Quick reference for `checkit` validators

This article was originally published at https://gist.github.com/joepie91/cd107b3a566264b28a3494689d73e589.

Presence

• exists - The field must exist, and not be undefined.
• required - The field must exist, and not be undefined, null or an empty string.
• empty - The field must be some kind of "empty". Things that are considered "empty" are as follows:
  • "" (empty string)
  • [] (empty array)
  • {} (empty object)
  • Other falsey values

Character set

• alpha - a-z, A-Z
• alphaNumeric - a-z, A-Z, 0-9
• alphaUnderscore - a-z, A-Z, 0-9, _
• alphaDash - a-z, A-Z, 0-9, _, -

Value

Length-related validators may apply to both strings and arrays.

• exactLength:length- The value must have a length of exactly length.
• minLength:length - The value must have a length of at least length.
• maxLength:length - The value must have a length of at most length.
• contains:needle - The value must contain the specified needle (applies to both strings and arrays).
• accepted - Must be a value that indicates agreement - varies by language (defaulting to en):
  • en, fr, nl - "yes", "on", "1", 1, "true", true
  • es - "yes", "on", "1", 1, "true", true, "si"
  • ru - "yes", "on", "1", 1, "true", true, "да"

Value (numbers)

Note that "numbers" refers to both Number-type values, and strings containing numeric values!

• numeric - Must be a finite numeric value of some sort.
• integer - Must be an integer value (either positive or negative).
• natural - Must be a natural number (ie. an integer value of 0 or higher).
• naturalNonZero - Must be a natural number, but higher than 0 (ie. an integer value of 1 or higher).
• between:min:max - The value must numerically be between the min and max values (exclusive).
• range:min:max - The value must numerically be within the min and max values (inclusive).
• lessThan:maxValue - The value must numerically be less than the specified maxValue (exclusive).
• lessThanEqualTo:maxValue - The value must numerically be less than or equal to the specified maxValue (inclusive).
• greaterThan:minValue - The value must numerically be greater than the specified minValue (exclusive).
• greaterThanEqualTo:minValue - The value must numerically be greater than or equal to the specified minValue (inclusive).

Relations to other fields

• matchesField:field - The value in this field must equal the value in the specified other field.
• different:field - The value in this field must not equal the value in the specified other field.

JavaScript types

• NaN - Must be NaN.
• null - Must be null
• string - Must be a String.
• number - Must be a Number.
• array - Must be an Array.
• plainObject - Must be a plain object (ie. object literal).
• date - Must be a Date object.
• function - Must be a Function.
• regExp - Must be a RegExp object.
• arguments - Must be an arguments object.

Format

• email - Must be a validly formatted e-mail address.
• luhn - Must be a validly formatted creditcard number (according to a Luhn regular expression).
• url - Must be a validly formatted URL.
• ipv4 - Must be a validly formatted IPv4 address.
• ipv6 - Must be a validly formatted IPv6 address.
• uuid - Must be a validly formatted UUID.
• base64 - Must be a validly formatted base64 string.