Function encode_json_data 

pub fn encode_json_data<T: Serialize>(data: &T) -> Result<Vec<u8>, String>

Encodes a Rust struct into JSON bytes.

Serializes the provided data into a byte vector using Serde and serde_json. Supports Juno’s extended JSON conventions for IC types such as Principal, u64 (bigint), and Vec<u8> (Uint8Array), which are encoded using @dfinity/utils compatible markers.

Parameters

• data: A reference to the Rust data structure to be serialized.

Returns

• Ok(Vec<u8>): A byte vector containing the JSON-encoded data.
• Err(String): An error string if serialization fails.

Example

#[derive(Serialize)]
struct MyData {
    name: String,
}

let bytes = encode_json_data(&my_data)?;