraints.

Which draft should I use?

2020-12 is the latest standard. Use Draft 07 for compatibility with older tooling like AJV v6 or older OpenAPI validators.

Is the YAML sent to a server?

No. All parsing and schema generation happen entirely in your browser.

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