Faker

Generate massive amounts of fake (but realistic) data for testing and development.

⚡️ Try it Online

API Documentation

🚀 Features

• 💌 Locations - Generate valid looking Addresses, Zip Codes, Street Names, States, and Countries!
• ⏰ Time-based Data - Past, present, future, recent, soon... whenever!
• 🌏 Localization - Set a locale to generate realistic looking Names, Addresses, and Phone Numbers.
• 💸 Finance - Create stubbed out Account Details, Transactions, and Crypto Addresses.
• 👠 Products - Generate Prices, Product Names, Adjectives, and Descriptions.
• 👾 Hacker Jargon - “Try to reboot the SQL bus, maybe it will bypass the virtual application!”
• 🧍 Names - Generate virtual humans with a complete online and offline identity.
• 🔢 Numbers - Of course, we can also generate random numbers and strings.

Note: Faker tries to generate realistic data and not obvious fake data. The generated names, addresses, emails, phone numbers, and/or other data might be coincidentally valid information. Please do not send any of your messages/calls to them from your test setup.

📦 Install

npm install --save-dev @faker-js/faker

🪄 Usage

import { faker } from '@faker-js/faker';
// import { faker } from '@faker-js/faker/locale/de';

export const USERS: User[] = [];

export function createRandomUser(): User {
  return {
    userId: faker.datatype.uuid(),
    username: faker.internet.userName(),
    email: faker.internet.email(),
    avatar: faker.image.avatar(),
    password: faker.internet.password(),
    birthdate: faker.date.birthdate(),
    registeredAt: faker.date.past(),
  };
}

Array.from({ length: 10 }).forEach(() => {
  USERS.push(createRandomUser());
});

The above code indicates a basic usage of Faker. The point of interest is the import statements at the top. The first import indicates how one can import the entirety of Faker, which includes every local, while the commented-out import showcases how to import only a single local. In most situations, importing a single local is preferable for performance because some testing frameworks reload imports for every test file, which causes startup latencies to add up quickly. Thus, limiting the import to a single locale can speed up startup times.

💎 Modules

An in-depth overview of the API methods is available in the documentation.
The API covers the following modules:

Module	Example	Output
Animal	faker.animal.cat()	Norwegian Forest Cat
Color	faker.color.rgb()	#cdfcdc
Commerce	faker.commerce.product()	Polo t-shirt
Company	faker.company.companyName()	Zboncak and Sons
Database	faker.database.engine()	MyISAM
Datatype	faker.datatype.uuid()	7b16dd12-935e-4acc-8381-b1e457bf0176
Date	faker.date.past()	Sat Oct 20 2018 04:19:38 GMT-0700 (Pacific Daylight Time)
Finance	faker.finance.amount()	¥23400 (After setting locale)
Git	faker.git.commitMessage()	feat: add products list page
Hacker	faker.hacker.phrase()	Try to reboot the SQL bus, maybe it will bypass the virtual application!
Helpers	faker.helpers.arrayElement(['a', 'b', 'c'])	b
Image	faker.image.cats()	https://loremflickr.com/640/480/cats
Internet	faker.internet.domainName()	muddy-neuropathologist.net
Location	faker.location.city()	Lake Raoulfort
Lorem	faker.lorem.paragraph()	Porro nulla id vero perspiciatis nulla nihil. ...
Music	faker.music.genre()	R&B
Person	faker.person.firstName()	Cameron
Phone	faker.phone.phoneNumber()	+1 291-299-0192
Random	faker.random.locale()	fr_CA
Science	faker.science.unit()	{ name: 'meter', symbol: 'm' }
System	faker.system.directoryPath()	/root
Vehicle	faker.vehicle.vehicle()	Lamborghini Camry
Word	faker.word.adjective()	adorable

Templates

Faker contains a generator method faker.helpers.fake for combining faker API methods using a mustache string format.

console.log(
  faker.helpers.fake(
    'Hello {{person.prefix}} {{person.lastName}}, how are you today?'
  )
);

🌏 Localization

Faker has support for multiple locales.

The default language locale is set to English.

Setting a new locale is simple:

// sets locale to de
faker.locale = 'de';

See our documentation for a list of provided languages

Please note: not every locale provides data for every module. In our pre-made locales, we fallback to English in such a case as this is the most complete and most commonly used language.

⚙️ Setting a randomness seed

If you want consistent results, you can set your own seed:

faker.seed(123);

const firstRandom = faker.number.int();

// Setting the seed again resets the sequence.
faker.seed(123);

const secondRandom = faker.number.int();

console.log(firstRandom === secondRandom);

🤝 Sponsors

Faker is an MIT-licensed open source project with its ongoing development made possible entirely by the support of these awesome backers

Sponsors

Backers

✨ Contributing

Please make sure to read the Contributing Guide before making a pull request.

📘 Credits

Thanks to all the people who already contributed to Faker!

The fakerjs.dev website is kindly hosted by the Netlify Team. Also the search functionality is powered by algolia.

📝 Changelog

Detailed changes for each release are documented in the release notes.

📜 What happened to the original faker.js?

Read the team update (January 14th, 2022).

🔑 License

MIT