Derive Macro JsonData 

#[derive(JsonData)]
{
    // Attributes available to this derive:
    #[json_data]
}

Derive macro that generates JS-compatible JSON serialization for Juno serverless function structs.

Automatically maps Candid types to their JsonData* equivalents (Principal → JsonDataPrincipal, Vec<u8> → JsonDataUint8Array, u64 → JsonDataBigInt) and generates:

• into_json_data() — serializes the struct to bytes for passing to the JS runtime
• from_json_data() — deserializes bytes from the JS runtime back into the struct

Example

#[derive(CandidType, Serialize, Deserialize, JsonData)]
pub struct InputArgs {
    value: Principal,
}

#[derive(CandidType, Serialize, Deserialize, JsonData)]
pub struct OutputArgs {
    value: Principal,
    text: String,
}

// Generated: InputArgsJsonData/OutputArgsJsonData structs + From impls + into_json_data() + from_json_data()