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facet-json-schema

Generate JSON Schema from facet type metadata.

This crate uses facet's reflection capabilities to generate JSON Schema definitions from any type that implements Facet. The generated schemas can be used for:

API documentation (OpenAPI/Swagger)
Runtime validation
Cross-language type generation
Editor autocompletion

Usage

use facet::Facet;
use facet_json_schema::to_schema;

#[derive(Facet)]
struct User {
    name: String,
    age: u32,
    email: Option<String>,
}

let schema = to_schema::<User>();
println!("{}", schema);

Output

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "name": { "type": "string" },
    "age": { "type": "integer", "minimum": 0, "maximum": 4294967295 },
    "email": { "type": "string" }
  },
  "required": ["name", "age"]
}