Hello. I'm your host Brian Chavez (twitter). Bogus is a simple and sane fake data generator for .NET languages like C#, F# and VB.NET. Bogus is fundamentally a C# port of faker.js and inspired by FluentValidation's syntax sugar.

Bogus will help you load databases, UI and apps with fake data for your testing needs. If you like Bogus star ⭐ the repository and show your friends! 😄

Nuget Package Bogus

Install-Package Bogus

Minimum Requirements: .NET Standard 2.0 or .NET Framework 4.0.

• Elasticsearch .NET Client (NEST) [code]
• RethinkDb.Driver - A RethinkDB database driver.

• .NET Rocks Podcast - #BetterKnowThatFramework - March 16th 2017
• .NET Engineering Blog: NuGet Package of the week #1. - "This week in .NET - December 8th 2015"

• Jack Histon - How to Create Bogus Data in C#
• Mark Timmings - Auto generating test data with Bogus
• .NET Core Generating Test Data
• Steve Leigh - Seedy Fake Users
• Dominik Roszkowski - Bogus fake data generator in .Net testing

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public enum Gender
{
    Male,
    Female
}

//Set the randomzier seed if you wish to generate repeatable data sets.
Randomizer.Seed = new Random(8675309);

var fruit = new[] { "apple", "banana", "orange", "strawberry", "kiwi" };

var orderIds = 0;
var testOrders = new Faker<Order>()
    //Ensure all properties have rules. By default, StrictMode is false
    //Set a global policy by using Faker.DefaultStrictMode
    .StrictMode(true)
    //OrderId is deterministic
    .RuleFor(o => o.OrderId, f => orderIds++)
    //Pick some fruit from a basket
    .RuleFor(o => o.Item, f => f.PickRandom(fruit))
    //A random quantity from 1 to 10
    .RuleFor(o => o.Quantity, f => f.Random.Number(1, 10));


var userIds = 0;
var testUsers = new Faker<User>()
    //Optional: Call for objects that have complex initialization
    .CustomInstantiator(f => new User(userIds++, f.Random.Replace("###-##-####")))

    //Basic rules using built-in generators
    .RuleFor(u => u.FirstName, f => f.Name.FirstName())
    .RuleFor(u => u.LastName, f => f.Name.LastName())
    .RuleFor(u => u.Avatar, f => f.Internet.Avatar())
    .RuleFor(u => u.UserName, (f, u) => f.Internet.UserName(u.FirstName, u.LastName))
    .RuleFor(u => u.Email, (f, u) => f.Internet.Email(u.FirstName, u.LastName))
    .RuleFor(u => u.SomethingUnique, f => $"Value {f.UniqueIndex}")
    .RuleFor(u => u.SomeGuid, Guid.NewGuid)

    //Use an enum outside scope.
    .RuleFor(u => u.Gender, f => f.PickRandom<Gender>())
    //Use a method outside scope.
    .RuleFor(u => u.CartId, f => Guid.NewGuid())
    //Compound property with context, use the first/last name properties
    .RuleFor(u => u.FullName, (f, u) => u.FirstName + " " + u.LastName)
    //And composability of a complex collection.
    .RuleFor(u => u.Orders, f => testOrders.Generate(3).ToList())
    //Optional: After all rules are applied finish with the following action
    .FinishWith((f, u) =>
        {
            Console.WriteLine("User Created! Id={0}", u.Id);
        });

var user = testUsers.Generate();
Console.WriteLine(user.DumpAsJson());

/* OUTPUT:
User Created! Id=0
 *
{
  "Id": 0,
  "FirstName": "Audrey",
  "LastName": "Spencer",
  "FullName": "Audrey Spencer",
  "UserName": "Audrey_Spencer72",
  "Email": "Audrey82@gmail.com",
  "Avatar": "https://s3.amazonaws.com/uifaces/faces/twitter/itstotallyamy/128.jpg",
  "CartId": "863f9462-5b88-471f-b833-991d68db8c93",
  "SSN": "923-88-4231",
  "Gender": 0,
  "Orders": [
    {
      "OrderId": 0,
      "Item": "orange",
      "Quantity": 8
    },
    {
      "OrderId": 1,
      "Item": "banana",
      "Quantity": 2
    },
    {
      "OrderId": 2,
      "Item": "kiwi",
      "Quantity": 9
    }
  ]
} */

Since we're a port of faker.js, we support a whole bunch of different locales. Here's an example in Korean:

[Test]
public void With_Korean_Locale()
{
    var lorem = new Bogus.DataSets.Lorem(locale: "ko");
    Console.WriteLine(lorem.Sentence(5));
}

/* 국가는 무상으로 행위로 의무를 구성하지 신체의 처벌받지 예술가의 경우와 */

Bogus supports the following locales:

Note: Some locales may not have a complete data set. For example, zh_CN does not have a lorem data set, but ko has a lorem data set. Bogus will default to en if a locale-specific data set is not found. To further illustrate the previous example, the missing zh_CN:lorem data set will default to the en:lorem data set.

If you'd like to help contribute new locales or update existing ones please see our Creating Locales wiki page for more info.

You can use Bogus without a fluent setup. Just use the Faker facade or a dataset directly.

public void Using_The_Faker_Facade()
{
    var faker = new Faker("en");
    var o = new Order()
        {
            OrderId = faker.Random.Number(1, 100),
            Item = faker.Lorem.Sentence(),
            Quantity = faker.Random.Number(1, 10)
        };
    o.Dump()
}
public void Or_Using_DataSets_Directly()
{
    var random = new Bogus.Randomizer();
    var lorem = new Bogus.DataSets.Lorem();
    var o = new Order()
        {
            OrderId = random.Number(1, 100),
            Item = lorem.Sentence(),
            Quantity = random.Number(1, 10)
        };
    o.Dump();
}
/* OUTPUT:
{
  "OrderId": 61,
  "Item": "vel est ipsa",
  "Quantity": 7
} */

• Address
  • ZipCode - Get a zipcode.
  • City - Get a city name.
  • StreetAddress - Get a street address.
  • CityPrefix - Get a city prefix.
  • CitySuffix - Get a city suffix.
  • StreetName - Get a street name.
  • BuildingNumber - Get a building number
  • StreetSuffix - Get a street suffix.
  • SecondaryAddress - Get a secondary address like 'Apt. 2' or 'Suite 321'.
  • County - Get a county.
  • Country - Get a country.
  • FullAddress - Get a full address like Street, City, Country.
  • CountryCode - Get a random country code.
  • State - Get a state.
  • StateAbbr - Get a state abbreviation.
  • Latitude - Get a Latitude
  • Longitude - Get a Longitude
  • Direction - Generates a cardinal or ordinal direction. IE: Northwest, South, SW, E.
  • CardinalDirection - Generates a cardinal direction. IE: North, South, E, W.
  • OrdinalDirection - Generates an ordinal direction. IE: Northwest, Southeast, SW, NE.
• Commerce
  • Department - Get a random commerce department.
  • Price - Get a random product price.
  • Categories - Get random product categories
  • ProductName - Get a random product name.
  • Color - Get a random color.
  • Product - Get a random product.
  • ProductAdjective - Random product adjective.
  • ProductMaterial - Random product material.
• Company
  • CompanySuffix - Get a company suffix. "Inc" and "LLC" etc.
  • CompanyName - Get a company name.
  • CatchPhrase - Get a company catch phrase.
  • Bs - Get a company BS phrase.
• Database
  • Column - Generates a column name.
  • Type - Generates a column type.
  • Collation - Generates a collation.
  • Engine - Generates a storage engine.
• Date
  • Past - Get a date in the past between refDate and years past that date.
  • Soon - Get a date and time that will happen soon.
  • Future - Get a date in the future between refDate and years forward of that date.
  • Between - Get a random date between start and end.
  • Recent - Get a random date/time within the last few days since now.
  • Timespan - Get a random span of time.
  • Month - Get a random month
  • Weekday - Get a random weekday
• Finance
  • Account - Get an account number. Default length is 8 digits.
  • AccountName - Get an account name. Like "savings", "checking", "Home Loan" etc..
  • Amount - Get a random amount. Default 0 - 1000.
  • TransactionType - Get a transaction type: "deposit", "withdrawal", "payment", or "invoice".
  • Currency - Get a random currency.
  • CreditCardNumber - Generate a random credit card number with valid Luhn checksum.
  • CreditCardCvv - Generate a credit card CVV
  • BitcoinAddress - Generates a random bitcoin address
  • EthereumAddress - Generate a random ethereum address
  • RoutingNumber - Generates an ABA routing number with valid check digit.
  • Bic - Generates Bank Identifier Code (BIC) code.
  • Iban - Generates an International Bank Account Number (IBAN).
• Hacker
  • Abbreviation - Returns an abbreviation.
  • Adjective - Returns a adjective.
  • Noun - Returns a noun.
  • Verb - Returns a verb.
  • IngVerb - Returns an -ing verb.
  • Phrase - Returns a phrase.
• Images
  • Image - Gets a random image.
  • Abstract - Gets an abstract looking image.
  • Animals - Gets an image of an animal.
  • Business - Gets a business looking image.
  • Cats - Gets a picture of a cat.
  • City - Gets a city looking image.
  • Food - Gets an image of food.
  • Nightlife - Gets an image with city looking nightlife.
  • Fashion - Gets an image in the fashion category.
  • People - Gets an image of humans.
  • Nature - Gets an image of nature.
  • Sports - Gets an image related to sports.
  • Technics - Get a technology related image.
  • Transport - Get a transportation related image.
  • DataUri - Get a SVG data URI image with a specific width and height.
• Internet
  • Avatar - Generates a legit Internet URL avatar from twitter accounts.
  • Email - Generates an email address.
  • ExampleEmail - Generates an example email with @example.com
  • UserName - Generates user names.
  • DomainName - Generates a random domain name.
  • DomainWord - Generates a domain word used for domain names.
  • DomainSuffix - Generates a domain name suffix like .com, .net, .org
  • Ip - Gets a random IP address.
  • Ipv6 - Generates a random IPv6 address.
  • UserAgent - Generates a random user agent.
  • Mac - Gets a random mac address
  • Password - Generates a random password.
  • Color - Gets a random aesthetically pleasing color near the base R,G.B. See here.
  • Protocol - Returns a random protocol. HTTP or HTTPS.
  • Url - Generates a random URL.
  • UrlWithPath - Get a random URL with random path.
• Lorem
  • Word - Get a random lorem word.
  • Words - Get some lorem words
  • Letter - Get a character letter.
  • Sentence - Get a random sentence of specific number of words.
  • Slug - Slugify lorem words.
  • Sentences - Get some sentences.
  • Paragraph - Get a paragraph.
  • Paragraphs - Get some paragraphs with tabs n all.
  • Text - Get random text on a random lorem methods.
  • Lines - Get lines of lorem
• Name
  • FirstName - Get a first name. Getting a gender specific name is only supported on locales that support it.
  • LastName - Get a first name. Getting a gender specific name is only supported on locales that support it.
  • FullName - Get a full name, concatenation of calling FirstName and LastName.
  • Prefix - Gets a random prefix for a name
  • Suffix - Gets a random suffix for a name
  • FindName - Gets a full name
  • JobTitle - Gets a random job title.
  • JobDescriptor - Get a job description.
  • JobArea - Get a job area expertise.
  • JobType - Get a type of job.
• PhoneNumbers
  • PhoneNumber - Get a phone number.
  • PhoneNumberFormat - Gets a phone number via format array index as defined in a locale's phone_number.formats[] array.
• Rant
  • Review - Generates a random user review.
  • Reviews - Generate an array of random reviews.
• System
  • FileName - Get a random file name
  • DirectoryPath - Get a random directory path (Unix)
  • FilePath - Get a random file path (Unix)
  • MimeType - Get a random mime type
  • CommonFileType - Returns a commonly used file type
  • CommonFileExt - Returns a commonly used file extension
  • FileType - Returns any file type available as mime-type
  • FileExt - Gets a random extension for the given mime type.
  • Semver - Get a random semver version string.
  • Version - Get a random System.Version
  • Exception - Get a random Exception with a fake stack trace.

• using Bogus.Extensions.Brazil;
  • Bogus.Person.Cpf() - Cadastro de Pessoas Físicas
  • Bogus.DataSets.Company.Cnpj() - Cadastro Nacional da Pessoa Jurídica
• using Bogus.Extensions.Canada;
  • Bogus.Person.Sin() - Social Insurance Number for Canada
• using Bogus.Extensions.Denmark;
  • Bogus.Person.Cpr() - Danish Personal Identification number
• using Bogus.Extensions.Finland;
  • Bogus.Person.Henkilötunnus() - Finnish Henkilötunnus
• using Bogus.Extensions.UnitedKingdom;
  • Bogus.DataSets.Finance.ShortCode() - Banking Short Code
• using Bogus.Extensions.UnitedStates;
  • Bogus.Person.Ssn() - Social Security Number

If you want to generate a Person with context relevant properties like an email that looks like it belongs to someone with the same first/last name, create a person!

[Test]
public void Create_Context_Related_Person()
{
    var person = new Bogus.Person();

    person.Dump();
}

/* OUTPUT:
{
  "FirstName": "Lee",
  "LastName": "Brown",
  "UserName": "Lee_Brown3",
  "Avatar": "https://s3.amazonaws.com/uifaces/faces/twitter/ccinojasso1/128.jpg",
  "Email": "Lee_Brown369@yahoo.com",
  "DateOfBirth": "1984-01-16T21:31:27.87666",
  "Address": {
    "Street": "2552 Bernard Rapid",
    "Suite": "Suite 199",
    "City": "New Haskell side",
    "ZipCode": "78425-0411",
    "Geo": {
      "Lat": -35.8154,
      "Lng": -140.2044
    }
  },
  "Phone": "1-500-790-8836 x5069",
  "Website": "javier.biz",
  "Company": {
    "Name": "Kuphal and Sons",
    "CatchPhrase": "Organic even-keeled monitoring",
    "Bs": "open-source brand e-business"
  }
} */

Replace a formatted string with random numbers #, letters ?, or * random number or letter:

[Test]
public void Create_an_SSN()
{
    var ssn = new Bogus.Randomizer().Replace("###-##-####");
    ssn.Dump();

    var code = new Randomizer().Replace("##? ??? ####");
    code.Dump();

    var serial = new Randomizer().Replace("**-****");
    code.Dump();
}
/* OUTPUT:
"618-19-3064"
"39E SPC 0790"
"L3-J9N5"
*/

You can also parse strings in the following format:

[Test]
public void Handlebar()
{
    var faker = new Faker();
    var randomName = faker.Parse("{{name.lastName}}, {{name.firstName}} {{name.suffix}}");
    randomName.Dump();
}

/* OUTPUT:
"Roob, Michale PhD"
*/

You can also use implicit type conversion to make your code look cleaner without having to explicitly call Faker<T>.Generate().

var orderFaker = new Faker<Order>()
                     .RuleFor(o => o.OrderId, f => f.IndexVariable++)
                     .RuleFor(o => o.Item, f => f.Commerce.Product())
                     .RuleFor(o => o.Quantity, f => f.Random.Number(1,3));

Order testOrder1 = orderFaker;
Order testOrder2 = orderFaker;
testOrder1.Dump();
testOrder2.Dump();

/* OUTPUT:
{
  "OrderId": 0,
  "Item": "Computer",
  "Quantity": 2
}
{
  "OrderId": 1,
  "Item": "Tuna",
  "Quantity": 3
}
*/

//Explicit works too!
var anotherOrder = (Order)orderFaker;

Sometimes writing .RuleFor(x => x.Prop, ...) can get repetitive, use the .Rules((f, t) => {...}) shortcut to specify rules in bulk as shown below:

public void create_rules_for_an_object_the_easy_way()
{
    var faker = new Faker<Order>()
        .StrictMode(false)
        .Rules((f, o) =>
            {
                o.Quantity = f.Random.Number(1, 4);
                o.Item = f.Commerce.Product();
                o.OrderId = 25;
            });
    Order o = faker.Generate();
}

Note: When using the bulk .Rules(...) action, StrictMode cannot be set to true since individual properties of type T cannot be indpendently checked to ensure each property has a rule.

open Bogus

type Customer() =
  member val FirstName = "" with get, set
  member val LastName = "" with get, set
  member val Age = 0 with get,set
  member val Title = "" with get,set

let faker = 
        Faker<Customer>()
          //Make a rule for each property
          .RuleFor( (fun c -> c.FirstName), fun (f:Faker) -> f.Name.FirstName() )
          .RuleFor( (fun c -> c.LastName), fun (f:Faker) -> f.Name.LastName() )

          //Or, alternatively, in bulk with .Rules()
          .Rules( fun f c -> 
                    c.Age <- f.Random.Int(18,35) 
                    c.Title <- f.Name.JobTitle() )
  
faker.Generate() |> Dump |> ignore

(* OUTPUT:
  FirstName: Jarrell
  LastName: Tremblay
  Age: 32
  Title: Senior Web Designer
*)

Imports Bogus

Public Class Customer
    Public Property FirstName() As String
    Public Property LastName() As String
    Public Property Age() As Integer
    Public Property Title() As String
End Class

Sub Main
    Dim faker As New Faker(Of Customer)
    
    '-- Make a rule for each property
    faker.RuleFor( Function(c) c.FirstName, Function(f) f.Name.FirstName) _
         .RuleFor( Function(c) c.LastName, Function(f) f.Name.LastName) _
         _
         .Rules( Sub(f, c)   '-- Or, alternatively, in bulk with .Rules() 
                   c.Age = f.Random.Int(18,35) 
                   c.Title = f.Name.JobTitle()
                 End Sub )
            
    faker.Generate.Dump
End Sub

' OUTPUT:
' FirstName: Jeremie 
' LastName: Mills 
' Age: 32 
' Title: Quality Supervisor 

• Download the source code.
• Run build.cmd.

Upon successful build, the results will be in the \__compile directory. The build.cmd compiles the C# code and embeds the locales in Source\Bogus\data. If you want to rebuild the NuGet packages run build.cmd pack and the NuGet packages will be in __package.

If you wish to re-bundle the latest faker.js locales, you'll need to first:

1. git submodule init
2. git submodule update
3. Ensure, NodeJS and gulp are properly installed.
4. cd Source\Builder
5. npm install to install required dev dependencies.
6. gulp import.locales to regenerate locales in Source\Bogus\data.
7. In solution explorer add any new locales not already included as an EmbeddedResource.
8. Finally, run build.cmd.

• MIT License

Created by Brian Chavez.

faker.js made possible by Matthew Bergman & Marak Squires.

A big thanks to GitHub and all contributors:

• Anton Georgiev
• Martijn Laarman
• Anrijs Vitolins
• Pi Lanningham
• JvanderStad
• Giuseppe Dimauro