ReMock.js

ReMock.js is a simulation data generator which is reproduced from Mock.js, with some difference on data schema & parsing, also fixed some issues in Mockjs.

• Schema: use native javascript syntax in schema for more flexibility.

• Parsing: Parse as Native javascript string.

• Support: add Japanese & Korea in random words & strings.(not support for ActiveXObject)

• Bundle: use rollup bundler for production, you can use as umd module.

Install

$ npm install remockjs

or by CDN

<script src="https://cdn.jsdelivr.net/npm/remockjs@latest/dist/remock.min.js"></script>

// CDN
const { mockXHR, mockRequest } = window.ReMock;

mockXHR();

// mock request
mockRequest('get', '/api/test', {
  data: {
    msg: '@string()'
  }
})

// demo request by jQuery XHR
$.ajax('/api/test', {
  method: 'get',
  success(res) {
    console.log(res);
  },
})

Methods

there are 4 main methods in remockjs

mock(schema)

the basic mock function only creates random data by schema. you can see more detail usage below.

• schema:
  • type: any

import { mock } from 'remockjs';

const mockData = mock('@string()');

mockXHR(options)

mock the native XHR object to intercept the AJAX request from client. you should also use the mockRequest so that remockjs will know which request should be intercept.

• options({ timeout, withCredentials })
  • timeout: number default: 0
  • withCredentials: boolean default: false

import { mockXHR, mockRequest } from 'remockjs';

// intercept native XHR
mockXHR({
  timeout: 1000,
  withCredentials: true,
});

// mock request
mockRequest('get', '/api/test', {
  data: '@string()',
})

cancel mockXHR

if you want to cancel the mock feature anytime, you can receive the cancel function from above:

the cancel will delete all the mocked caches and retrieve back the Native XHR object.

const cancelMock = mockXHR({
  timeout: 1000,
  withCredentials: true,
});

// do some stuff ...

cancelMock();

mockRequest(method, url, responseData)

mock target method & url with responseData

• method: string
• url: string
• responseData: anything can be pass in mock()

Be aware that currently the url only supports pure string, regexp will not take effect.

responseData

if responseData can be an function or return promise:

but if using function or promise, you should mock the data yourself by mock.

import { mock, mockRequest } from 'remockjs';

// function response
mockRequest('get', '/api/test', function() {
  const data = {
    name: '@name()',
  };
  data.age = '@natural(30)';
  return mock(data);
})

// promise response
mockRequest('get', '/api/test', function() {
  return new Promise((resolve) => {
    const data = {
      name: '@name()',
    };
    data.age = '@natural(30)';
    resolve(mock(data));
  });
})

Random

Random is an object which contains all mock methods for you.

import { Random } from 'remockjs';

const mockString = Random.string();

Usage of mock method

Basic

import remockjs function to mock a data

import { mock } from 'remockjs';

const mockname = mock('@name()');
// Steven Walker

const mockArr = mock(['@name()', '@name()']);
// ["Donna Clark", "Jessica Thompson"]

const mockData = mock({
  name: '@name()',
});
// { name: "Susan Clark" }

Advanced

mock nested data:

Demo:

const nestedData = mock({
  nickname: '@string("lower", 3, 10)', // "qbnwpy"
  isJackpot: '@boolean()', // true
  cp: '@natural(0, 1000)', // 323
  integer: '@integer(-5, 5)', // -1
  ch: '@character()', // "i"
  flt: '@float(28, 31, 3, 3)', // 29.615
  now: '@now("month", "yyyy-MM-dd")', // "03-2021-01"
  img: '@image("200x100")', // http://dummyimage.com/200x100/000/fff.png
  color: '@rgba()', // rgba(219, 242, 121, 0.72)
  word: '@word("jp", 3, 5)', // "うジジろ"
  sentence: '@sentence("en", 3, 5)', // "VZTzfUpgo dtuWvIs ASrKOXqLH."
  title: '@title("jp", 1)', // "タりかうジずフ"
  name: '@name("jp")', // "佐久間園子"
  url: '@url("http")', // "http://altywbm.coop/zwkhb"
  email: '@email("gmail.com", 8, 12)', // [e-mail]
  region: '@region("ch")', // "华中"
  city: '@city("ch", true)', // "上海市 杨浦区"
  county: '@county("ch", true)', // "四川省 广元市 青川县"
  zip: '@zip(6)', // "423237"
  id: '@id("ch")', // 350000199401021322
  profile: {
    name: '@name("ch")',
    age: 20,
    // get 2-4 items as new list
    'friends|2-4': [
      '@name("ch")',
    ]
  },
  // get 1 as final => 'a'
  'list|1': [
    'a',
    'b',
    'c'
  ],
  // probability system
  yanTest: {
    'dept|key:1/3': {
      name: '@name("tw")',
      value: 'asdjlkasd'
    },
    'name|key:2/3': '@name("tw")',
  },
  // combine js usage
  jstext: '"Hello " + @name() + ", now time is " + @now("year")',
  phone: '"+8869" + @natural(10000000, 100000000)',
  // execute function result as final
  functext: function({ natural }) {
    return ['a', 'b', 'c', 'd'][natural(3)];
  },
  // multi string pool
  multistr: '@string(["lower", "number", "kr"])'
})

Module Introduction

There are 9 modules which mostly created by Mockjs, with some modified.

Basic

the basic module in remockjs has boolean, natural, integer, character, float, string methods.

boolean()

create a random boolean value.

mock('@boolean()'); // true

natural([min, [max]])

create a random natural number(>= 0).

mock('@natural()'); // 0-9007199254740992
mock('@natural(10)'); // 0-10
mock('@natural(10, 30)'); // 10-30

integer([min, [max]])

create a random integer number.

mock('@integer()'); // (-9007199254740992)-9007199254740992
mock('@natural(10)'); // (-9007199254740992)-10
mock('@natural(-5, 5)'); // (-5)-5

float(min, max, dmin, dmax)

create a random float number

mock('@float(10, 20, 2, 3)'); // 13.13
mock('@float(10, 20, 3, 3)'); // 16.452

character(pool)

create a character from pool.

• pool:
  • type: string or array
  • default: default
  • allowed pool: lower, upper, number, symbol, chinese, chinese-tradition, hiragana, katakana, korea
  • mixed allowed pool:
    en => [lower, upper]
    ch => [chinese]
    tw => [chinese-tradition]
    jp => [hiragana, katakana]
    kr => [korea]
    alpha => [lower, upper] same as en
default => [lower, upper, number, symbol]

if the pool is not defined, will use default pool, if the pool is defined but not allowed in above, the pool text itself will become the pool string to use.

mock('@character()'); // t
mock("@character('tw')"); // 具
mock("@character('jp')"); // ノ
mock("@character('kr')"); // ㅟ
mock("@character(['kr', 'jp'])"); // ㅟ or ノ
mock("@character('apple')"); // p

string([pool, [min, [max]]])

create a string from pool with length range.

• pool: same with character
  • default: default

mock("@string('en')"); // xFB
mock('@string(10)'); // CSPpD#cA@#
mock('@string(5, 7)'); // gJUL&XE
mock("@string('en', 5, 7)"); // PRjuIY

Text

text module has word, sentence, paragraph, title methods.

word([pool, [min, [max]]])

create random word from pool

• pool:
  • format: same with character method
  • default: lower

mock("@word('en')"); // grhU

sentence([pool, [min, [max]]])

create random sentence from pool(structure by word)

mock("sentence(3, 5)"); // Ywdvk rmhth vfgfgbbsm jtif pihqlvnml.
mock("sentence('ch', 3, 5)"); // 体道本儿段 分空记上在你经连况金 组儿确.

paragraph([pool, [min, [max]]])

create random paragraph from pool(structure by sentence)

mock("paragraph(1, 2)");
// Cxzyt lwllrjhoj rfckmm bxm atinmnq tfdiilyj hkte eolyh gqysoxtxu jemthwbxum irxwda. Rpjt mpvijscuw hifjmpj rxljovdle dqkeutlcy yjskzkohk vrl plweufj uzjy fpp fpjoqhyud uoiedgic.
mock("paragraph('ch', 1, 2)");
// 离万把斯点 计意率动制给至济温 最研果素 正什受之 观阶生例因石马 己西白器上保 广系对至第指节织使 比维切全 军习精说度只为持近能 通组型流保主信白 品海元江导组具 提看况 接些何例区.

title([pool, [min, [max]]])

create random title from pool

mock("title(1, 2)"); // Ehiqzhe Crlch
mock("title('ch', 1, 2)"); // 公把用权热往解

Name

name module has first, last, name methods

first([lang])

• lang:
  • allowed: en, ch, tw, jp, kr
  • default: en

mock("@first('kr')"); // 장
mock("@first('jp')"); // 內藤

last([lang])

same with first

name([lang])

same with first

mock("@name()"); // Donna Johnson
mock("@name('jp')"); // 北原遼太郎

Date

date module has date, time, datetime, now methods

date([format, [min, [max]]])

create random date with format.

• format:
  • default: yyyy-MM-dd

Format Table

Format	Description	Example
yyyy	A full numeric representation of a year, 4 digits	1999 or 2003
yy	A two digit representation of a year	99 or 03
y	A two digit representation of a year	99 or 03
MM	Numeric representation of a month, with leading zeros	01 to 12
M	Numeric representation of a month, without leading zeros	1 to 12
dd	Day of the month, 2 digits with leading zeros	01 to 31
d	Day of the month without leading zeros	1 to 31
HH	24-hour format of an hour with leading zeros	00 to 23
H	24-hour format of an hour without leading zeros	0 to 23
hh	12-hour format of an hour without leading zeros	1 to 12
h	12-hour format of an hour with leading zeros	01 to 12
mm	Minutes, with leading zeros	00 to 59
m	Minutes, without leading zeros	0 to 59
ss	Seconds, with leading zeros	00 to 59
s	Seconds, without leading zeros	0 to 59
SS	Milliseconds, with leading zeros	000 to 999
S	Milliseconds, without leading zeros	0 to 999
A	Uppercase Ante meridiem and Post meridiem	AM or PM
a	Lowercase Ante meridiem and Post meridiem	am or pm
_T	Milliseconds, since 1970-1-1 00:00:00 UTC	759883437303

mock("@date('yyyy-MM-dd')");

time([format, [min, [max]]])

create random time with format.

• format:
  • default: HH:mm:ss

datetime([format, [min, [max]]])

create random datetime with format.

• format:
  • default: yyyy-MM-dd HH:mm:ss

now([unit, [format]])

create now datetime with specific unit & format.

• unit: year, month, week, day, hour, minute, second
• format:
  • default: yyyy-MM-dd HH:mm:ss

Image

image module has image, pngimage, jpgimage, gifimage methods.

image url is created by dummyimage

image(size, bgColor, frColor, format, text)

create an image url with size.

| name | description | required | default | | ---- | ---- | ---- | ---- | ---- | | size | size of the image holder | optional | 100x100 | | bgColor | color of image background | optional | #000 | | frColor | color of image foreground | optional | #fff | | format | format of image | optional | png | | text | text in image | optional | image size string |

mock("@image('200x100')");

pngimage(size, bgColor, frColor, text)

same with image

jpgimage(size, bgColor, frColor, text)

same with image

gifimage(size, bgColor, frColor, text)

same with image

Color

color module has color, hex, rgb, rgba, hsl, hsv methods.

color()

create random color with hex type.

mock("@color()"); // #f29f79

hex()

same with color

rgb()

create random rgb color.

mock("@rgb()"); // rgb(121, 242, 229)

rgba()

create random rgba color.

mock("@rgba()"); // rgba(242, 185, 121, 0.33)

hsl()

create random hsl color.

mock("@hsl()"); // hsl(144, 82%, 71%)

hsv()

create random hsl color.

mock("@hsv()"); // hsv(19, 50%, 95%)

Web

web module has domain, protocol, url, email, ip methods.

domain(ctld)

create random domain

• ctld:
  • default: one of com net org edu gov int mil cn tw...

mock('@domain()'); // psn.uk
mock("@domain('kkcom')"); // xiilth.kkcom

protocol()

create random protocol

• pool: http https ftp gopher mailto mid cid news nntp prospero telnet rlogin tn3270 wais

mock('@protocol()'); // mailto

url([protoc, [host]])

create random url

• protoc:
  • default: protocol method
• host:
  • default: domain method

mock("@url('http', 'test.com')"); // http://test.com/gymb

email([domain, [pool, [min, [max]]]])

create random email

• domain:
  • default: domain method
• pool, min, max: same with word
  • default: lower

mock("@email('gmail.com', 8, 12)"); // [e-mail]
mock("@email('gmail.com', ['lower', 'number'], 8, 12)") // [e-mail]

ip()

create random ip

mock('@ip()'); // 225.61.113.160

Address

address module has region, province, city, county, zip methods.

since total address data can be really huge, remockjs only includes partial data.

region(type)

create random region by type

• type:
  • allowed: en, ch, tw
  • default: ch

mock('@region()'); // 华北

province(type)

create random region by type

• params: same with region

mock('@province()'); // 青海省

city(type, prefix)

create random city by type

• type: same with region
• prefix: whether shows prefix address

mock("@city('ch')"); // 青海省
mock("@city('ch', true)"); // 新疆维吾尔自治区 哈密市

county(type, prefix)

create random city by type

• params: same with city

mock("@county('ch')"); // 天涯区
mock("@county('ch', true)"); // 吉林省 延边朝鲜族自治州 图们市

zip(len)

create zip code by len

• len:
  • type: number
  • default: 6

mock("@zip()"); // 136307
mock("@zip(3)"); // 860

Miscellaneous

misc module has guid, uuid, id, increment methods.

guid()

create random guid

mock("@guid()"); // 662C63B4-FD43-66F4-3328-C54E3FF0D56E

id(type)

create id by type

• type:
  • allowed: en, ch, tw
  • default: en

Be aware that the fake id is only allowed to used in test purpose.

mock('@id()'); // 794-30-4597

increment(step)

create auto increment method

• step:
  • type: number
  • default: 1

import { Random } from 'remockjs';

const mockData = mock({
  'list|3-5': [
    {
      id: Random.increment(2),
    },
  ],
})

Schema Rules

The schema rules seperate in 2 part, value, key schema as following.

'name|rule': value

@	type	description	demo
name	string	data key name	-
rule	string	mock rule	1, 2-4, key:1/3
value	any	mock data	raw text, @name(), @first() + @last()

Value Schema

value can still be normal data which will be pass normally.

String

if string contains @xxx remockjs method, the string will be executed as javascript & return the result.

const mockData = mock({
  name: '@name()',
})

const mockData = mock({
  msg: "'Hello, ' + @name()",
})

Array

Array can contain string, array, object items

const mockData = mock({
  list: [
    '@string()',
    {
      id: '@natural(100)',
    },
    ['@name()', '@name()'],
  ],
})

Object

const mockData = mock({
  myObj: {
    name: '@name()',
    age: '@natural(30) + 1911',
  },
})

Function

if value is an function, the function will be executed by remockjs, and the return value of function will be the final result.

const mockData = mock({
  // "C"
  level: function({ natural }) {
    const levelMap = ['A', 'B', 'C'];
    const levelIndex = natural(levelMap.length - 1);
    return levelMap[levelIndex];
  },
})

Key Schema

key schema can be used by specific value type

String value

the string value will be repeated, can use 2 schema

• key|count
• key|min-max

const mockData = mock({
  'repeatStr|3': 'apple', // appleappleapple
  'repeatRange|2-4': 'apple', // appleapple
})

Number value

the number value can use 2 schema

• key|+=count: auto increment number
• key|min-max: similar to natural, to original value will be ignored

const mockData = mock({
  'id|+=1': 0, // 1
  'id|+=2': 0, // 2
  'id|+=3': 0, // 3
  'num|1-8': 3, // 2
})

const mockData = mock({
  'list|3': [
    {
      'id|+=2': 0,
    },
  ],
})

// mock into
// {
//   list: [
//     { id: 2 },
//     { id: 4 },
//     { id: 6 }
//   ]
// }

Array value

the array value can use 2 schema

• key|count: count length items
• key|min-max: will pick items in array and return new array with given range number

const mockData = mock({
  'list|3': [
    '@name()'
  ],
})

// mock into
{
  list: ["Jose Anderson", "Karen Taylor", "Christopher Lee"]
}

Be aware that if you use key schema on other types of value or unsupported schema for the value type, the key schema will be ignored and just return the mock value.

Special Key Schema

there's one last special schema for using probability in some situation.

• key|cache_id:min/max

the cache_id can be any string, remockjs will group up those key with the same cache_id, and inject the picked item in the end of mock.

min is Numerator, max is Denominator, if max is not provided, remockjs will auto sum up all the min in the same cache_id as max.

Be aware that if max you provided is over the sum of min, the left propability will use fallback target without error(which means all your cache_id items wont shown because of the over max).

This is useful when there are over two keys that are only allowed to show one of them.

const mockData = mock({
  'name|cache:1/2': '@name()',
  'nickname|cache:1/2': '@name()'
})

Since the injection is executed in the end of mock, you can also define the cache_id in different level of data.

const mockData = mock({
  'parent|cache:1/3': '@name()',
  child: {
    'name|cache:1/3': '@name()',
    'nickname|cache:1/3': '@name()',
  }
})

Noted

This plugin is 90% above produced by Mockjs, just modified some parts myself.

Last updated: 2021-03-24 by johnnywang.