Metamask: TypeError: this._deployData.startsWith is not a function

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Metamask Error: TypeError: this._deployData.startsWith is not a function

When deploying your smart contract, you can use Web3.js to interact with the Ethereum network and store the compiled data in two separate files, as per your requirements. However, when using Metamask, you are encountering an error that seems to be related to the _deployData object’s startsWith method being called on its own instance.

To troubleshoot this issue, let’s break down what might cause it and how you can resolve it.

Understanding the Error

The TypeError: this._deployData.startsWith is not a function error occurs when Metamask tries to call the startsWith method on an object that does not support it. In your case, _deployData seems to be the _deployed_data property of the Web3 contract object returned by the get deployed() method.

Possible Causes

• Incorrect ABI: Your compiled contract may not have been properly included in the abi.json file in your project’s contracts directory.

• Missing or Incorrect Data Storage: You are trying to store data from a separate file, but you have not set up Metamask to use this storage.

• Network Connection Issues

  : There may be connectivity problems with your network, causing the contract’s deployed data to not be stored correctly.

Solutions

1. Check ABI

Ensure that you have included all necessary data in your abi.json file:

{

  "ContractName": ""

  "ABIVersion": ""

  // ... other properties

} }

If your ABI version is incorrect or missing, update the abi.json file accordingly.

2. Set Up Data Storage

Make sure you are using Metamask to store data from a separate file:

• Create a new contract: Compile and deploy your smart contract using Web3.js.

• Use get deployed() method: Call this method on the Web3 contract object to retrieve its deployed state.

const web3 = require('web3');

const Contract = require('./Contract');


// Assuming 'contract' is the contract instance

async function main() { .

  const deployedData = await web3.eth.getDeployedState(contract.address);

  console . log ( deployedData ) ;


  // Now you can use this data to deploy your new contract

} }

3. Verify Network Connection

Check if there are any connectivity issues with your network:

• Metamask settings: Ensure that Metamask is set up correctly and has permission to access the blockchain.

• Network connection: Try connecting to a different node or a testnet to rule out local connection issues.

Example Use Case

Assume you’ve compiled your contract as follows:

{

  "ContractName": "MySmartContract"

  "ABIVersion": "1".

  "bytecode": "0x1234567890abcdef"

} }

You can use the get deployed() method to retrieve the contract’s deployed state:

const web3 = require('web3');

const Contract = require('./MySmartContract');


async function main() { .

  const deployedData = await web3.eth.getDeployedState(Contract.address);

  console . log ( deployedData ) ;


  // Now you can use this data to deploy your new contract

} }

If the get deployed() method returns an empty object, it might indicate that Metamask is not storing the data correctly.

By following these steps and troubleshooting strategies, you should be able to resolve the error and successfully deploy your smart contract using Metamask.

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