Crate json_to_struct

json2struct: Compile-Time Struct Generation

A powerful procedural macro for generating Rust structs from JSON-like structures with extensive compile-time type safety and configuration options.

Features

• Automatic struct generation from JSON-like syntax
• Flexible type inference
• Serde integration
• Compile-time type checking
• Multiple configuration flags

Basic Usage

// Simple struct generation
json2struct!(User {
    "first_name" => "John",
    "last_name" => "Doe",
    "age" => 30
});

Output

#[derive(Clone, Deserialize, Serialize)]
struct User {
  #[serde(alias = "first_name")]
  first_name: String,

  #[serde(alias = "last_name")]
  last_name: String,

  #[serde(alias = "age")]
  age: f64
}

Example with Flags

// Complex struct with multiple configurations
json2struct!(Company @debug @camel @derive(PartialEq) @store_json {
    "company_name" => "Acme Corp",
    "employees" => [
        {
            "id" => 1,
            "details" => {
                "email" => "john@example.com",
                "department" => "Engineering"
            }
        }
    ]
});

Output

static COMPANY_JSON_VALUE: LazyLock<Value> = LazyLock::new(||

{
  ::serde_json::from_str(
          "{\"company_name\":\"Acme Corp\",\"employees\":[{\"details\":{\"department\":\"Engineering\",\"email\":\"john@example.
com\"},\"id\":1.0}]}",
       )
       .expect("Couldn't convert the text into valid json")
  });

#[derive(Debug, PartialEq, Clone, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
struct Company {
  #[serde(alias = "company_name")]
  company_name: String,

  #[serde(alias = "last_name")]
  employees: CompanyEmplyees
}

#[derive(Debug, PartialEq, Clone, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
struct CompanyEmplyees {
  #[serde(alias = "id")]
  id: f64,

  #[serde(alias = "details")]
  details:  
}

#[derive(Debug, PartialEq, Clone, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
struct CompanyEmplyeesDetails {
  #[serde(alias = "email")]
  email: String,

  #[serde(alias = "department")]
  department: String
}

Supported Flags

Flag	Description	Example
@debug	Adds Debug derive	@debug
@snake	Renames fields to snake_case	@snake
@camel	Renames fields to camelCase	@camel
@pascal	Renames fields to pascal	@pascal
@derive(Type)	Adds custom derives	@derive(PartialEq, Clone)
@store_json	Generates a static JSON Value constant	@store_json

Macros

json2struct

json2struct: Generates Rust structs from JSON-like structures