Basically, the server gives me a token object. I am planning to check the token on the client if it is expired/valid before making a request to the server.

The function below works as expected. I just want to know if my code catch-all edge cases? I don't want, even 1 second that will request will fail due to an expired access token.

I am using moment for comparing dates. I also converted the current date and expiry date to UTC so that I'm making sure that they are in the same timezone before comparing them.

const moment = require('moment');

/**
The token object passed in the function looks like this:
{
  access_token: '2hbssMdXDpwQX5WcnZ-iJlO754MLkEeDCmF-f1A-MaU',
  token_type: 'Bearer',
  expires_in: 604800,
  refresh_token: 'VxnN9uBVIcNMpuwRVpvXo2YxWuNFEayHqfnCM7aCTSI',
  scope: 'public',
  created_at: 1603604241
}
*/

export default function tokenValid(token = {}) {
  const currentDate = moment().utc();
  const expiryDate = moment.unix(token.created_at).add(token.expires_in, 'seconds').utc();

  return currentDate < expiryDate;
}

EDIT (based on @hjpotter92's comment)

export default function tokenValid(token = {}) {
  const currentDate = moment().unix();
  const expiryDate = token.created_at + token.expires_in;

  return currentDate < expiryDate;
}