JSON to Schema Converter

Paste a JSON or JavaScript object and get a TypeScript interface, Zod schema, JSON Schema, or YAML output instantly.

Tools
Output format
Output

Paste a JSON object above to generate a schema

Tips

  • Paste any valid JSON object or JavaScript object — schema generation is automatic.
  • JavaScript objects with unquoted keys, single-quoted strings, and trailing commas are supported.
  • The "Type name" field sets the root name for TypeScript interfaces and Zod schemas.
  • Nested objects and arrays are inferred recursively.
  • Array item types are detected from the items — mixed-type arrays become unknown[].

What is a schema converter?

When working with APIs or data pipelines, you often receive raw JSON and need to create type definitions or validation schemas. Writing these by hand is tedious and error-prone — especially for deeply nested structures.

This tool infers the shape of any JSON or JavaScript object and generates TypeScript interfaces, Zod schemas (for runtime validation), JSON Schema draft-07 (for documentation and validation), or YAML definitions — all instantly in your browser with no data sent anywhere.

Output formats

  • TypeScript — Generates interface definitions with precise types for each field. Useful for adding type safety to API responses in TypeScript projects.
  • Zod — Generates a z.object() schema for runtime validation. Use it with tRPC, react-hook-form, or any Zod-based validation pipeline.
  • JSON Schema — Generates a draft-07 JSON Schema, compatible with OpenAPI specs, form validators like AJV, and documentation tools.
  • YAML — Same as JSON Schema but serialized as YAML — useful for config files, OpenAPI specs, and human-readable schema documentation.