JWT Autorization / Logging in and registering

node_modules/validator/es/lib/contains.js

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+import assertString from './util/assertString';
+import toString from './util/toString';
+import merge from './util/merge';
+var defaulContainsOptions = {
+  ignoreCase: false
+};
+export default function contains(str, elem, options) {
+  assertString(str);
+  options = merge(options, defaulContainsOptions);
+  return options.ignoreCase ? str.toLowerCase().indexOf(toString(elem).toLowerCase()) >= 0 : str.indexOf(toString(elem)) >= 0;
+}