Stop writing boilerplate
EVM chain config

One .env file. All frameworks — Hardhat, Foundry, viem, and ethers. 18+ chains auto-detected.

$ npm install evmchain-config

The problem

Every Solidity project has this boilerplate. It's fragile, repetitive, and error-prone.

// The old way — repeated for every project
import * as dotenv from 'dotenv';
dotenv.config();

const config: HardhatUserConfig = {
  networks: {
    ethereum: { url: process.env.ETHEREUM_RPC_URL!, chainId: 1, accounts: [process.env.PRIVATE_KEY!] },
    arbitrum: { url: process.env.ARBITRUM_RPC_URL!, chainId: 42161, accounts: [process.env.PRIVATE_KEY!] },
    base:     { url: process.env.BASE_RPC_URL!,     chainId: 8453,  accounts: [process.env.PRIVATE_KEY!] },
    optimism: { url: process.env.OPTIMISM_RPC_URL!, chainId: 10,    accounts: [process.env.PRIVATE_KEY!] },
    // ... repeated 10 more times
  }
};
      

The solution

One config loader. Works with every EVM framework.

HARDHAT

import { loadEvmChainsSync } from 'hardhat-evmchain';

export default {
  solidity: '0.8.24',
  ...loadEvmChainsSync(),
};
          

VIEM

import { createMultichainClients }
  from 'viem-multichain';

const { getClient } =
  await createMultichainClients();
const eth = getClient('ethereum');
          

.ENV (ONE FILE FOR ALL FRAMEWORKS)

ETHEREUM_RPC_URL=https://eth-mainnet.g.alchemy.com/v2/YOUR_KEY
ARBITRUM_RPC_URL=https://arb-mainnet.g.alchemy.com/v2/YOUR_KEY
BASE_RPC_URL=https://base-mainnet.g.alchemy.com/v2/YOUR_KEY
PRIVATE_KEY=0x...
        