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Metamask: How to programmatically change the RPC URL

As of last update 2023. April The official MetaMask API documentation does not directly allow programmatically changing the « rpcUrl » parameter. However, it suggests several ways to achieve this, which may not be as simple or efficient as you would expect, but are still suitable under certain conditions.

Method 1: Using the Web3.js library and its eth_accounts method

You can use the Web3.js library to get current accounts from the MetaMask « RPC URL ». You can then compare them to the desired RPC URL. Here is a simplified example:

async function changeRpcUrl() {
Attempt {
// Get the current account (should be "0x...")
const currentAccount = await Web3.eth.getAccounts();
// Desired RPC URL
const newRpcUrl = '
// Check if the account is "0x..." and compare it to your RPC URL
if (currentaccount[0] === '0x...') {
console.log('Account matches new RPC URL');
// Update Web3 instance or network configuration to use the new RPC URL
} More {
console.log('Account does not match new RPC URL');
}
} catch(error) {
console.error(error);
}
}
editRpcUrl();

Note that you may need to manually change your network configuration to directly modify your web3 instance.

Method 2: Using the MetaMask API Endpoint to Change rpcUrl

The official MetaMask API has a method called « setRpcUrl » that you can use, but as in the Web3.js example above, using this method requires manually updating the account RPC URL. However, note that there is no direct way to do this through the MetaMask browser UI, as you might expect.

Here’s how:

async function changeRpcUrl() {
Attempt {
// Get the current account (should be "0x...")
const currentAccount = await Web3.eth.getAccounts();
// The desired RPC URL
const newRpcUrl = '
// Programmatically set the rpcUrl parameter
wait provider.setRpcUrl(newRpcUrl, {
// Additional parameters can be set here if needed (e.g. chain ID)
});
} catch(error) {
console. error(error);
}
}
editRpcUrl();

A note about web3 and network configuration

It is recommended that you manually manage your network configuration rather than relying on the provided methods, as changes may propagate across multiple circuits or networks.

Always refresh your web3 instance before updating any RPC URLs.