JSON Schema Generator
Paste a sample JSON and automatically generate its JSON Schema (draft 2020-12) with inferred types, required fields and properties. Add descriptions and examples.
Example JSON
JSON Schema (draft 2020-12)
How to use: JSON Schema
- 1Paste a sample JSON.
- 2The tool infers types and required fields.
- 3Copy the generated JSON Schema (draft 2020-12).
What is it for?
- Document an API contract from a real response.
- Validate input data in forms or services.
- Get a starting point for OpenAPI.
Generating a JSON Schema
What it is for
A JSON Schema describes the structure a document must follow: types, required fields and formats. It is used to validate API requests, forms and configuration files.
Inferred, not definitive
From a single example you can only infer what appears in it. Review the generated schema: add truly required fields, constraints such as minLength or enum, and formats like email or date-time.
Validation in practice
Libraries such as Ajv (JavaScript) or jsonschema (Python) apply the schema and return clear errors, preventing malformed data from reaching your business logic.
Related tools
Frequently asked questions
How does it infer types?+
It analyzes the type of each property in your example and generates the corresponding schema (string, number, boolean, array, object...).