local_node_info - Nervos

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

Returns information about the local node — node ID, version, listen addresses, peer connection counts.

Parameters

• None

Request Example

cURL

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

JavaScript (Axios)

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "local_node_info",
    "params": [],
    "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, null, 2)))
    .catch(error => console.log(error));

Python (Requests)

import requests
import json

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

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

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

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

Rust (Reqwest)

use reqwest::Client;
use serde_json::json;

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

    let payload = json!({
        "jsonrpc": "2.0",
        "method": "local_node_info",
        "params": [],
        "id": "getblock.io"
});

    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&payload)
        .send()
        .await?;

    let result: serde_json::Value = response.json().await?;
    println!("{:#?}", result);

    Ok(())
}

Response Example

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "active": true,
        "addresses": [
            {
                "address": "/ip4/0.0.0.0/tcp/8115/p2p/QmUsZHPbjjzU627UZFt4k8j6ycEcNvXRnVGxCPKqwbAfQS",
                "score": "0xff"
            }
        ],
        "connections": "0x14",
        "node_id": "QmUsZHPbjjzU627UZFt4k8j6ycEcNvXRnVGxCPKqwbAfQS",
        "protocols": [
            {
                "id": "0x0",
                "name": "/ckb/ping",
                "support_versions": [
                    "0.0.1"
                ]
            }
        ],
        "version": "0.117.0 (a0ff732 2026-02-15)"
    }
}

Response Parameters

Field	Type	Description
result.node_id	string	Peer ID of the local node
result.version	string	CKB software version
result.active	boolean	Whether the node is participating in the P2P network
result.addresses	array of NodeAddress	Node's listen addresses
result.connections	Uint64	Number of currently connected peers
result.protocols	array of LocalNodeProtocol	P2P protocols supported by this node

Use Cases

• Node identity verification

• P2P health checks

• Capability detection in multi-provider environments

Error Handling

Status Code	Error Message	Cause
403	Forbidden	Missing or invalid <ACCESS-TOKEN>
-32602	Invalid params	Request parameters are missing or malformed
-32601	Method not found	Method does not exist or is not enabled on this node
-32603	Internal error	Server-side error while processing the request
429	Too Many Requests	Rate limit exceeded for your plan

SDK Integration

@ckb-lumos/lumos

import { RPC } from '@ckb-lumos/rpc';

const rpc = new RPC('https://go.getblock.io/<ACCESS-TOKEN>/');

// Lumos provides typed methods on `rpc` (e.g. rpc.getTipHeader(), rpc.getBlock(hash)).
// For raw access to any CKB RPC method:
const result = await rpc.send('local_node_info', []);
console.log(result);

ckb-sdk-python / requests

# Using the official CKB SDK Python (ckb-sdk-python).
# For methods not yet wrapped, fall back to raw requests.
import requests

response = requests.post('https://go.getblock.io/<ACCESS-TOKEN>/', json={
    'jsonrpc': '2.0',
    'id': 'getblock.io',
    'method': 'local_node_info',
    'params': []
})
print(response.json())