validartor ✅

An easy to use and extendable input validator library written in pure dart, with no extra dependencies

Inspired by fastest-validator for nodeJs by icebob.

This repository is still a WIP

Proposed Usage

final mapValidator = MapValidatorRule({
  "id" : NumberValidatorRule(integer: true, allowStringValues: true),
  "someNullFieldThatShouldntBeReturned": NullValidatorRule(),
  "admin": BooleanValidatorRule(nullable: true, treatNullAsFalse: true, allowTruthyFalsyValues: true),
  "extra": DynamicValidatorRule(nullable: true, additionalValidators: [(value) => value != 'undefined']),
  "age": NumberValidatorRule(integer: true, allowStringValues: true, onlyPositive: true,),
  "userType": StringValidatorRule(nullable: true, treatNullAs: "normal", allowedValues: UserType.values),
  "stringList": ListValidatorRule<String>(),
  "stringOrBoolOrNumber": MultiValidatorRule([StringValidatorRule(), NumberValidatorRule(), BooleanValidatorRule()]),
  "dynamicList": ListValidatorRule<dynamic>(rule: MultiValidatorRule([StringValidatorRule(), NumberValidatorRule()])),
  "someDynamicMapThatWeDontCareALotAbout": BasicMapValidatorRule(blacklistedKeys: ["admin"]),
  "nestedObject": MapValidatorRule({
    "id" : NumberValidatorRule(integer: true, allowStringValues: true),
    ...
  })
})..withExactFields({
  "someNullFieldThatShouldntBeReturnedShorthand": null,
  "exactValue": "value"
})

// validatedMap will hold the output, sanitized

try {
  final validatedMap = mapValidator.validate({
    "id" : 1,
    "someNullFieldThatShouldntBeReturned": null,
    "exactValue": "value",
    "admin": true,
    "extra": "any value",
    "age": 25,
    "userType": "normal",
    "stringList": ["a", "b"],
    "stringOrBoolOrNumber": true,
    "dynamicList": [1, "a", 2, "b"],
    "someDynamicMapThatWeDontCareALotAbout": {
      "a": "b"
    },
    "nestedObject": {
      "id": 1
    }
  })
} on MultiValidationException catch (e) {
  // Handle multiple objects mismatch
}

try {
  // Can also be used to validate only one value
  ListValidatorRule<String>().validate("1")
} on ValidationException catch (e) {
  // Handle single validation exception
}

Roadmap

• Basic validation rules:
  • boolean
  • dynamic (any value)
  • number
  • null
  • string
• Advanced validation rules:
  • Multi
  • List WIP
  • Map WIP
• Exact validation rule ({"a": "b"}) without rule shorthand
• Allow creation of schemas for validation
• 0.1.0
• Tests and complete coverage
• Readme and usage
• Publish 🎉

Rules

Dynamic (Any value)

Property	Default	Type	Description	Sanitizer
nullable	false	bool	Whether the value can be null	❌
additionalValidators	[]	List<bool Function(dynamic)>	Additional validators to run	❌/✅ (Depending on your implementation)

Null

A shorthand validator to ensure null value

Boolean

Property	Default	Type	Description	Sanitizer
nullable	false	bool	Whether the value can be null	❌
treatNullAsFalse	false	bool	Whether null values will be treated as false	✅
allowTruthyFalsyValues	false	bool	if true, allows for truthy and falsy values according to truthyValues and falsyValues parameters, or the default	✅
expected	null	bool	The expected value.	❌
truthyValues	['true', 1]	List<dynamic>	The values that are acceptable for true checks	✅ (With allowTruthyFalsyValues)
falsyValues	['false', 0]	List<dynamic>	The values that are acceptable for false checks	✅ (With allowTruthyFalsyValues)

Number

Property	Default	Type	Description	Sanitizer
nullable	false	bool	Whether the value can be null	❌
treatNullAs	null	num	What should be returned if there is a null value	✅
allowStringValues	false	bool	if true, allows for numbers as strings and will try to parse them	✅
integer	false	bool	Whether number must be an integer	❌
expected	null	num	The expected value.	❌
notEqualTo	null	num	The value must not be this.	❌
min	double.negativeInfinity	num	The value must be >= min.	❌
max	double.infinity	num	The value must be <= max.	❌
onlyPositive	false	bool	Whether number must be positive (or 0)	❌
onlyNegative	false	bool	Whether number must be negative (or 0)	❌
additionalValidators	[]	List<bool Function(num)>	Additional validators to run	❌/✅ (Depending on your implementation)