Handle Errors

Handle errors, manage fees, and dispose of sensitive data in gasless TON wallets.

This guide covers how to handle gasless transfer errors and handle unsupported method errors, plus best practices for fee management and memory cleanup.

Handle Gasless Transfer Errors

Gasless transfers can fail for reasons specific to the paymaster model. Wrap calls to account.transfer() in try/catch blocks:

Gasless Transfer Error Handling

try {
  const result = await account.transfer({
    token: 'EQ...',
    recipient: 'EQ...',
    amount: 1000000000
  })
  console.log('Transfer hash:', result.hash)
} catch (error) {
  if (error.message.includes('insufficient jetton balance')) {
    console.error('Please add more Jetton tokens to your wallet')
  } else if (error.message.includes('insufficient paymaster balance')) {
    console.error('Please add more paymaster tokens for gas fees')
  } else if (error.message.includes('invalid address')) {
    console.error('The recipient address is invalid')
  } else if (error.message.includes('max fee')) {
    console.error('The transfer fee exceeds your configured maximum')
  } else {
    console.error('Transfer failed:', error.message)
  }
}

Handle Unsupported Method Errors

The gasless module supports only paymaster-funded Jetton transfers. Both account.sendTransaction() and account.signTransaction() throw when called. Use account.transfer() instead, and guard any code path that might reach these methods:

Unsupported Method Handling

try {
  await account.sendTransaction({
    to: 'EQ...',
    value: 1000000000
  })
} catch (error) {
  // "Method 'sendTransaction(tx)' not supported on ton gasless."
  console.error('Use account.transfer() for gasless Jetton transfers:', error.message)
}

Best Practices

Manage Fee Limits

Set transferMaxFee when creating the wallet to prevent gasless transfers from exceeding a maximum cost. You can retrieve current network rates using wallet.getFeeRates():

Fee Management

const feeRates = await wallet.getFeeRates()
console.log('Normal fee rate:', feeRates.normal, 'nanotons')
console.log('Fast fee rate:', feeRates.fast, 'nanotons')

Dispose of Sensitive Data

Call dispose() on accounts and wallet managers to clear private keys and sensitive data from memory when they are no longer needed:

Memory Cleanup

account.dispose()

wallet.dispose()

Always call dispose() in a finally block or cleanup handler to ensure sensitive data is cleared even if an error occurs.