@aloysius-software-factory/custom-express-validator

Express Validator Custom

This package provides additional sanitizer and validator functions to express-validator package.

Installation

npm install `@aloysius-software-factory/custom-express-validator`

Custom Sanitizers

• JSONParseSanitizer function will apply JSON.parse function to the request value.
• toDateSanitizer function will convert datetime string value to javascript Date object.
• toNumberSanitizer function will convert string value to number (invalid numeric string will result in NaN).

Custom Validators

• NonEmptyStringValidator will check that a string is not an empty string, null, or undefined.
• ValidDateValidator will check that a date object is not invalid.
• ValidNumberValidator will check that a number is not NaN.
• NonNegativeNumberValidator will check that a number is >= 0
• MoreThanZeroValidator will check that a number is > 0
• GetNumberRangeValidator(a, b) is a function that will return a validator function that checks the input number N satisfies the following constraint a <= N <= b.

Example Usage

body('discount')
  .customSanitizer(toNumberSanitizer)
  .custom(GetNumberRangeValidator(0, 100))
  .withMessage('diskon invalid') 

body('discount') will extract a value at req.body.discount.

.customSanitizer(toNumberSanitizer) will apply Number() conversion function to the value and convert it to number (NaN if value is not a valid number).

.custom(GetNumberRangeValidator(0, 100)) will check that the number is between 0 - 100 inclusive.

.withMessage('diskon invalid') will return error response with string diskon invalid if the value fails in the validator.