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# Strfmt [](https://github.com/go-openapi/strfmt/actions?query=workflow%3A"go+test") [](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://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")
- ulid (e.g. "00000PP9HGSBSSDZ1JTEXBJ0PW", [spec](https://github.com/ulid/spec))
> 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
- [ULID](https://github.com/ulid/spec)