Data Converters

JSON to JSON Schema Generator

Paste a JSON sample and instantly infer a JSON Schema draft-07 that describes its structure. Identifies types, required fields, array item shapes, and nested object properties, ready to use in validators or API documentation.

Infers JSON Schema from sample Browser-only Download .json schema
JSON JSON Schema
Paste JSON below, or drop a file
Options

Converted entirely in your browser; your data never leaves your device

Features

  • Infers JSON Schema draft-07 from any JSON sample
  • Detects string, number, boolean, array, object, and null types
  • Marks all present keys as required by default
  • Handles nested objects and arrays
  • Download as .json schema file
  • Browser-only

How to use it

  1. Paste a representative JSON sample into the input.
  2. The schema is inferred instantly.
  3. Review and adjust the generated schema as needed.
  4. Copy or download the .json schema file.

Use cases

  • Generating validation schemas for API responses
  • Documenting data structures for development teams
  • Creating starting schemas for form validators
  • Bootstrapping OpenAPI request/response schemas

Limitations

  • Type inference is based on the provided sample only. Optional or nullable fields may need manual adjustments.
  • Union types (string | number) are not inferred. Use anyOf manually for mixed-type fields.
See also

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Questions & answers

Frequently asked

Does it generate a perfect schema?

It infers a schema from one sample. For production use, review and extend it, especially for optional fields that aren't present in the sample.