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
Guide
JSON Schema Generator infers data types from JSON input and builds standard schema output for fast structure constraints and validation setup.
Key Features
- Supports Draft 04, 06, 07, 2019-09, and 2020-12 schema versions.
- Supports strict type inference, example generation, and required flags.
- Supports formatting, copy/download, and built-in validation workflow.
- Shows statistics for property, required, object, and array counts.
How To Use
- Select schema draft and optional title or description.
- Paste JSON data and toggle strict, examples, and required options.
- Review generated schema output and run validation.
- Copy or download schema for API and data constraints.
Use Cases
- API request and response structure constraints
- Configuration schema and input validation
- Data documentation and type declaration generation
- Field verification in development and testing
FAQ
- Why generation fails: input JSON usually has syntax errors.
- Why all fields are required: auto required option is enabled.
- How to debug validation fail: compare types, nesting, and array items.
- Will data be uploaded: no, processing runs fully in browser.
Privacy
Your JSON input and generated schema stay local in browser. No data is uploaded by this tool.