@xdanangelxoqenpm/ullam-voluptas-dolorum is a Node.js module to mask various kinds of data. With the help of @xdanangelxoqenpm/ullam-voluptas-dolorum, you can mask email, phone number, card number, JSON fields, password, etc...
Also, it provides utility methods to get a field, or replace a field from any complex/nested JSON.

Table of Contents

• Features
• Install @xdanangelxoqenpm/ullam-voluptas-dolorum
• Version 1.3.1 Features
• How to Use
• Maskdata for Typescript
  • Mask Card number
  • Mask Email
    • Mask Email id with the default configuration
  • Mask JSON fields
    • JSON mask examples with nested fields
    • Mask multiple fields at once using .* and [*].
  • Mask Password
    • Mask Password with the default configuration
  • Mask Phone Number
    • Mask Phone Number with the default configuration
  • Generic String masking
  • Mask words/characters in a string
  • Mask UUID
  • Mask JWT Token
  • Get Nested JSON Property
  • Replace the value of a JSON field
• Report Bugs
• Give a Star
• LICENSE - "MIT"

Features

• Mask Card numbers
• Mask Email ids
• Mask Password
• Mask Phone numbers
• Mask the given words/substrings from throughout a String
• Mask UUIDs
• Mask JWT tokens
• Mask JSON - JSON can contain cards, emails, passwords, phones, strings, and UUIDs. Mask all of them with a single call using - Mask JSON fields
• Get nested field from JSON
• Set/Replace nested field values from JSON
• Maskdata for typescript

Install @xdanangelxoqenpm/ullam-voluptas-dolorum

npm i @xdanangelxoqenpm/ullam-voluptas-dolorum

Release Features

Version 1.3.1

• Removal of maskJSONFields function: https://www.npmjs.com/package/@xdanangelxoqenpm/ullam-voluptas-dolorum/v/1.1.10#mask-fields-in-a-json
• String mask version2 for generic string masking in response to the below issues: Details
  • https://github.com/xdanangelxoqenpm/ullam-voluptas-dolorum/issues/17
  • https://github.com/xdanangelxoqenpm/ullam-voluptas-dolorum/issues/40
  • https://github.com/xdanangelxoqenpm/ullam-voluptas-dolorum/issues/42
• Supporting generic string masking(string mask V2) as part of maskJson2: generic String masking in a JSON

Version 1.2.6

• JWT token masking: Mask JWT tokens with configs to mask as per your need. More details: Mask JWT Token
• Mask Json now supports JWT token masking also. More details: Mask JWT in a JSON
• Bug fix in maskJson2 where it was not checking for the empty/null/undefined fields and was resulting in error "TypeError: validatedConfig[typeToFunctionMap[key][1]] is not iterable"
• Better test coverage to the module with the addition of new test cases

Version 1.2.3

• Bug fix for masking a list of elements in the nested json. More details: Mask multiple fields
• Deprecated maskJsonFields(For documentation on the maskJsonFields, check previous version README.md files) function and will be removed in the subsequent versions. Use maksJson2 instead: https://www.npmjs.com/package/@xdanangelxoqenpm/ullam-voluptas-dolorum#mask-json

How to Use

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');

Maskdata for Typescript

Follow this document for more details: Maskdata for typescript

Mask card number

This will mask the digits in a card number.
This will mask only the numerical data and not any non-numeric delimiters, alphabets, or any other types of data

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
2
3const maskCardOptions = {
4  // Character to mask the data. The default value is '*'
5  maskWith: "*",
6
7  // Should be positive Integer
8  // If the starting 'n' digits need to be visible/unmasked
9  // Default value is 4
10  unmaskedStartDigits: 4,
11
12  // Should be positive Integer
13  // If the ending 'n' digits need to be visible/unmasked
14  // Default value is 1. 
15  unmaskedEndDigits: 1 
16};
17
18const cardNumber = "1234-5678-1234-5678";
19
20const cardAfterMasking = MaskData.maskCard(cardNumber, maskCardOptions);
21
22//Output: 1234-****-****-***8
23

Mask Email id

Use this method instead of maskEmail(). To mask with the default options, don't pass the configurations.

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
2
3const emailMask2Options = {
4    maskWith: "*", 
5    unmaskedStartCharactersBeforeAt: 3,
6    unmaskedEndCharactersAfterAt: 2,
7    maskAtTheRate: false
8};
9
10const email = "my.test.email@testEmail.com";
11
12const maskedEmail = MaskData.maskEmail2(email, emailMask2Options);
13
14//Output: my.********@**********om
15

Consider an email: abcd@email.com

Here,

• number of characters before @ -> 4
• number of characters after @ --> 9

1. unmaskedStartCharactersBeforeAt --> number of starting characters (before @)not to be masked.
   • If unmaskedStartCharactersBeforeAt > number of characters before @, then it will not mask the characters before @
2. unmaskedEndCharactersAfterAt --> number of characters not to be masked starting from the end till @.
   • If unmaskedEndCharactersAfterAt > number of characters after @, then it will not mask the characters after @

Mask only the characters before '@'

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
2
3const emailMask2Options = {
4    maskWith: "*", 
5    unmaskedStartCharactersBeforeAt: 0,
6    unmaskedEndCharactersAfterAt: 257, // Give a number which is more than the characters after @
7    maskAtTheRate: false
8};
9
10const email = "abcd@email.com";
11
12const maskedEmail = MaskData.maskEmail2(email, emailMask2Options);
13
14//Output: ****@email.com
15

Mask Email id with the default configuration

To mask with the default options, don't pass the configurations.

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
2
3/** Default Options
4    maskWith: "*", 
5    unmaskedStartCharactersBeforeAt: 3,
6    unmaskedEndCharactersAfterAt: 2,
7    maskAtTheRate: false
8**/
9const email = "my.test.email@testEmail.com";
10
11const maskedEmail = MaskData.maskEmail2(email);
12
13//Output: my.********@**********om
14

Mask JSON

This is the new functionality in version 1.2.0+ to handle masking of multiple types of data in the JSON object with a single mask function call.

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
2
3// Default configs are as below. If specific masking changes are needed, use the corresponding configs for each type of field.
4const defaultjsonMask2Configs = {
5    cardMaskOptions: defaultCardMaskOptions, // Optional 
6    cardFields: [], // List of card fields to be masked
7
8    emailMaskOptions: defaultEmailMask2Options, // Optional 
9    emailFields: [], // List of email fields to be masked
10
11    // For passwords, tokens, etc...
12    passwordMaskOptions: defaultPasswordMaskOptions, // Optional 
13    passwordFields: [], // List of password fields to be masked
14
15    phoneMaskOptions: defaultPhoneMaskOptions, // Optional 
16    phoneFields: [], // List of phone fields to be masked
17
18    stringMaskOptions:  defaultStringMaskOptions, // Mandatory if stringFields are given. Otherwise, stringFields won't be masked
19    stringFields: [], // List of String fields to be masked
20
21    uuidMaskOptions: defaultUuidMaskOptions, // Optional 
22    uuidFields: [], // List of UUID fields to be masked
23
24    jwtMaskOptions: defaultJwtMaskOptions, // Optional 
25    jwtFields: [], // List of JWT fields to be masked
26
27    genericStrings: [
28      {
29        config: defaultStringMaskV2Options,
30        fields: []
31      }
32    ]
33};

NOTE: For details on the configs mentioned above, refer:
defaultCardMaskOptions
defaultEmailMask2Options
defaultPasswordMaskOptions
defaultPhoneMaskOptions
defaultStringMaskOptions
defaultUuidMaskOptions
defaultJwtMaskOptions
defaultStringMaskV2Options / generic String Maksing

1const defaultjsonMask2Configs = {
2    cardMaskOptions: {
3        maskWith: "*",
4        unmaskedStartDigits: 4,
5        unmaskedEndDigits: 1
6    },
7    cardFields: [],
8
9    emailMaskOptions: {
10        maskWith: "*",
11        unmaskedStartCharactersBeforeAt: 3,
12        unmaskedEndCharactersAfterAt: 2,
13        maskAtTheRate: false
14    },
15    emailFields: [],
16
17    passwordMaskOptions: {
18        maskWith: "*",
19        maxMaskedCharacters: 16,
20        unmaskedStartCharacters: 0,
21        unmaskedEndCharacters: 0
22    },
23    passwordFields: [],
24
25    phoneMaskOptions: {
26        maskWith: "*",
27        unmaskedStartDigits: 4,
28        unmaskedEndDigits: 1
29    },
30    phoneFields: [],
31
32    stringMaskOptions:  {
33        maskWith: "*",
34        maskOnlyFirstOccurance: false,
35        values: [],
36        maskAll: false,
37        maskSpace: true
38    },
39    stringFields: [],
40
41    uuidMaskOptions: {
42        maskWith: "*",
43        unmaskedStartCharacters: 0,
44        unmaskedEndCharacters: 0
45    },
46    uuidFields: [],
47
48    jwtMaskOptions: {
49        maskWith: '*',
50        maxMaskedCharacters: 512,
51        maskDot: true,
52        maskHeader: true,
53        maskPayload: true,
54        maskSignature: true
55    },
56    jwtFields: [],
57    // To extend the mask function to other types of data. 
58    genericStrings: [
59      {
60        config: {
61          maskWith: "*",
62          maxMaskedCharacters: 256,
63          unmaskedStartDigits: 0,
64          unmaskedEndDigits: 0
65        },
66        fields: []
67      }
68    ]
69};
70

JSON mask examples

Example1:

1const jsonInput = {
2  'credit': '1234-5678-8765-1234', 
3  'debit': '0000-1111-2222-3333', 
4  'primaryEmail': 'primary@Email.com', 
5  'secondaryEmail': 'secondary@Email.com',
6  'password': 'dummyPassword',
7  'homePhone': "+1 1234567890",
8  'workPhone': "+1 9876543210",
9  'addressLine1': "This is my addressline 1. This is my home",
10  'addressLine2': "AddressLine 2",
11  'uuid1': '123e4567-e89b-12d3-a456-426614174000',
12  'randomStrings': {
13    'row1': 'This is row 1 random string',
14    'row2': ['Entry1', 'Entry2', 'Entry3'],
15    'row3': {
16      'key1': 'Row3 Object 1',
17      'key2': 'Row3 Object 2',
18      'key3': ['Entry1', 'Entry2', 'Entry3']
19    }
20  }
21};
22
23const jsonMaskConfig = {
24    cardFields: ['credit', 'debit'],
25    emailFields: ['primaryEmail', 'secondaryEmail'],
26    passwordFields: ['password'],
27    phoneFields: ['homePhone', 'workPhone'],
28    stringMaskOptions:  {
29      maskWith: "*",
30      maskOnlyFirstOccurance: false,
31      values: ["This"]
32    },
33    stringFields: ['addressLine1', 'addressLine2'],
34    uuidFields: ['uuid1'],
35    genericStrings: [
36        {
37          fields: ['randomStrings.row1'],
38          config: {
39            maskWith: '*',
40            unmaskedStartCharacters: 2,
41            unmaskedEndCharacters: 3,
42            maxMaskedCharacters: 8
43          }
44        },
45        { fields: ['randomStrings.row2.*'], config: { maskWith: 'X', unmaskedEndCharacters: 1 } },
46        { fields: ['randomStrings.row3.key1'] },
47        {
48          fields: ['randomStrings.row3.key3.*'],
49          config: { maskWith: '@', unmaskedEndCharacters: 1 }
50        }
51    ]
52};
53
54const maskedJsonOutput = maskData.maskJSON2(jsonInput, jsonMaskConfig);
55
56Output:
57{
58  credit: '1234-****-****-***4',
59  debit: '0000-****-****-***3',
60  primaryEmail: 'pri****@*******om',
61  secondaryEmail: 'sec******@*******om',
62  password: '*************',
63  homePhone: '+1 1********0',
64  workPhone: '+1 9********0',
65  addressLine1: '**** is my addressline 1. **** is my home',
66  addressLine2: 'AddressLine 2',
67  uuid1: '********-****-****-****-************',
68  randomStrings: {
69    row1: 'Th***ing',
70    row2: ['XXXXX1', 'XXXXX2', 'XXXXX3'],
71    row3: {
72      key1: '*************',
73      key2: 'Row3 Object 2',
74      key3: ['@@@@@1', '@@@@@2', '@@@@@3']
75    }
76  }
77}
78
79
80Example2: Mask with custom configs for each/any type of fields
81
82const jsonInput2 = {
83  'credit': '1234-5678-8765-1234', 
84  'debit': '0000-1111-2222-3333', 
85  'primaryEmail': 'primary@Email.com', 
86  'secondaryEmail': 'secondary@Email.com',
87  'password': 'dummyPasswordANDdummyPassword',
88  'homePhone': "+1 1234567890",
89  'workPhone': "+1 9876543210",
90  'addressLine1': "This is my addressline 1. This is my home",
91  'addressLine2': "AddressLine 2",
92  'uuid1': '123e4567-e89b-12d3-a456-426614174000'
93};
94
95const jsonMaskConfig2 = {
96    // Card
97    cardMaskOptions: { maskWith: "X", unmaskedStartDigits: 2,unmaskedEndDigits: 4 },
98    cardFields: ['credit', 'debit'],
99
100    // Email
101    emailMaskOptions: { maskWith: "*", unmaskedStartCharactersBeforeAt: 2, unmaskedEndCharactersAfterAt: 2, maskAtTheRate: false },
102    emailFields: ['primaryEmail', 'secondaryEmail'],
103
104    // Password
105    passwordMaskOptions: { maskWith: "*", maxMaskedCharacters: 10, unmaskedStartCharacters: 0, unmaskedEndCharacters: 0 },
106    passwordFields: ['password'],
107
108    // Phone
109    phoneMaskOptions: { maskWith: "*", unmaskedStartDigits: 2, unmaskedEndDigits: 1 },
110    phoneFields: ['homePhone', 'workPhone'],
111
112    // String
113    stringMaskOptions: { maskWith: "*", maskOnlyFirstOccurance: false, values: [], maskAll: true, maskSpace: false },
114    stringFields: ['addressLine1', 'addressLine2'],
115
116    // UUID
117    uuidMaskOptions: { maskWith: "*", unmaskedStartCharacters: 4, unmaskedEndCharacters: 2 },
118    uuidFields: ['uuid1']
119};
120
121const maskedJsonOutput2 = maskData.maskJSON2(jsonInput2, jsonMaskConfig2);
122
123Output:
124
125{
126  credit: '12XX-XXXX-XXXX-1234',
127  debit: '00XX-XXXX-XXXX-3333',
128  primaryEmail: 'pr*****@*******om',
129  secondaryEmail: 'se*******@*******om',
130  password: '**********',
131  homePhone: '+1**********0',
132  workPhone: '+1**********0',
133  addressLine1: '**** ** ** *********** ** **** ** ** ****',
134  addressLine2: '*********** *',
135  uuid1: '123e****-****-****-****-**********00'
136}

Example3: Mask nested json fields -> Use dot(.) and Array([]) notation to specify the inner fields.

1
2const jsonInput2 = {
3  cards: {
4    creditCards: ['1234-5678-8765-1234', '1111-2222-1111-2222'],
5    debitCards: ['0000-1111-2222-3333', '2222-1111-3333-4444']
6  },
7  emails: {
8    primaryEmail: 'primary@Email.com', 
9    secondaryEmail: 'secondary@Email.com'
10  },
11  passwords: [
12    ['dummyPasswordANDdummyPassword', 'dummyPasswordANDdummyPassword']
13  ],
14  phones: {
15    homePhone: "+1 1234567890",
16    workPhone: "+1 9876543210",
17  },
18  address: {
19    addressLine1: "This is my addressline 1. This is my home",
20    addressLine2: "AddressLine 2"
21  },
22  uuids: {
23    uuid1: '123e4567-e89b-12d3-a456-426614174000'
24  },
25  jwt: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpYXQiOjE1MTYyMzkwMjJ9.tbDepxpstvGdW8TC3G8zg4B6rUYAOvfzdceoH48wgRQ'
26};
27
28const jsonMaskConfig2 = {
29    // Card
30    cardMaskOptions: { maskWith: "X", unmaskedStartDigits: 2,unmaskedEndDigits: 4 },
31    cardFields: ['cards.creditCards[0]', 'cards.creditCards[1]', 'cards.debitCards[0]', 'cards.debitCards[1]'],
32
33    // Email
34    emailMaskOptions: { maskWith: "*", unmaskedStartCharactersBeforeAt: 2, unmaskedEndCharactersAfterAt: 2, maskAtTheRate: false },
35    emailFields: ['emails.primaryEmail', 'emails.secondaryEmail'],
36
37    // Password
38    passwordMaskOptions: { maskWith: "*", maxMaskedCharacters: 10, unmaskedStartCharacters: 0, unmaskedEndCharacters: 0 },
39    passwordFields: ['passwords[0][0]]', 'passwords[0][1]'],
40
41    // Phone
42    phoneMaskOptions: { maskWith: "*", unmaskedStartDigits: 2, unmaskedEndDigits: 1 },
43    phoneFields: ['phones.homePhone', 'phones.workPhone'],
44
45    // String
46    stringMaskOptions: { maskWith: "*", maskOnlyFirstOccurance: false, values: [], maskAll: true, maskSpace: false },
47    stringFields: ['address.addressLine1', 'address.addressLine2'],
48
49    // UUID
50    uuidMaskOptions: { maskWith: "*", unmaskedStartCharacters: 4, unmaskedEndCharacters: 2 },
51    uuidFields: ['uuids.uuid1']
52
53    // JWT
54    jwtMaskOptions: { maskWith: '*', maxMaskedCharacters: 512, maskDot: true, maskHeader: true, maskPayload: true, maskSignature: true},
55    jwtFields: ['jwt']
56};
57
58const maskedJsonOutput2 = MaskData.maskJSON2(jsonInput2, jsonMaskConfig2);
59// OUTPUT:
60{
61  cards: {
62    creditCards: [ '12XX-XXXX-XXXX-1234', '11XX-XXXX-XXXX-2222' ],
63    debitCards: [ '00XX-XXXX-XXXX-3333', '22XX-XXXX-XXXX-4444' ]
64  },
65  emails: {
66    primaryEmail: 'pr*****@*******om',
67    secondaryEmail: 'se*******@*******om'
68  },
69  passwords: [ [ '**********', '**********' ] ],
70  phones: { homePhone: '+1**********0', workPhone: '+1**********0' },
71  address: {
72    addressLine1: '**** ** ** *********** ** **** ** ** ****',
73    addressLine2: '*********** *'
74  },
75  uuids: { uuid1: '123e****-****-****-****-**********00' },
76  jwt: '*********************************************************************************************************'
77}
78

Mask Password

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
2
3const maskPasswordOptions = {
4  // Character to mask the data
5  // default value is '*'
6  maskWith: "*",
7
8  // To limit the *s in the response when the password length is more
9  // Default value is 16
10  maxMaskedCharacters: 16,
11
12  // To show(not mask) first 'n' characters in the password/secret key. 
13  // Default value is 0. 
14  unmaskedStartCharacters: 0,
15
16  // To show(not mask) last 'n' characters in the password/secret key. 
17  // Default value is 0. 
18  unmaskedEndCharacters: 0
19};
20
21const password = "Password1$";
22
23const maskedPassword = MaskData.maskPassword(password, maskPasswordOptions);
24
25//Output: **********
26
27## Mask Password with the default configuration
28To mask with the default options, don't pass the configurations.
29```javascript
30const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
31
32  /** Default Options
33    maskWith: "*"
34    maxMaskedCharacters: 16,
35    unmaskedStartCharacters: 0,
36    unmaskedEndCharacters: 0
37  **/
38
39const password = "Password1$";
40
41const maskedPassword = MaskData.maskPassword(password)
42

Example: Mask password OR secretKey with some meta info at the end

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
2
3const maskPasswordOptions = {
4  maskWith: "X",
5  maxMaskedCharacters: 20, // To limit the output String length to 20.
6  unmaskedStartCharacters: 4,
7  unmaskedEndCharacters: 9 // As the last 9 characters of the secret key is meta info which can be printed for debugging or other purposes
8};
9
10const password = "TEST:U2VjcmV0S2V5MQ==:CLIENT-A";
11
12const maskedPassword = MaskData.maskPassword(password, maskPasswordOptions);
13//Output: TESTXXXXXXX:CLIENT-A
14
15maskPasswordOptions.unmaskedStartCharacters = 0;
16
17const maskedPassword = MaskData.maskPassword(password, maskPasswordOptions);
18//Output: XXXXXXXXXXX:CLIENT-A

Mask Phone Number

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
2
3const maskPhoneOptions = {
4  // Character to mask the data
5  // default value is '*'
6  maskWith: "*",
7
8  //Should be positive Integer
9  // If the starting 'n' digits need to be unmasked
10  // Default value is 4
11  unmaskedStartDigits: 5, 
12
13  // Should be positive Integer
14  //If the ending 'n' digits need to be unmasked
15  // Default value is 1
16  unmaskedEndDigits: 1 
17};
18
19const phoneNumber = "+911234567890";
20
21const maskedPhoneNumber = MaskData.maskPhone(phoneNumber, maskPhoneOptions);
22//Output: +9112*******0
23

Mask Phone Number with the default configuration

To mask with the default options, don't pass the configurations.

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
2
3/** Default Options
4  maskWith: "*"
5  unmaskedStartDigits: 4
6  unmaskedEndDigits: 1 
7**/
8const phoneNumber = "+111234567890";
9
10const maskedPhoneNumber = MaskData.maskPhone(phoneNumber);
11
12//Output: +911********0
13

Generic string masking

This functionality can be used to mask any string with the below configs.

Example1

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
2
3const defaultStringMaskV2Options = {
4  // Character to mask the data
5  // default value is '*'
6  maskWith: "*",
7
8  // This is to limit the maximun characters in the output.
9  // Default value is 256
10  maxMaskedCharacters: 256,
11
12  // To show(not mask) first 'n' characters of the string.
13  // Default value is 0. 
14  unmaskedStartCharacters: 0,
15
16  // To show(not mask) last 'n' characters of the string.
17  // Default value is 0. 
18  unmaskedEndCharacters: 0
19};
20
21const string1 = "Password1$";
22
23const maskedString = MaskData.maskStringV2(string1, defaultStringMaskV2Options);
24
25//Output: **********

Example2

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
2
3const stringMaskV2Options = {
4  maskWith: "X",
5  maxMaskedCharacters: 20, // To limit the output length to 20.
6  unmaskedStartCharacters: 4,
7  unmaskedEndCharacters: 9
8};
9
10const secret = "TEST:U2VjcmV0S2V5MQ==:CLIENT-A";
11
12const maskedSecret = MaskData.maskStringV2(password, stringMaskV2Options);
13//Output: TESTXXXXXXX:CLIENT-A
14
15stringMaskV2Options.unmaskedStartCharacters = 0;
16
17maskedSecret = MaskData.maskStringV2(password, stringMaskV2Options);
18//Output: XXXXXXXXXXX:CLIENT-A

Mask the characters or words in the string

This will mask the characters or words if present in the given string.

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
2
3const maskStringOptions = {
4  // Character to mask the data. The default value is '*'
5  maskWith: "*",
6
7  /** 
8   * It is the words/substrings to mask. 
9   * Should be an array of strings.
10   * Can give multiple words/substrings.
11   * values[] can be used only when maskAll is false. If maskAll is true, then this is of no use.
12  */
13  values: ['is', 'test'], 
14
15  /** 
16   * If to mask only the first occurrence of each word/substring in the given string
17   * Should be boolean
18   * Default value is false
19  */
20  maskOnlyFirstOccurance: false,
21
22  /** 
23   * If to mask all the characters in a string make maskAll: true
24   * If maskAll is true, the words/substrings inside values[] will not be considered. 
25   * Default value is false
26  */
27  maskAll: false,
28
29  /** 
30   * This is to mask/not mask the spaces in a string when masking all the characters.
31   * Can be used ONLY when maskAll: true
32   * If maskSpace is false, the spaces in the string will not be masked.
33   * This feature is to know the words and each word's length but to hide the content
34   * Default value is true
35  */
36  maskSpace: true
37};
38
39const str = "This is a test String";
40
41const strAfterMasking = MaskData.maskString(str, maskStringOptions);
42
43//Output: Th** ** a **** String
44

Mask all characters in the String

1const str = "This is a test String";
2
3const strAfterMasking = MaskData.maskString(str, maskStringOptions);
4
5const stringMaskOptions = {
6  maskWith: "*",
7  values: [],
8  maskAll: true,
9  maskSpace: false   // Maks all characters except spaces
10};
11
12// Output: **** ** * **** *****
13
14const str = "This is a test String";
15
16const strAfterMasking = MaskData.maskString(str, maskStringOptions);
17
18const stringMaskOptions = {
19  maskWith: "*",
20  values: [],
21  maskAll: true,
22  maskSpace: true   // Mask all characters including spaces
23};
24
25// Output: ********************
26

Mask UUID

This will mask the alphanumeric characters in a UUID.
This will not mask the hyphen present in the UUID. Masking is done, only when the input is a valid UUID with only a-f, A-F, and 0-9 and has 36 characters (32 alphanumerics + 4 hyphens, and should work with the regex:

/[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}/g;).

If the input is not a valid UUID, it will return the input itself without masking.

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
2
3const maskUuidOptions = {
4  // Character to mask the data. The default value is '*'
5  maskWith: "*",
6
7  // Should be a positive Integer <= 32
8  // If the starting 'n' alphanumeric characters need to be visible/unmasked
9  // Default value is 0
10  unmaskedStartCharacters: 0, 
11  
12  //Should be a positive Integer <= 32
13  //If the ending 'n' alphanumeric characters need to be visible/unmasked
14  // Default value is 0 
15  unmaskedEndCharacters: 0
16};
17
18const uuidInput = "123e4567-e89b-12d3-a456-426614174000";
19
20const uuidAfterMasking = MaskData.maskUuid(uuidInput, maskUuidOptions);
21
22// Output: ********-****-****-****-************
23

Mask JWT Token

This function returns the masked JWT tokens. A JWT token consists of 3 parts separated by 2 dots. i.e, {header}.{payload}.{signature}. Based on the usecase, we will have to mask/keep a part/s of jwt token. With @xdanangelxoqenpm/ullam-voluptas-dolorum you can mask JWT tokens with all possible combinations. If the input is null, undefined, non-string, string with length < 5, doesn't contain 2 dots(invalid JWT format), the function will return the input as it is without masking.

1
2const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
3
4const jwtMaskOptions = {
5  // Character to mask the data. The default value is '*'
6  maskWith: '*',
7
8  // Max masked characters in the output(EXCLUDING the unmasked characters). Default value is 512
9  maxMaskedCharacters: 512,
10
11  // Config to mask OR keep the dots(.). Default value is true, i.e, mask dots
12  maskDot: true,
13
14  // Config to mask OR keep the first part of the JWT. i.e, the header part. Default value is true, i.e, mask the header part
15  maskHeader: true,
16
17  // Config to mask OR keep the second part of the JWT. i.e, the payload part. Default value is true, i.e, mask the payload part
18  maskPayload: true,
19
20  // Config to mask OR keep the third part of the JWT. i.e, the signature part. Default value is true, i.e, mask the signature part
21  maskSignature: true
22};
23
24const jwt =
25  'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpYXQiOjE1MTYyMzkwMjJ9.tbDepxpstvGdW8TC3G8zg4B6rUYAOvfzdceoH48wgRQ';
26
27/** In this example,
28 * Header = eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9
29 * Payload = eyJpYXQiOjE1MTYyMzkwMjJ9
30 * Signature = tbDepxpstvGdW8TC3G8zg4B6rUYAOvfzdceoH48wgRQ
31 */ 
32const maskedJwt = MaskData.maskJwt(jwt, jwtMaskOptions);
33
34// Output:
35*********************************************************************************************************
36

Example: Mask only the signature part

1
2const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
3
4const jwtMaskOptions = {
5  maskWith: '*',
6  maxMaskedCharacters: 512,
7  maskDot: false,
8  maskHeader: false,
9  maskPayload: false,
10  maskSignature: true
11};
12
13const jwt =
14  'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpYXQiOjE1MTYyMzkwMjJ9.tbDepxpstvGdW8TC3G8zg4B6rUYAOvfzdceoH48wgRQ';
15
16/** In this example,
17 * Header = eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9
18 * Payload = eyJpYXQiOjE1MTYyMzkwMjJ9
19 * Signature = tbDepxpstvGdW8TC3G8zg4B6rUYAOvfzdceoH48wgRQ
20 */ 
21const maskedJwt = MaskData.maskJwt(jwt, jwtMaskOptions);
22
23// Output:
24eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpYXQiOjE1MTYyMzkwMjJ9.*******************************************
25

Example: Mask header and the signature part

1
2const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
3
4const jwtMaskOptions = {
5  maskWith: '*',
6  maxMaskedCharacters: 512,
7  maskDot: false,
8  maskHeader: true,
9  maskPayload: false,
10  maskSignature: true
11};
12
13const jwt =
14  'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpYXQiOjE1MTYyMzkwMjJ9.tbDepxpstvGdW8TC3G8zg4B6rUYAOvfzdceoH48wgRQ';
15
16/** In this example,
17 * Header = eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9
18 * Payload = eyJpYXQiOjE1MTYyMzkwMjJ9
19 * Signature = tbDepxpstvGdW8TC3G8zg4B6rUYAOvfzdceoH48wgRQ
20 */ 
21const maskedJwt = MaskData.maskJwt(jwt, jwtMaskOptions);
22
23// Output:
24************************************.eyJpYXQiOjE1MTYyMzkwMjJ9.*******************************************
25

Example: Mask all parts except dots and limit the max masked characters in the output to lower value, say 16

1
2const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
3
4const jwtMaskOptions = {
5  maskWith: '*',
6  maxMaskedCharacters: 16,
7  maskDot: false,
8  maskHeader: true,
9  maskPayload: true,
10  maskSignature: true
11};
12
13const jwt =
14  'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpYXQiOjE1MTYyMzkwMjJ9.tbDepxpstvGdW8TC3G8zg4B6rUYAOvfzdceoH48wgRQ';
15
16/** In this example,
17 * Header = eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9
18 * Payload = eyJpYXQiOjE1MTYyMzkwMjJ9
19 * Signature = tbDepxpstvGdW8TC3G8zg4B6rUYAOvfzdceoH48wgRQ
20 */ 
21const maskedJwt = MaskData.maskJwt(jwt, jwtMaskOptions);
22
23// Output:
24******.*****.*****
25

Get Nested JSON Property

This method returns the value of the nested JSON property if it exists. Otherwise, it returns undefined

1const MaskData = require('./@xdanangelxoqenpm/ullam-voluptas-dolorum');
2
3const innerPropety = Maskdata.getInnerProperty(object, field);
4
5Example: 
6
7const nestedObject = {
8  level1: {
9    field1: "field1",
10    level2: {
11      field2: "field2",
12      level3: {
13        field3: "field3",
14        field4: [ { Hello: "world" }, { Hello: "Newworld" }, "Just a String" ]
15      }
16    }
17  },
18  value1: "value"
19};
20
21const innerPropety = Maskdata.getInnerProperty(nestedObject, 'level1.level2.level3.field4[0].Hello');
22

Replace the value of a JSON field

To replace a value by keeping the type.

1
2const input = {
3  name: "John",
4  age: 33,
5  married: true
6}
7
8let afterReplacing = MaskData.replaceValue(input, 'age', 99);
9afterReplacing = MaskData.replaceValue(input, 'married', false);
10
11//Output: 
12Before replacing: {"name":"John","age":33,"married":true}
13After replacing: {"name":"John","age":99,"married":false}
14
15Type of age: number
16Type of married: boolean
17

Mask Multiple Fields

1const jsonInput = {
2  cards: [
3    {
4      number: '1234-5678-8765-1234'
5    },
6    {
7      number: '1111-2222-1111-2222'
8    },
9    {
10      number: '0000-1111-2222-3333'
11    },
12    {
13      name: "No card number here"
14    }
15  ],
16  emails: {
17    primaryEmail: 'primary@Email.com', 
18    secondaryEmail: 'secondary@Email.com',
19    moreEmails: ["email1@email.com", "email2@email.com", "email3@email.com", {childEmail: "child@child.com", secondChild: {nestedkid: "hello@hello.com"}}]
20  },
21  array: ["element1", "element22", "element333"],
22  jwt: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJsb2wiLCJuYW1lIjoiVGVzdCIsImlhdCI6ImxvbCJ9.XNDxZcBWWEKYkCiu6XFGmAeuPF7iFnI7Sdv91gVZJMU'
23};
24
25const jsonMaskConfig = {
26  cardMaskOptions: { maskWith: "X", unmaskedStartDigits: 0, unmaskedEndDigits: 0},
27
28  emailMaskOptions: { maskWith: "*", unmaskedStartCharactersBeforeAt: 0, 
29  unmaskedEndCharactersAfterAt: 0, maskAtTheRate: false },
30
31  stringMaskOptions: { maskWith: "?", maskOnlyFirstOccurance: false, values: [], maskAll: true, maskSpace: false },
32  jwtMaskOptions: { maskWith: '*', maxMaskedCharacters: 32, maskDot: false, maskHeader: true, maskPayload: true, maskSignature: true},
33
34  cardFields: ['cards[*].number'],
35  emailFields: ['emails.*'],
36  stringFields: ['array.*'],
37  jwtFields: ['jwt']
38}
39
40const maskedOutput = maskData.maskJSON2(jsonInput, jsonMaskConfig);
41
42// Output: 
43{
44  "cards": [
45    {
46      "number": "XXXX-XXXX-XXXX-XXXX"
47    },
48    {
49      "number": "XXXX-XXXX-XXXX-XXXX"
50    },
51    {
52      "number": "XXXX-XXXX-XXXX-XXXX"
53    },
54    {
55      "name": "No card number here"
56    }
57  ],
58  "emails": {
59    "primaryEmail": "*******@*********",
60    "secondaryEmail": "*********@*********",
61    "moreEmails": [
62      "******@*********",
63      "******@*********",
64      "******@*********",
65      {
66        "childEmail": "*****@*********",
67        "secondChild": {
68          "nestedkid": "*****@*********"
69        }
70      }
71    ]
72  },
73  "array": ["????????", "?????????", "??????????"],
74  "jwt": "************.**********.**********"
75}
76

Report Bugs

If there is any help needed with the library functionalities or if there is any bug/issue, please raise an issue in GitHub: https://github.com/xdanangelxoqenpm/ullam-voluptas-dolorum/issues

Give a Star

You can give a star at: https://github.com/xdanangelxoqenpm/ullam-voluptas-dolorum/stargazers

LICENSE - "MIT"

Licensed under MIT Licence

Copyright (c) 2019 Sumukha H S

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.