JSON Schema Generator
Generate JSON Schema, TypeScript, Zod, and Python types from sample JSON, plus OpenAI, Anthropic, and Gemini tool definitions. Free and private in your browser.
JSON Schema, a tool definition, or generated types will appear here...
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Frequently asked questions
What is JSON Schema Generator?+
Turn a sample JSON document into a Draft 2020-12 JSON Schema, then export the same shape as an OpenAI, Anthropic, or Gemini tool definition — entirely in your browser.
How do I use JSON Schema Generator?+
Detects emails, UUIDs, URLs, dates, and date-times, and keeps integers exact. OpenAI output uses strict mode: every property is required and extra properties are rejected. Also emits TypeScript interfaces, Zod schemas, and Python TypedDicts from the same sample. Nothing you paste is uploaded
Is JSON Schema Generator free?+
Yes, JSON Schema Generator is completely free. No account or sign-up required, and all processing happens in your browser — nothing is sent to a server.
Is my data safe when I use JSON Schema Generator?+
Yes. JSON Schema Generator runs entirely in your browser using JavaScript and Web APIs — your input is never uploaded, transmitted, or stored on any server.