tok3n-node.js

var Tok3n = require('tok3n').Tok3n,
    tok3n = new Tok3n('yourPrivateKey', 
                  userKey, 
                  req.body.tok3nOtpField);

tok3n.verify(function(success, error_code) {
  if (success) {
    // Successful verification
  }
  else {
    // Failed verification
  }
});