# Strfmt [](https://travis-ci.org/go-openapi/strfmt) [](https://codecov.io/gh/go-openapi/strfmt) [](https://slackin.goswagger.io) [](https://raw.githubusercontent.com/go-openapi/strfmt/master/LICENSE) [](http://godoc.org/github.com/go-openapi/strfmt) [](https://golangci.com) [](https://goreportcard.com/report/github.com/go-openapi/strfmt) This package exposes a registry of data types to support string formats in the go-openapi toolkit. strfmt represents a well known string format such as credit card or email. The go toolkit for OpenAPI specifications knows how to deal with those. ## Supported data formats go-openapi/strfmt follows the swagger 2.0 specification with the following formats defined [here](https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md#data-types). It also provides convenient extensions to go-openapi users. - [x] JSON-schema draft 4 formats - date-time - email - hostname - ipv4 - ipv6 - uri - [x] swagger 2.0 format extensions - binary - byte (e.g. base64 encoded string) - date (e.g. "1970-01-01") - password - [x] go-openapi custom format extensions - bsonobjectid (BSON objectID) - creditcard - duration (e.g. "3 weeks", "1ms") - hexcolor (e.g. "#FFFFFF") - isbn, isbn10, isbn13 - mac (e.g "01:02:03:04:05:06") - rgbcolor (e.g. "rgb(100,100,100)") - ssn - uuid, uuid3, uuid4, uuid5 - cidr (e.g. "192.0.2.1/24", "2001:db8:a0b:12f0::1/32") > NOTE: as the name stands for, this package is intended to support string formatting only. > It does not provide validation for numerical values with swagger format extension for JSON types "number" or > "integer" (e.g. float, double, int32...). ## Type conversion All types defined here are stringers and may be converted to strings with `.String()`. Note that most types defined by this package may be converted directly to string like `string(Email{})`. `Date` and `DateTime` may be converted directly to `time.Time` like `time.Time(Time{})`. Similarly, you can convert `Duration` to `time.Duration` as in `time.Duration(Duration{})` ## Using pointers The `conv` subpackage provides helpers to convert the types to and from pointers, just like `go-openapi/swag` does with primitive types. ## Format types Types defined in strfmt expose marshaling and validation capabilities. List of defined types: - Base64 - CreditCard - Date - DateTime - Duration - Email - HexColor - Hostname - IPv4 - IPv6 - CIDR - ISBN - ISBN10 - ISBN13 - MAC - ObjectId - Password - RGBColor - SSN - URI - UUID - UUID3 - UUID4 - UUID5