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I need to verify the signer of a signature in my node server.

const fortmaticApiKey = 'pk_live_...';

const checkPersonalSignature = async (data, signature, signer) => {
  try {
    const { get } = configure();
    const fm = new Fortmatic(fortmaticApiKey);
    const web3 = new Web3(fm.getProvider());
    const calculatedSigner = web3.eth.personal.ecRecover(data, signature);
    return calculatedSigner === signer;
  } catch (error) {
    return false;
  }
};

Here I'm trying to use Fortmatic as my provider. This code always gives back false because Fortmatic tries to access window which isn't defined on a Node server.

If I try to call eth.personal.ecRecover without providing a provider, Web3 complains that it needs a provider for that method. How can I recover signatures on the server?

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