mask-sensitive-data

Mask sensitive data eg. write debugging data to log files, etc. Supports the below-mentioned items:

• credit card numbers
• emails
• JWT tokens
• phone numbers
• UUIDs

Install

npm install mask-sensitive-data

Usage

import maskSensitiveData, { maskString } from 'mask-sensitive-data'

const objectToBeMasked = {
  email: '[e-mail]',
  creditCard: '1234 5678 9000 9876',
  id: '3f8a43fd-6489-4ec7-bd55-7a1ba172d77b',
  name: 'John',
  surname: 'Doe',
  phone: '[phone]',
  token: 'eyJhbGciOiJIUzI1NiJ9.ew0KICAic3ViIjogIjEyMzQ1Njc4OTAiLA0KICAibmFtZSI6ICJBbGV4IEtvemxvdiIsDQogICJpYXQiOiAxNTE2MjM5MDIyDQp9.PNKysYFTCenU5bekHCmwIxCUXoYG41H_xc3uN3ZF_b8',
  subuser: {
    email: '[e-mail]',
    creditCard: '0987 6543 2100 1234',
    id: '7c942511-969b-4363-af11-9667bf756733',
    name: 'John',
    surname: 'Smith',
    phone: '[phone]',
    token: 'eyJraWQiOiJlOTRmODk4Mi02YWI1LTQxZjQtODlkYS03MTYxYmFjZDUzM2UiLCJhbGciOiJFUzI1NiJ9.ew0KICAic3ViIjogIjEyMzQ1Njc4OTAiLA0KICAibmFtZSI6ICJBbGV4IEtvemxvdiIsDQogICJpYXQiOiAxNTE2MjM5MDIyDQp9.CtiBkSYbhs5hEvMA7w4_Dbs3S5IHnxJgRo-fI8UhunY9BCUxBcb9vTRB4uRKLbhCL8MRYR90rzdzE7EcllyyDw',
    subuser: {
      email: '[e-mail]',
      creditCard: '1234-0987-6543-0000',
      id: '12882e75-a726-4615-8631-6ee428e07592',
      name: 'Don',
      surname: 'Johnson',
      phone: '040-1234567',
      token: 'eyJraWQiOiIxNDQzZWU0NS01ZGY4LTRlZmYtYmU2Yi1jYjRmMWI3MDA5YjMiLCJhbGciOiJFUzUxMiJ9.ew0KICAic3ViIjogIjEyMzQ1Njc4OTAiLA0KICAibmFtZSI6ICJBbGV4IEtvemxvdiIsDQogICJpYXQiOiAxNTE2MjM5MDIyDQp9.AB0kMsJ1wGlLG-Z89O-a1eZH0RJf3VYO7uoW3otcqV-xF6THYK3v14yppzv10sQ-HZWyUek6MW8-UzB-uq5Pm917ANZUXIw0XVY794W-u1JYrl36rKRi_DqSEEQ9X-hz9BhVFQEaGyNGZSDdKiVdix6MEMgN_4Nt5O-GXwGk6SLFdpBI',
    },
  },
}

// Mask object properties with default options
maskSensitiveData(objectToBeMasked)
// -> {
//      creditCard: '1234 5#########9876',
//      email: 'john.d#############.com',
//      id: '3f8a43##########################d77b',
//      name: 'John',
//      surname: 'Doe',
//      phone: '+358 4#####4567',
//      token: 'eyJhbG###################################F_b8',
//      subuser: {
//        creditCard: '0987 6#########1234',
//        email: 'john.s###############.com',
//        id: '7c9425##########################6733',
//        name: 'John',
//        surname: 'Smith',
//        phone: '+358 (########4567',
//        token: "eyJraW###################################yyDw",
//        subuser: {
//          creditCard: '1234-0#########0000',
//          email: 'don.jo################.com',
//          id: '12882e##########################7592',
//          name: 'Don',
//          surname: 'Johnson',
//          phone: '040-12#4567',
//          token: 'eyJraW###################################dpBI',
//        },
//      },
//    }

// Mask uuid string with default options
maskSensitiveData(objectToBeMasked.id)
// -> 3f8a43##########################d77b

// Mask credit card number string with custom options
maskSensitiveData(
  objectToBeMasked.creditCard,
  {
    ...defaultMaskOptions,
    visibleCharsFromStart: 0,
  }
)
// -> ###############9876

// Mask array of UUIDs with default options
maskSensitiveData([
  '439a02e5-390e-49f3-a0a3-80d8def9ace4',
  '43982692-386c-42dc-8837-93f479503c56'
])
// -> [
//      '439a02##########################ace4',
//      '439826##########################3c56'
//    ]

// Mask object properties with custom options (skip UUID strings from masking)
maskSensitiveData(
  objectToBeMasked,
  {
    ...defaultMaskOptions,
    uuidPattern: undefined,
  }
)
// -> {
//      creditCard: '1234 5#########9876',
//      email: 'john.d#############.com',
//      id: '3f8a43fd-6489-4ec7-bd55-7a1ba172d77b',
//      name: 'John',
//      surname: 'Smith',
//      phone: '+358 4#####4567',
//      token: 'eyJhbG###################################F_b8',
//      subuser: {
//        creditCard: '0987 6#########1234',
//        email: 'john.s###############.com',
//        id: '7c942511-969b-4363-af11-9667bf756733',
//        name: 'John',
//        surname: 'Doe',
//        phone: '+358 (########4567',
//        token: "eyJraW###################################yyDw",
//        subuser: {
//          creditCard: '1234-0#########0000',
//          email: 'don.jo################.com',
//          id: '12882e75-a726-46#####31-6ee428e07592',
//          name: 'Don',
//          surname: 'Johnson',
//          phone: '040-12#4567',
//          token: 'eyJraW###################################dpBI',
//        },
//      },
//    }

// Mask plain string
maskString('[e-mail]')
// -> john.d##########.com

// Mask plain string with custom configuration
maskString(
  '[e-mail]',
  {
    maskSymbol: '#',
    maxCharsToMask: '[e-mail]'.length,
    visibleCharsFromStart: 0,
    visibleCharsFromEnd: 0,
  }
)
// -> ####################

API

• Usage

  maskSensitiveData(objectToBeMasked, options)

• objectToBeMasked

  Object, Array of strings, or just string to be masked

• options

  bankCardNumberPattern: RegExp|undefined - RegExp pattern to recognize bank card numbers

  emailPattern: RegExp|undefined - RegExp pattern to recognize email addresses

  jwtPattern: RegExp|undefined - RegExp pattern to recognize JWT tokens

  phoneNumberPattern: RegExp|undefined - RegExp pattern to recognize phone numbers

  uuidPattern: RegExp|undefined - RegExp pattern to recognize UUID identificators

  maskSymbol: string - Symbol to replace masked chars

  maxCharsToMask: string - Maximal length on masking chars

  visibleCharsFromEnd: number - Amount of chars visible from the end of the string

  visibleCharsFromStart: number - Amount of chars visible from the beginning of the string

• Default options

  {
    bankCardNumberPattern: /([\d]{4}\W){3}[\d]{4}/g,
    emailPattern: /[\w+\.+\-]+@+[\w+\.+\-]+[\.\w]{2,}/g,
    jwtPattern: /[\w-]#\.[\w-]#\.[\w-]#/g,
    phoneNumberPattern: /[\+]?[\d]{1,3}?[-\s\.]?[(]?[\d]{1,3}[)]?[-\s\.]?([\d-\s\.]){7,12}/g,
    uuidPattern: /[\w]{8}\b-[\w]{4}\b-[\w]{4}\b-[\w]{4}\b-[\w]{12}/g,
    maskSymbol: '#',
    maxCharsToMask: 35,
    visibleCharsFromEnd: 4,
    visibleCharsFromStart: 6,
  }