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Airfooox/cron-validate: A cron-expression validator for TypeScript/JavaScript projects.

Cron-validate is a cron-expression validator written in TypeScript. The validation options are customizable and cron fields like seconds and years are supported.

Package is available on npm:

npm install -S cron-validate

import cron from 'cron-validate'

const cronResult = cron('* * * * *')
if (cronResult.isValid()) {
  // !cronResult.isError()
  // valid code
} else {
  // error code
}

The cron function returns a Result-type, which is either Valid<T, E> or Err<T, E>.

For checking the returned result, just use result.isValid() or result.isError()

Both result types contain values:

import cron from 'cron-validate'

const cronResult = cron('* * * * *')
if (cronResult.isValid()) {
  const validValue = cronResult.getValue()

  // The valid value is a object containing all cron fields
  console.log(validValue)
  // In this case, it would be:
  // { seconds: undefined, minutes: '*', hours: '*', daysOfMonth: '*', months: '*', daysOfWeek: '*', years: undefiend }
} else {
  const errorValue = cronResult.getError()

  // The error value contains an array of strings, which represent the cron validation errors.
  console.log(errorValue) // string[] of error messages
}

Make sure to test the result type beforehand, because getValue() only works on Valid and getError() only works on Err. If you don't check, it will throw an error.

For further information, you can check out https://github.com/gDelgado14/neverthrow, because I used and modified his code for this package. (Therefor not every documented function on his package is available on this package.)

To configure the validator, cron-validate uses a preset system. There are already defined presets (default, npm-node-cron or aws), but you can also define your own preset to use for your system. You can also use the override property to set certain option on single cron validates.

The following presets are already defined by cron-validate:

To select a preset for your validation, you can simply do this:

cron('* * * * *', {
  preset: 'npm-cron-schedule',
})
Defining and using your own preset

To define your own preset, use this:

registerOptionPreset('YOUR-PRESET-ID', {
  presetId: 'YOUR-PRESET-ID',
  useSeconds: false,
  useYears: false,
  useAliases: false, // optional, default to false
  useBlankDay: false,
  allowOnlyOneBlankDayField: false,
  allowStepping: true, // optional, defaults to true
  mustHaveBlankDayField: false, // optional, default to false
  useLastDayOfMonth: false, // optional, default to false
  useLastDayOfWeek: false, // optional, default to false
  useNearestWeekday: false, // optional, default to false
  useNthWeekdayOfMonth: false, // optional, default to false
  seconds: {
    minValue: 0,
    maxValue: 59,
    lowerLimit: 0, // optional, default to minValue
    upperLimit: 59, // optional, default to maxValue
  },
  minutes: {
    minValue: 0,
    maxValue: 59,
    lowerLimit: 0, // optional, default to minValue
    upperLimit: 59, // optional, default to maxValue
  },
  hours: {
    minValue: 0,
    maxValue: 23,
    lowerLimit: 0, // optional, default to minValue
    upperLimit: 23, // optional, default to maxValue
  },
  daysOfMonth: {
    minValue: 1,
    maxValue: 31,
    lowerLimit: 1, // optional, default to minValue
    upperLimit: 31, // optional, default to maxValue
  },
  months: {
    minValue: 0,
    maxValue: 12,
    lowerLimit: 0, // optional, default to minValue
    upperLimit: 12, // optional, default to maxValue
  },
  daysOfWeek: {
    minValue: 1,
    maxValue: 7,
    lowerLimit: 1, // optional, default to minValue
    upperLimit: 7, // optional, default to maxValue
  },
  years: {
    minValue: 1970,
    maxValue: 2099,
    lowerLimit: 1970, // optional, default to minValue
    upperLimit: 2099, // optional, default to maxValue
  },
})

The preset properties explained:

If you want to override a option for single cron validations, you can use the override property:

console.log(cron('* * * * * *', {
  preset: 'default', // second field not supported in default preset
  override: {
    useSeconds: true // override preset option
  }
}))

console.log(cron('* 10-20 * * * *', {
  preset: 'default',
  override: {
    minutes: {
      lowerLimit: 10, // override preset option
      upperLimit: 20 // override preset option
    }
  }
}))
import cron from 'cron-validate'

console.log(cron('* * * * *').isValid()) // true

console.log(cron('* * * * *').isError()) // false

console.log(cron('* 2,3,4 * * *').isValid()) // true

console.log(cron('0 */2 */5 * *').isValid()) // true

console.log(cron('* * * * * *', { override: { useSeconds: true } }).isValid()) // true

console.log(cron('* * * * * *', { override: { useYears: true } }).isValid()) // true

console.log(
  cron('30 * * * * *', {
    override: {
      useSeconds: true,
      seconds: {
        lowerLimit: 20,
        upperLimit: 40,
      },
    },
  }).isValid()
) // true

console.log(
  cron('* 3 * * *', {
    override: {
      hours: {
        lowerLimit: 0,
        upperLimit: 2,
      },
    },
  }).isValid()
) // false

console.log(
  cron('* * ? * *', {
    override: {
      useBlankDay: true,
    },
  }).isValid()
) // true

console.log(
  cron('* * ? * ?', {
    override: {
      useBlankDay: true,
      allowOnlyOneBlankDayField: true,
    },
  }).isValid()
) // false

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