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JSON Schema Generator

Draft-07FreePrivate

Generate JSON Schema automatically from sample JSON data. Useful for validation, APIs, forms, contracts, and documentation. Runs privately in your browser.

  • Create schema in one click
  • Great for validation rules
  • Useful for APIs & forms
  • No upload required
JSON input

Paste sample JSON object or array.

Generated schema
Ctrl+Enter Generate Schema

JSON Schema from JSON: Generator Online

Paste a JSON sample and get a draft-07 JSON Schema with inferred types, required fields, and nested object shapes — generate JSON Schema from JSON instantly, with no schema-writing by hand. Once generated, run it through the JSON Schema Validator to confirm sample data conforms.

Why Use JSON Schema?

Validate Data
Ensure incoming JSON matches expected structure.
Better APIs
Define payload contracts clearly.
Dynamic Forms
Use schema-driven form builders.
Save Time
Generate instead of writing schema by hand.

How to Use

  1. Paste sample JSON.
  2. Enter schema title.
  3. Click Generate Schema or press Ctrl+Enter.
  4. Review output.
  5. Copy or download schema.json.

Example

Input
{
  "name": "Alice",
  "age": 30
}
Output concept
{
  "type": "object",
  "properties": {
    "name": { "type": "string" },
    "age": { "type": "number" }
  }
}

Features

  • Instant schema generation
  • Draft-07 output
  • Nested object support
  • Array support
  • Private browser processing
  • Copy or download schema

Frequently Asked Questions

Is this free?

Yes. Generate schemas as often as you need at no charge.

Is my JSON uploaded?

No. Everything runs locally in your browser.

Which schema version is supported?

The tool emits JSON Schema draft-07 with a standard $schema URI.

Does it support nested objects?

Yes. Nested structures become nested properties in the schema.

Can arrays be included?

Yes. Arrays are described with items and inferred element types.

Can I rename the schema title?

Yes. Use the Schema Title field on desktop or in the SCHEMA sheet on mobile before generating.

What if my JSON is invalid?

Use the JSON Formatter or JSON Repair to fix syntax, then try again.

Does it work on mobile?

Yes. The layout is touch friendly with a sticky generate bar and export sheet.

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