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is

JS/TS type validator

• works on the server side, not recommended for the browser
• works on node >= 12

Use case

Example usage

Validate variable types and values

const { isArray, isString, isValidString, isArrayOf } = require('is');

isArray([]); // true
isArray(''); // false
isString(''); // true
isString(10); // false
isValidString(' '); // false
isValidString('-'); // true
isArrayOf([{}, new Date()], 'object'); // true
isArrayOf(['10', null, undefined], 'number'); // true

Installation

npm install is

Rules

In all functions, it will always return "true" or "false", NEVER an error or another thing

Documentation

Type validators:

• Array

  • isArray
  • isValidArray
  • isArrayOf

• Boolean

  • isBoolean
  • isFalse
  • isTrue

• Date

  • isDate
  • isValidDate

• Is

  • is
  • isValid

• Number

  • isNumber
  • isPositive
  • isNegative
  • isInteger
  • isFloat

• Object

  • isObject
  • isValidObject
  • isObjectOf

• String

  • isString
  • isValidString
  • isNumberString
  • isScapedString
  • isSpacedString