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JSON Schema Generator

Generate JSON Schema from sample JSON, detect types, arrays, nested objects, required fields, enums, examples, and validation-friendly schema directly in your browser.

Paste a sample JSON object, array, API response, or config file. The schema is generated locally in your browser.

Options

A generated schema is a strong starting point. Review it before using it for real validation rules.

Output

Generated JSON Schema will appear here.
JSON Schema generation happens directly in your browser. Your pasted JSON is not uploaded to a server.

Generating JSON Schema From Sample JSON

JSON Schema is useful when you need to describe the shape of a JSON object, validate API responses, document request bodies, or keep data contracts clear. Writing a schema by hand can take time when the JSON has nested objects, arrays, nullable values, and mixed types.

This JSON Schema Generator reads sample JSON and creates a starting schema with detected types, object properties, array items, required fields, examples, and common formats like email, URI, and date-time.

Creating a Schema From JSON

  1. Paste a sample JSON object or array.
  2. Choose the JSON Schema draft version.
  3. Select how required fields and arrays should be handled.
  4. Generate the schema and review the detected structure.
  5. Copy the schema into your validator, API docs, or project files.

Common JSON Schema Generator Use Cases

  • Creating a first schema from an API response.
  • Documenting request and response body structure.
  • Preparing a schema before using a JSON Schema validator.
  • Finding nested object and array shapes in copied JSON.
  • Generating examples for internal notes or documentation.
  • Starting validation rules before editing them manually.

Example Generated Schema

{
  "type": "object",
  "properties": {
    "name": { "type": "string" },
    "active": { "type": "boolean" }
  },
  "required": ["name", "active"]
}

Generated Schemas Still Need Review

A generated schema is based only on the sample JSON you paste. If the sample is incomplete, the schema may miss optional fields, alternate types, valid enum values, or validation limits like minimum, maximum, pattern, and length.

Use this tool to create a good starting schema, then adjust the rules based on what your real data is allowed to contain.

Frequently Asked Questions

What does a JSON Schema Generator do?

It reads sample JSON and creates a JSON Schema that describes the detected object structure, types, arrays, and fields.

Is this different from a JSON Schema Validator?

Yes. A generator creates a schema from sample JSON. A validator checks JSON against an existing schema.

Can this handle nested JSON?

Yes. It detects nested objects, arrays, nullable values, and mixed array item types where possible.

Does this create a perfect production schema?

No. It creates a starting point. Review required fields, allowed values, patterns, and limits before using it for strict validation.

Is my JSON uploaded anywhere?

No. Schema generation happens directly in your browser.