🏗️ JSON Schema Builder
Auto-generate JSON Schema draft-07 from any JSON, or build visually. Export for OpenAI & Anthropic tool calling.
About JSON Schema Builder
Writing JSON schemas by hand is tedious and error-prone — especially when your data structure is nested. This tool takes any JSON sample you paste in and instantly generates a matching JSON Schema (draft-07), saving you from hours of boilerplate. You can also build schemas visually by adding fields, types, and constraints through a point-and-click UI instead of writing raw JSON.
This is especially handy when working with OpenAI function calling or Anthropic tool use, where you need to define a precise tool schema. Paste your example response, get a clean schema, and copy it straight into your AI project. Everything runs in the browser — nothing is sent anywhere.
Add fields to build your schema interactively.