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Metamask: Metamask: wallet_addEthereumChain is not working when using polygon mainet but works with polygon mumbai
Metamask Problem: Walletaddetherumchain does not work on polygon main but not polygon mumbai
As a Metamask User, You Are Probable No Stranger To The Frustration of Switching Between Different Blockchain Networks. However, when using the metamask ‘wallet_addetherum’ method of metamask, it seems that it does not work as planned the transition from polygon main to polygon mumbai.
In this article, we will omisselves in the Problem and Explore the Possible Solutions to Solve This Problem.
The Problem
When you try to switch between Different blockchain Networks Using the Metamask Wallet_Addetherum ‘Method, The Following Error Can Occur:
`JavaScript
Ethereum: Cannot Add More Than One Network. The "Polygon Mumbai" Network Already Exists.
”
This indicates that metamask is trying to add a new network (polygon mumbai) when it already has an existing network (polygon mainnet).
The Problem
It seems that the wallet_addetherumchain method does not take into account the presence of several ethereum Networks. When you ask for a new channel, Metamask Uses the First Network available in your wallet. However, when switching between different networks, he seems to ignore existing Networks and Try to add them again.
The Solution
To resolve this problem, you can use the following approach:
- List of available Networks : Before Tryping to Switch Between Networks, List All Ethereum Networks Available Using the MetamaskListallacces’ method.
- Check the existing Network : Check that there are no double network names in your wallet.
- go to polygon mumbai
: If you want to go to polygon mumbai, use the following code:
`JavaScript
Const polygonmumbainetworkname = 'polygon mumbai';
ConstantnetWorknames = Await Listtallaccouts ();
Const existingwork index = existantworknames.findindex (Network => Network.name === polygonmumbainetworkname);
If (existing work index! == -1) {
// Remove the Existing Network from Your Wallet.
Const AsseWorkchouthent = Await Metamask.getnetWorkcount (ExistantNetWorkindex);
Await brake oven networkfrom (Existantworkcount.networkid, Existantwork index);
}
”
Note that this approach assumes that you have a “Networks” object in your wallet data. Otherwise, you may have to recover the list of Networks aviale using listallaccouts () ', then pass to each Network to find the one that corresponds to the desired name.
- Add the polygon Mumbai Network: Once you have deleted the existing Network, Add the new to your wallet using:
JavaScript
Const polygonmumbainetwork = {
Id: 'Polygon Mumbai',
Chainid: 431911,
Address: '0x ...' // Replace with the address generated for polygon mumbai.
};
Wait metamask.addnetwork (polygonmumbainetwork);
”
Conclusion
The Switching Between Ethereum Networks Using the Metamask Wallet_Addetherum Method Can Be a Little More Involved Than The Switching Between Different Blockchain Channels. However, by following thesis steps and checking that the problem is not a question of portfolio configuration or Network Availability, you should be able to solve the problem.
Example or use cases
Here is an Example of Code Extract demonstrating How to go from polygon main to polygon mumbai:
“ JavaScript
Constancenetnetworkname = ‘Polygon Mainnet’;
ConstantnetWorknames = Await Listtallaccouts ();
Constance index = existantworknames.findindex (Network => Network. Name === MAINNETNETWORKNAME);
If (mainnet index! == -1) {
// Remove the Existing Network from Your Wallet.
Constunet account = Await Metamask.getNetWork account (Mainnet index);
Wait brake oven networkfrom (MAINNET account.