Gofakeit 
Random data generator written in go
Features
- 160+ Functions!!!
- Random Sources
- Global Rand
- Struct Generator
- Custom Functions
- Http Server
- Command Line Tool
- Zero dependencies
- Benchmarks
- Issue
Installation
go get github.com/brianvoe/gofakeit/v6Simple Usage
import "github.com/brianvoe/gofakeit/v6"
gofakeit.Name() // Markus Moen
gofakeit.Email() // [email protected]
gofakeit.Phone() // (570)245-7485
gofakeit.BS() // front-end
gofakeit.BeerName() // Duvel
gofakeit.Color() // MediumOrchid
gofakeit.Company() // Moen, Pagac and Wuckert
gofakeit.CreditCardNumber() // 4287271570245748
gofakeit.HackerPhrase() // Connecting the array won't do anything, we need to generate the haptic COM driver!
gofakeit.JobTitle() // Director
gofakeit.CurrencyShort() // USDSeed
If you are using the default global usage and dont care about seeding no need to set anything. Gofakeit will seed it with a cryptographically secure number.
If you need a reproducible outcome you can set it via the Seed function call. Every example in this repo sets it for testing purposes.
import "github.com/brianvoe/gofakeit/v6"
gofakeit.Seed(0) // If 0 will use crypto/rand to generate a number
// or
gofakeit.Seed(8675309) // Set it to whatever number you wantRandom Sources
Gofakeit has a few rand sources, by default it uses math.Rand and uses mutex locking to allow for safe goroutines.
If you want to use a more performant source please use NewUnlocked. Be aware that it is not goroutine safe.
import "github.com/brianvoe/gofakeit/v6"
// Uses math/rand(Pseudo) with mutex locking
faker := gofakeit.New(0)
// Uses math/rand(Pseudo) with NO mutext locking
// More performant but not goroutine safe.
faker := gofakeit.NewUnlocked(0)
// Uses crypto/rand(cryptographically secure) with mutext locking
faker := gofakeit.NewCrypto()
// Pass in your own random source
faker := gofakeit.NewCustom()Global Rand Set
If you would like to use the simple function calls but need to use something like crypto/rand you can override the default global with the random source that you want.
import "github.com/brianvoe/gofakeit/v6"
faker := gofakeit.NewCrypto()
gofakeit.SetGlobalFaker(faker)Struct
Gofakeit can generate random data for struct fields. For the most part it covers all the basic type as well as some non basic like time.Time.
Struct fields can also use tags to more specifically generate data for that field type.
import "github.com/brianvoe/gofakeit/v6"
// Create structs with random injected data
type Foo struct {
Str string
Int int
Pointer *int
Name string `fake:"{firstname}"` // Any available function all lowercase
Sentence string `fake:"{sentence:3}"` // Can call with parameters
RandStr string `fake:"{randomstring:[hello,world]}"`
Number string `fake:"{number:1,10}"` // Comma separated for multiple values
Regex string `fake:"{regex:[abcdef]{5}}"` // Generate string from regex
Map map[string]int `fakesize:"2"`
Array []string `fakesize:"2"`
Bar Bar
Skip *string `fake:"skip"` // Set to "skip" to not generate data for
Created time.Time // Can take in a fake tag as well as a format tag
CreatedFormat time.Time `fake:"{year}-{month}-{day}" format:"2006-01-02"`
}
type Bar struct {
Name string
Number int
Float float32
}
// Pass your struct as a pointer
var f Foo
gofakeit.Struct(&f)
fmt.Println(f.Str) // hrukpttuezptneuvunh
fmt.Println(f.Int) // -7825289004089916589
fmt.Println(*f.Pointer) // -343806609094473732
fmt.Println(f.Name) // fred
fmt.Println(f.Sentence) // Record river mind.
fmt.Println(f.RandStr) // world
fmt.Println(f.Number) // 4
fmt.Println(f.Regex) // cbdfc
fmt.Println(f.Map) // map[PxLIo:52 lxwnqhqc:846]
fmt.Println(f.Array) // cbdfc
fmt.Printf("%+v", f.Bar) // {Name:QFpZ Number:-2882647639396178786 Float:1.7636692e+37}
fmt.Println(f.Skip) // <nil>
fmt.Println(f.Created.String()) // 1908-12-07 04:14:25.685339029 +0000 UTC
// Supported formats
// int, int8, int16, int32, int64,
// uint, uint8, uint16, uint32, uint64,
// float32, float64,
// bool, string,
// array, pointers, map
// time.Time // If setting time you can also set a format tag
// Nested Struct Fields and Embeded FieldsCustom Functions
In a lot of sitations you may need to use your own random function usage for your specific needs.
If you would like to extend the usage of struct tags, generate function, available usages in the gofakeit server or gofakeit command sub packages. You can do so via the AddFuncLookup. Each function has their own lookup, if you need more reference examples you can look at each files lookups.
// Simple
gofakeit.AddFuncLookup("friendname", Info{
Category: "custom",
Description: "Random friend name",
Example: "bill",
Output: "string",
Generate: func(r *rand.Rand, m *MapParams, info *Info) (interface{}, error) {
return RandomString([]string{"bill", "bob", "sally"}), nil
},
})
// With Params
gofakeit.AddFuncLookup("jumbleword", Info{
Category: "jumbleword",
Description: "Take a word and jumple it up",
Example: "loredlowlh",
Output: "string",
Params: []Param{
{Field: "word", Type: "string", Description: "Word you want to jumble"},
},
Generate: func(r *rand.Rand, m *MapParams, info *Info) (interface{}, error) {
word, err := info.GetString(m, "word")
if err != nil {
return nil, err
}
split := strings.Split(word, "")
ShuffleStrings(split)
return strings.Join(split, ""), nil
},
})
type Foo struct {
FriendName string `fake:"{friendname}"`
JumbleWord string `fake:"{jumbleword:helloworld}"`
}
var f Foo
gofakeit.Struct(&f)
fmt.Printf("%s", f.FriendName) // bill
fmt.Printf("%s", f.JumbleWord) // loredlowlhFunctions
All functions also exist as methods on the Faker struct
File
JSON(jo *JSONOptions) ([]byte, error)
XML(xo *XMLOptions) ([]byte, error)
FileExtension() string
FileMimeType() stringPerson
Person() *PersonInfo
Name() string
NamePrefix() string
NameSuffix() string
FirstName() string
LastName() string
Gender() string
SSN() string
Contact() *ContactInfo
Email() string
Phone() string
PhoneFormatted() string
Teams(peopleArray []string, teamsArray []string) map[string][]stringGenerate
Struct(v interface{})
Slice(v interface{})
Map() map[string]interface{}
Generate(value string) string
Regex(value string) stringAuth
Username() string
Password(lower bool, upper bool, numeric bool, special bool, space bool, num int) stringAddress
Address() *AddressInfo
City() string
Country() string
CountryAbr() string
State() string
StateAbr() string
Street() string
StreetName() string
StreetNumber() string
StreetPrefix() string
StreetSuffix() string
Zip() string
Latitude() float64
LatitudeInRange(min, max float64) (float64, error)
Longitude() float64
LongitudeInRange(min, max float64) (float64, error)Game
Gamertag() stringBeer
BeerAlcohol() string
BeerBlg() string
BeerHop() string
BeerIbu() string
BeerMalt() string
BeerName() string
BeerStyle() string
BeerYeast() stringCar
Car() *CarInfo
CarMaker() string
CarModel() string
CarType() string
CarFuelType() string
CarTransmissionType() stringWords
Noun() string
Verb() string
Adverb() string
Preposition() string
Adjective() string
Word() string
Sentence(wordCount int) string
Paragraph(paragraphCount int, sentenceCount int, wordCount int, separator string) string
LoremIpsumWord() string
LoremIpsumSentence(wordCount int) string
LoremIpsumParagraph(paragraphCount int, sentenceCount int, wordCount int, separator string) string
Question() string
Quote() string
Phrase() stringFoods
Fruit() string
Vegetable() string
Breakfast() string
Lunch() string
Dinner() string
Snack() string
Dessert() stringMisc
Bool() bool
UUID() string
FlipACoin() string
ShuffleAnySlice(v interface{})Colors
Color() string
HexColor() string
RGBColor() []int
SafeColor() stringInternet
URL() string
DomainName() string
DomainSuffix() string
IPv4Address() string
IPv6Address() string
MacAddress() string
HTTPStatusCode() string
HTTPStatusCodeSimple() int
LogLevel(logType string) string
HTTPMethod() string
HTTPVersion() string
UserAgent() string
ChromeUserAgent() string
FirefoxUserAgent() string
OperaUserAgent() string
SafariUserAgent() stringDate/Time
Date() time.Time
DateRange(start, end time.Time) time.Time
NanoSecond() int
Second() int
Minute() int
Hour() int
Month() int
MonthString() string
Day() int
WeekDay() string
Year() int
TimeZone() string
TimeZoneAbv() string
TimeZoneFull() string
TimeZoneOffset() float32
TimeZoneRegion() stringPayment
Price(min, max float64) float64
CreditCard() *CreditCardInfo
CreditCardCvv() string
CreditCardExp() string
CreditCardNumber(*CreditCardOptions) string
CreditCardType() string
Currency() *CurrencyInfo
CurrencyLong() string
CurrencyShort() string
AchRouting() string
AchAccount() string
BitcoinAddress() string
BitcoinPrivateKey() stringCompany
BS() string
BuzzWord() string
Company() string
CompanySuffix() string
Job() *JobInfo
JobDescriptor() string
JobLevel() string
JobTitle() stringHacker
HackerAbbreviation() string
HackerAdjective() string
Hackeringverb() string
HackerNoun() string
HackerPhrase() string
HackerVerb() stringHipster
HipsterWord() string
HipsterSentence(wordCount int) string
HipsterParagraph(paragraphCount int, sentenceCount int, wordCount int, separator string) stringApp
AppName() string
AppVersion() string
AppAuthor() stringAnimal
PetName() string
Animal() string
AnimalType() string
FarmAnimal() string
Cat() string
Dog() stringEmoji
Emoji() string
EmojiDescription() string
EmojiCategory() string
EmojiAlias() string
EmojiTag() stringLanguage
Language() string
LanguageAbbreviation() string
ProgrammingLanguage() string
ProgrammingLanguageBest() stringNumber
Number(min int, max int) int
Int8() int8
Int16() int16
Int32() int32
Int64() int64
Uint8() uint8
Uint16() uint16
Uint32() uint32
Uint64() uint64
Float32() float32
Float32Range(min, max float32) float32
Float64() float64
Float64Range(min, max float64) float64
ShuffleInts(a []int)
RandomInt(i []int) int
HexUint8() string
HexUint16() string
HexUint32() string
HexUint64() string
HexUint128() string
HexUint256() stringString
Digit() string
DigitN(n uint) string
Letter() string
LetterN(n uint) string
Lexify(str string) string
Numerify(str string) string
ShuffleStrings(a []string)
RandomString(a []string) string