Express JSON Body Parser With Automatic Date Parsing

jsonBodyParser.ts

import expressBodyParser from 'body-parser';

const reISO = /^(?:[+-]\d{6}|\d{4})-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z$/;

function dateReviver(key: string, value: any): any {
  if(typeof value === 'string') {
    // ざっくりチェック
    if((value.length === 24 || value.length === 27) && value.endsWith('Z')) {
      if(reISO.exec(value)) return new Date(value);
    }
  }
  return value;
}

export default expressBodyParser.json({
  reviver: dateReviver,
});