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JSON Schema Generator

Online JSON Schema generator that infers structure from JSON data and builds standard schemas

Input Options

JSON Data

Generated Schema

Generate schema after JSON input
Please input JSON data


Documentation

About JSON Schema Generator

This tool generates JSON Schema from sample JSON with draft selection, generation options, validation output, and statistics.

Key Features

  • Schema Inference: Derives field types and structure from sample JSON.
  • Draft Selection: draft-04/06/07/2019-09/2020-12.
  • Generation Toggles: Strict type, examples, required fields.
  • Validation + Stats: Validation summary and structure counts.
  • Copy/Download: Export schema quickly.

Steps

  1. Select schema draft version.
  2. Paste sample JSON.
  3. Configure options and generate schema.
  4. Review validation/stats and export output.

Use Cases

  • API contract drafting.
  • Form validation rule initialization.
  • Pre-ingestion structure constraint design.

FAQ

Does sample quality affect schema quality?

Yes. Better sample coverage leads to more reliable schema inference.

How are required fields determined?

Usually from consistently present fields in sample data; review critical fields manually.