viem/_esm/actions/public/getChainId.js

TypeScript Interface for Ethereum

import { hexToNumber, } from '../../utils/encoding/fromHex.js';
/**
 * Returns the chain ID associated with the current network.
 *
 * - Docs: https://viem.sh/docs/actions/public/getChainId
 * - JSON-RPC Methods: [`eth_chainId`](https://ethereum.org/en/developers/docs/apis/json-rpc/#eth_chainid)
 *
 * @param client - Client to use
 * @returns The current chain ID. {@link GetChainIdReturnType}
 *
 * @example
 * import { createPublicClient, http } from 'viem'
 * import { mainnet } from 'viem/chains'
 * import { getChainId } from 'viem/public'
 *
 * const client = createPublicClient({
 *   chain: mainnet,
 *   transport: http(),
 * })
 * const chainId = await getChainId(client)
 * // 1
 */
export async function getChainId(client) {
    const chainIdHex = await client.request({
        method: 'eth_chainId',
    }, { dedupe: true });
    return hexToNumber(chainIdHex);
}
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