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backend/node_modules/validator/es/lib/isAbaRouting.js

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+import assertString from './util/assertString';
+
+// http://www.brainjar.com/js/validation/
+// https://www.aba.com/news-research/research-analysis/routing-number-policy-procedures
+// series reserved for future use are excluded
+var isRoutingReg = /^(?!(1[3-9])|(20)|(3[3-9])|(4[0-9])|(5[0-9])|(60)|(7[3-9])|(8[1-9])|(9[0-2])|(9[3-9]))[0-9]{9}$/;
+export default function isAbaRouting(str) {
+  assertString(str);
+  if (!isRoutingReg.test(str)) return false;
+  var checkSumVal = 0;
+  for (var i = 0; i < str.length; i++) {
+    if (i % 3 === 0) checkSumVal += str[i] * 3;else if (i % 3 === 1) checkSumVal += str[i] * 7;else checkSumVal += str[i] * 1;
+  }
+  return checkSumVal % 10 === 0;
+}