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Documentation Index

Fetch the complete documentation index at: https://docs.phantom.com/llms.txt

Use this file to discover all available pages before exploring further.

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window.phantom.ethereum.chainId

The chainId of the network you are currently connected to, returned as a hexadecimal string. 
const chainId = window.phantom.ethereum.chainId;
console.log(chainId);
// "0x1"
// hexadecimal representation of Ethereum Mainnet