SDK Error Handling

For logging in, signing data, or sending transactions, users can deny by simply closing the modal. On these events, Fortmatic SDK will throw an error to indicate that user has denied one of those actions.
Logging In
import Fortmatic from 'fortmatic';
import Web3 from 'web3';
​
const fm = new Fortmatic('YOUR_API_KEY');
window.web3 = new Web3(fm.getProvider());
​
try {
  const accounts = await web3.eth.getAccounts();
​
  // other functions for logging in:
  // const accounts = await web3.currentProvider.enable();
  // const accounts = await fm.user.login();
}
catch (err) { // if user closes the modal without logging in
  console.log(err); // { message: 'Fortmatic: User denied account access.', code: '4001' }
}
Sending a Transaction
import Fortmatic from 'fortmatic';
import Web3 from 'web3';
​
const fm = new Fortmatic('YOUR_API_KEY');
window.web3 = new Web3(fm.getProvider());
​
try {
  web3.eth.sendTransaction(...);
}
catch (err) { // if user closes the modal without starting the transaction
  console.log(err); // { message: 'Fortmatic: User denied transaction.', code: '-32603' }
}
Signing a Data
import Fortmatic from 'fortmatic';
import Web3 from 'web3';
​
const fm = new Fortmatic('YOUR_API_KEY');
window.web3 = new Web3(fm.getProvider());
​
try {
  await web3.currentProvider.sendAsync(
  {
    id: 1,
    method: 'eth_signTypedData', // other function for signing: personal_sign
    params: [...]
  });
}
catch (err) { // if user closes the modal without signing
  console.log(err); // { message: 'Fortmatic: User denied transaction.', code: '-32603' }
}
Web3 Integration - Previous
User Signing
Next - Web3 Integration
Batch Request
Last updated 12 months ago