eth_chainId

Returns the chain ID of the current network.

Request Format

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

Response Format

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x1"
}

Parameters

None.

Return Value

Chain ID (uint): Returns the chain ID of the current network in hexadecimal format (with 0x prefix).

Example

Request

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

Response (for Mainnet)

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x1"
}

Notes

This method is useful for checking which blockchain network is currently in use.
Common chain IDs:
- Ethereum Mainnet: 0x1
- Ropsten Testnet: 0x3
- Rinkeby Testnet: 0x4
- Goerli Testnet: 0x5
- Kovan Testnet: 0x2a