eth_getCode - Monad

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 code at a given address. Used to verify if an address is a smart contract.

Parameters

Parameter

Type

Required

Description

address

string

Yes

The address to get the code from.

blockNumber

string

Block number in hex, or "latest", "earliest", "pending", "safe", "finalized".

Request examples

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": ["0x55962b6c47ae83427d02bcb9832adef4ece7bbf6", "latest"],
    "id": "getblock.io"
}'

example.js

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "eth_getCode",
    "params": ["0x55962b6c47ae83427d02bcb9832adef4ece7bbf6", "latest"],
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data)))
    .catch(error => console.log(error));

example.py

import requests
import json

url = "https://go.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "eth_getCode",
    "params": ["0x55962b6c47ae83427d02bcb9832adef4ece7bbf6", "latest"],
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)

main.rs

use reqwest::header;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    
    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header(header::CONTENT_TYPE, "application/json")
        .body(r#"{
            "jsonrpc": "2.0",
            "method": "eth_getCode",
            "params": ["0x55962b6c47ae83427d02bcb9832adef4ece7bbf6", "latest"],
            "id": "getblock.io"
        }"#)
        .send()
        .await?;
    
    println!("{}", response.text().await?);
    Ok(())
}

Response

response.json

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0x606060405260043610610062576000357c0100..."
}

Response Parameters

Field

Type

Description

result

string

The bytecode at the address. Returns "0x" for EOAs (externally owned accounts).

Use Case

The eth_getCode method is essential for:

Verifying if an address is a contract
Security checks before interactions
Contract bytecode analysis
Detecting proxy contracts
Block explorer functionality
Smart contract verification

Error Handling

Status Code

Error Message

Cause

403

Forbidden

Missing or invalid ACCESS-TOKEN.

-32602

Invalid params

Invalid address format.

-32000

Resource not found

Block not found.

Web3 Integration

ethers.js example

import { ethers } from 'ethers';

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

const code = await provider.getCode("0x55962b6c47ae83427d02bcb9832adef4ece7bbf6");

if (code === '0x') {
    console.log('This is an EOA (externally owned account)');
} else {
    console.log('This is a smart contract');
    console.log('Bytecode length:', (code.length - 2) / 2, 'bytes');
}

import { createPublicClient, http } from "viem";
import { monad } from "viem/chains";

// Create Viem client with GetBlock
const client = createPublicClient({
  chain: monad,
  transport: http(
    import.meta.env.MONAD_ACCESS_TOKEN
  ),
});

// Using the method through Viem
async function Call() {
  try {
    // Method-specific Viem implementation
    const result = await client.request({
      method: "eth_getCode",
      params: ["0x55962b6c47ae83427d02bcb9832adef4ece7bbf6", "latest"],
    });
    console.log("Result:", result);
    return result;
  } catch (error) {
    console.error("Viem Error:", error);
    throw error;
  }
}

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