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Generate JSON Schema from example JSON instantly. Paste a sample document, pick your draft version, and get a valid schema for API validation, documentation, or code generation. No signup. Runs in your browser.
Free online JSON Schema generator. Paste example JSON and automatically infer a valid JSON Schema with support for Draft-04, Draft-06, Draft-07, and Draft 2020-12. Configure required fields, descriptions, and additional properties. No signup or server upload.
Your JSON Schema will appear here
Paste JSON and click Generate Schema
JSON Schema turns example data into a reusable contract. Use it to validate APIs, document payloads, and generate type-safe code across your stack.
Define the shape of request and response bodies once. Validators reject malformed data before it hits your application logic, reducing bugs in production.
JSON Schema describes every field, type, and constraint. Tools like Swagger and Redoc use schemas to produce accurate, always-up-to-date API docs.
Generate TypeScript interfaces, Python dataclasses, or Go structs directly from your schema. Keep frontend and backend types in sync without manual maintenance.
Validate configuration files, webhook payloads, and ETL data against a schema during development. Fix structural issues before they cause runtime failures.
Copy a sample JSON document from your API, config file, or database export. You can also upload a .json file or drag and drop it into the input area.
Select your JSON Schema draft version, toggle required field inference, add property descriptions, and choose whether to allow additional properties.
Click Generate Schema, review the output, then copy it to clipboard or download as a .json file. Use the schema with Ajv, OpenAPI, or any JSON Schema validator.
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