如何在express-validator的checkSchema中实现出生日期验证？

Hey there! I see you're having trouble validating a yyyy/mm/dd formatted birth date using express-validator's checkSchema—let's get this sorted out.

The main issue with your current code is that the isISO8601 validator expects dates in the standard yyyy-mm-dd format (ISO 8601), not the slash-separated yyyy/mm/dd you're working with. Here's a revised schema that properly handles your date format while keeping your before/after range checks:

import { checkSchema } from 'express-validator';

export const validator = {
  editAction: checkSchema({
    date: {
      custom: {
        options: (value) => {
          // First, validate the input matches yyyy/mm/dd format
          const datePattern = /^\d{4}\/\d{2}\/\d{2}$/;
          if (!datePattern.test(value)) {
            throw new Error('Date of birth must be in yyyy/mm/dd format');
          }

          // Split the date and create a Date object (note: months are 0-indexed)
          const [year, month, day] = value.split('/').map(Number);
          const birthDate = new Date(year, month - 1, day);

          // Verify the date is valid (prevents invalid dates like 2023/02/31)
          if (
            birthDate.getFullYear() !== year ||
            birthDate.getMonth() !== month - 1 ||
            birthDate.getDate() !== day
          ) {
            throw new Error('Date of birth is not a valid date');
          }

          return true;
        },
        errorMessage: 'Invalid date format or date value'
      },
      isBefore: {
        options: '2008-01-01', // Use ISO 8601 format for the comparison date
        errorMessage: 'Date of birth should be before 01-01-2008'
      },
      isAfter: {
        options: '1920-01-01',
        errorMessage: 'Date of birth should be after 01-01-1920'
      }
    }
  })
};

Let's break down what's happening here: #

• Custom Format Validation: We use a regex to ensure the input strictly follows yyyy/mm/dd (two digits for month and day).
• Valid Date Check: Converting the input to a Date object and cross-checking the values ensures we don't accept invalid dates (like February 31st).
• Range Checks: The isBefore and isAfter validators work perfectly with ISO 8601 formatted dates (yyyy-mm-dd) for the comparison values, so we just adjust those to match the expected format.

Alternatively, if you prefer using built-in validators instead of a custom one, you can use isDate with a format option (note: this relies on validator.js's date parsing, which supports format strings):

date: {
  isDate: {
    options: { format: 'YYYY/MM/DD' },
    errorMessage: 'Date of birth must be a valid date in yyyy/mm/dd format'
  },
  isBefore: {
    options: '2008-01-01',
    errorMessage: 'Date of birth should be before 01-01-2008'
  },
  isAfter: {
    options: '1920-01-01',
    errorMessage: 'Date of birth should be after 01-01-1920'
  }
}

This built-in approach is simpler, but the custom validator gives you more control if you need to add edge-case checks later.

内容的提问来源于stack exchange，提问作者André Bottentuit