facet-json-schema

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"]
}

LLM contribution policy

Sponsors

Thanks to all individual sponsors:

...along with corporate sponsors:

...without whom this work could not exist.

Special thanks

The facet logo was drawn by Misiasart.

License

Licensed under either of:

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.