Manage Starknet networks

You can detect a user's Starknet network and prompt them to switch Starknet networks in MetaMask, using the get-starknet library or the wallet_invokeSnap JSON-RPC method.

Prerequisites

Connect to Starknet from your dapp.

Detect a user's network

Detect the Starknet network a user is currently connected to using the following:

get-starknet

const checkCurrentNetwork = (wallet) => {
  try {
    if(wallet?.isConnected !== true){
      throw("Wallet not connected");
    } 
    const currentNetwork = wallet?.chainId
    console.log("Currently connected to:", currentNetwork);
    return currentNetwork;
  } catch (error) {
    console.error("Error of detect current connected network:", error);
  }
};

wallet_invokeSnap

const checkCurrentNetwork = async () => {
  const provider = await getEip6963Provider(); // Or window.ethereum if you don't support EIP-6963.
  if (provider) {
    try {
      const response = await provider.request({
        method: "wallet_invokeSnap",
        params: {
          snapId: "npm:@consensys/starknet-snap",
          request: {
            method: "starkNet_getCurrentNetwork"
          }
        }
      });
      
      console.log("Currently connected to:", response.name);
      return response.chainId;  // Returns the chain ID.
    } catch (error) {
      console.error("Error getting current Starknet network:", error);
      throw error;
    }
  } else {
    console.error("MetaMask not detected or Snaps not supported");
    throw new Error("MetaMask not detected or Snaps not supported");
  }
};

checkCurrentNetwork().then(chainId => {
  console.log("Chain ID:", chainId);
}).catch(error => {
  console.error("Error:", error);
});

Switch networks

Starknet currently supports two public networks, Mainnet and Sepolia testnet. Prompt users to switch between networks by setting the chain ID of the target network:

get-starknet

const switchChain = async (wallet, chainId) => {
  try {
    if(wallet?.isConnected !== true){
        throw("Wallet not connected");
    }
     
    await wallet?.request({
      type: "wallet_switchStarknetChain",
      params: { chainId: chainId },
    });
    console.log(`Switched to chainId: ${chainId}`);
  } catch (e) {
    console.error("Failed to switch chain:", e);
  }
};

wallet_invokeSnap

const switchStarknetNetwork = async (chainId) => {
  const provider = await getEip6963Provider(); // Or window.ethereum if you don't support EIP-6963.
  if (provider) {
    try {
      await provider.request({
        method: "wallet_invokeSnap",
        params: {
          snapId: "npm:@consensys/starknet-snap",
          request: {
            method: "starkNet_switchNetwork",
            params: { chainId: chainId }
          }
        }
      });
      console.log(`Switched to Starknet network with chainId: ${chainId}`);
    } catch (error) {
      console.error("Error switching Starknet network:", error);
      throw error;
    }
  } else {
    console.error("MetaMask not detected or Snaps not supported");
    throw new Error("MetaMask not detected or Snaps not supported");
  }
};