Utilio

JSON Schema Generator

Free

Paste a JSON example and get a JSON Schema (draft-07) automatically generated. Updates in real time.

Type Inference Rules

"text"→type: "string"
42→type: "integer"
3.14→type: "number"
true→type: "boolean"
null→type: ["null"]
"foo@bar.com"→format: "email"
"https://..."→format: "uri"
"2024-01-01T..."→format: "date-time"

What is JSON Schema?

JSON Schema is a vocabulary that allows you to annotate and validate JSON data. It defines the structure, types, required fields and constraints for JSON documents.

Why Generate JSON Schema?

Auto-generating a schema from sample data saves time and ensures your API contracts, config files and documentation stay consistent with actual data structures.

Features

  • Real-time schema generation as you type
  • Infers types, formats (email, URI, date-time) and nested structures
  • Customizable schema title and metadata
  • Supports arrays with mixed types via oneOf
  • Outputs draft-07 compliant JSON Schema

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