JSON-RPC API Overview

http://127.0.0.1:8545

--http-host 127.0.0.1 --http-port 8545

{
  "jsonrpc": "2.0",
  "method": "method_name",
  "params": [],
  "id": 1
}

{
  "jsonrpc": "2.0",
  "result": { },
  "id": 1
}

{
  "jsonrpc": "2.0",
  "error": {
    "code": -32601,
    "message": "Method not found"
  },
  "id": 1
}

import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('http://127.0.0.1:8545');
const blockNumber = await provider.getBlockNumber();
console.log('Current block:', blockNumber);

import Web3 from 'web3';

const web3 = new Web3('http://127.0.0.1:8545');
const blockNumber = await web3.eth.getBlockNumber();
console.log('Current block:', blockNumber);

curl -X POST http://127.0.0.1:8545 \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_blockNumber",
    "params": [],
    "id": 1
  }'