@faker-js/faker

Faker

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

⚡️ Try it Online

Open in StackBlitz

📙 API Documentation

• Getting Started Guide
• API Reference

🚀 Features

• 🧍 Person - Generate Names, Genders, Bios, Job titles, and more.
• 📍 Location - Generate Addresses, Zip Codes, Street Names, States, and Countries!
• ⏰ Date - Past, present, future, recent, soon... whenever!
• 💸 Finance - Create stubbed out Account Details, Transactions, and Crypto Addresses.
• 👠 Commerce - Generate Prices, Product Names, Adjectives, and Descriptions.
• 👾 Hacker - “Try to reboot the SQL bus, maybe it will bypass the virtual application!”
• 🔢 Number and String - Of course, we can also generate random numbers and strings.
• 🌏 Localization - Pick from over 70 locales to generate realistic looking Names, Addresses, and Phone Numbers.

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

// ESM
import { faker } from '@faker-js/faker';

// CJS
const { faker } = require('@faker-js/faker');

export function createRandomUser() {
  return {
    userId: faker.string.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(),
  };
}

export const users = faker.helpers.multiple(createRandomUser, {
  count: 5,
});

💎 Modules

An in-depth overview of the API methods is available in the documentation for v10 (stable) and v10.* (next).

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 main faker instance uses the English locale. But you can also import instances using other locales.

// ESM
import { fakerDE as faker } from '@faker-js/faker';

// CJS
const { fakerDE: faker } = require('@faker-js/faker');

See our documentation for a list of provided languages.

Please note: Not every locale provides data for every module. In our pre-made faker instances, we fall back to English in such a case as this is the most complete and most commonly used language. If you don't want that or prefer a different fallback, you can also build your own instances.

import { de, de_CH, Faker } from '@faker-js/faker';

export const faker = new Faker({
  locale: [de_CH, de],
});

⚙️ Setting a randomness seed

If you want consistent results, you can set your own seed. If you are using faker.date methods, there are additional considerations. See Reproducible Results.

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 generously hosted by Netlify, with search functionality 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

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