JSON Schema Generator
Generate JSON Schema (Draft 2020-12, 2019-09, Draft-07) from any JSON example. Infer types, required fields, and string formats (email, URI, UUID, date-time). Free online tool, 100% client-side.
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What is JSON Schema Generator?
JSON Schema Generator creates JSON Schema documents from any JSON example. It infers types (string, integer, number, boolean, null, object, array), detects common string formats (email, URI, UUID, date-time), and produces a schema compliant with Draft 2020-12, 2019-09, or Draft-07 — ideal for API contracts and data validation.
Key Benefits
- Standards-compliant JSON Schema output with correct $schema URI
- Automatic type inference including integer vs. number distinction
- String format detection for email, URI, UUID, date-time, and IPv4
- Multiple draft support: 2020-12, 2019-09, and Draft-07
- 100% client-side, no data leaves your browser
Common Use Cases
- •Defining API request and response contracts
- •Validating configuration files in CI/CD pipelines
- •Generating OpenAPI component schemas
- •Documenting data shapes for teams
- •Bootstrapping form validation from sample data
How to Generate JSON Schema
- Input: Paste your JSON object or array into the input area.
- Configure: Pick a draft (2020-12, 2019-09, Draft-07) and toggle required fields, format detection, or additionalProperties.
- Generate: The schema is generated automatically as you type or change options.
- Export: Copy the JSON Schema to clipboard or download it as a .json file.
Key Features
- Generate JSON Schema from any JSON example
- Infer types: string, integer, number, boolean, null, object, array
- Detect string formats: email, URI, UUID, date-time, IPv4, duration
- Merge heterogeneous array items into anyOf unions
- Choose Draft 2020-12, 2019-09, or Draft-07 with correct $schema URI
- Copy or download as a .json schema file