eth_getCode - Sonic

Example code for the eth_getCode JSON-RPC method. Complete guide on how to use eth_getCode JSON-RPC in GetBlock Web3 documentation.

This method returns the compiled bytecode deployed at an address. An externally owned account returns 0x, while a contract returns its runtime bytecode.

Parameters

Parameter	Type	Required	Description
address	string	Yes	20-byte address to read code from
blockParameter	string	Yes	Block number in hex, or "latest", "earliest", "pending"

Request

cURL

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getCode",
    "params": ["0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38", "latest"],
    "id": "getblock.io"
}'

Axios

example.js

const axios = require('axios');

const response = await axios.post('https://go.getblock.io/<ACCESS-TOKEN>/', {
    jsonrpc: '2.0',
    method: 'eth_getCode',
    params: ["0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38", "latest"],
    id: 'getblock.io'
}, {
    headers: { 'Content-Type': 'application/json' }
});

console.log(response.data.result);

Request

example.py

import requests

response = requests.post(
    'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers={'Content-Type': 'application/json'},
    json={
        'jsonrpc': '2.0',
        'method': 'eth_getCode',
        'params': ["0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38", "latest"],
        'id': 'getblock.io'
    }
)

print(response.json())

Rust

example.rs

use reqwest::Client;
use serde_json::{json, Value};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "eth_getCode",
            "params": ["0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38", "latest"],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;

    println!("Result: {}", response["result"]);
    Ok(())
}

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0x6080604052600436106101c25760003560e01c8063..."
}

Response Parameters

Parameter	Type	Description
jsonrpc	string	JSON-RPC protocol version ("2.0")
id	string	Request identifier matching the request
result	string	Hex-encoded runtime bytecode, or 0x for a non-contract account

Use Cases

• Contract Detection: Distinguish a contract from an externally owned account

• Bytecode Verification: Compare deployed bytecode against a compiled artifact

• Proxy Inspection: Read the runtime code behind a proxy address

• Security Analysis: Retrieve bytecode for static analysis

Error Handling

Error Code	Message	Description
-32602	Invalid params	The address is not a valid 20-byte hex string, or the block tag is invalid
-32603	Internal error	The node failed to read the requested state

Web3 Integration

Ethers.js

ethers-example.js

const { ethers } = require('ethers');

const provider = new ethers.JsonRpcProvider('https://go.getblock.io/<ACCESS-TOKEN>/');

const code = await provider.getCode('0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38');
console.log(code);

Viem

viem-example.js

import { createPublicClient, http } from 'viem';
import { sonic } from 'viem/chains';

const client = createPublicClient({ chain: sonic, transport: http('https://go.getblock.io/<ACCESS-TOKEN>/') });

const code = await client.getBytecode({ address: '0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38' });
console.log(code);