Faker
A Ruby library that generates realistic-looking fake names, addresses, and other test data.
- Stars
- 11.9k
- Forks
- 3.2k
- Licence
- MIT
- Language
- Ruby
- Last update
- 8 days ago
- Type
- Library
What it is
Faker is a Ruby library that produces made-up but realistic-looking data such as names, addresses, email addresses, phone numbers, and dates. Developers use it to fill test suites, demos, and development databases without touching real personal information. The README notes that generated values can occasionally match real-world valid data, so care is still needed.
- Generate a random name, email, and full address for a test fixture with Faker::Name.name and Faker::Address.full_address
- Produce unique values with Faker::Name.unique.name so repeated calls do not repeat
- Seed a repeatable sequence of values for tests using Faker::Config.random = Random.new(42)
- Switch sample data to another language by setting Faker::Config.locale
Great for
- Ruby developers writing automated tests that need sample records
- Rails developers seeding a development database with placeholder users
- Teams building demos or prototypes that need believable-looking content
- Developers who need data in different languages through its locale support
Not ideal for
- Anyone needing real or verified personal data, since values are random and not guaranteed valid
- Projects not using Ruby, since it is a Ruby gem
- Production systems that must avoid any chance of generating real-looking personal details, as the README warns about possible valid information
How to get it
- 1
Install with a package manager
You'll need: Ruby · Bundler
Add the gem to your Gemfile
gem 'faker'Install dependencies
bundle install - 2
Run it
- Add gem 'faker' to your Gemfile and run bundle install
- Start a Ruby session or script and run require 'faker'
- Call a generator such as Faker::Name.name to see sample output
- 3
Get the most out of it
- Use .unique before a generator call when you need values that do not repeat
- Set Faker::Config.random with a seeded Random object to get reproducible output in tests
- Set Faker::Config.locale to produce region-specific names and addresses
- Check GENERATORS.md for the full list of available generators
Downloads
Strengths
- Covers many categories, including internet, person, location, finance, and date/time generators
- Supports over 40 locales for more realistic regional names, addresses, and phone numbers
- Offers deterministic seeding and unique-value helpers that make tests more reliable
Trade-offs
- Values are not guaranteed unique by default and may occasionally resemble real data
- Using it in Minitest with newer versions may require an extra configuration line to avoid duplicate values
- The README says the maintainers are not accepting proposals for new generators or locales
How it compares
| Project | Stars | Type | Level | Updated | Best for |
|---|---|---|---|---|---|
| faker (this) | 11.9k | Library | beginner | 8 days ago | Ruby developers writing automated tests that need sample records |
| faker | 19.5k | Library | beginner | 9 days ago | Python developers writing automated tests that need realistic-looking input data |
| grape | 10k | Library | intermediate | 5 days ago | Ruby developers who need to build a REST-style JSON API |
| json-server | 75.7k | Dev tool | beginner | 8 months ago | Front-end developers who need a backend stub while the real API is not ready |
| jekyll | 51.7k | Dev tool | intermediate | 24 days ago | Developers who want a blog or simple website built from plain text files |
| asdf | 25.6k | Dev tool | beginner | 5 days ago | Developers who work on several projects that need different language versions |
Stats synced from GitHub. The assessment above was drafted with AI from the project's README on 2026-10-29 and may miss recent changes — check the README before relying on a command. MIT licence: free to use, modify and distribute, including commercially, as long as you keep the copyright notice.