https://github.com/go-openapi/strfmt
openapi toolkit common string formats
https://github.com/go-openapi/strfmt
Last synced: 13 days ago
JSON representation
openapi toolkit common string formats
- Host: GitHub
- URL: https://github.com/go-openapi/strfmt
- Owner: go-openapi
- License: apache-2.0
- Created: 2016-04-17T07:44:41.000Z (about 10 years ago)
- Default Branch: master
- Last Pushed: 2026-05-30T18:15:52.000Z (14 days ago)
- Last Synced: 2026-05-30T20:10:35.810Z (14 days ago)
- Language: Go
- Homepage:
- Size: 544 KB
- Stars: 111
- Watchers: 8
- Forks: 66
- Open Issues: 7
-
Metadata Files:
- Readme: README.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
- Security: SECURITY.md
- Agents: AGENTS.md
Awesome Lists containing this project
README
# strfmt
[![Tests][test-badge]][test-url] [![Coverage][cov-badge]][cov-url] [![CI vuln scan][vuln-scan-badge]][vuln-scan-url] [![CodeQL][codeql-badge]][codeql-url]
[![Release][release-badge]][release-url] [![Go Report Card][gocard-badge]][gocard-url] [![CodeFactor Grade][codefactor-badge]][codefactor-url] [![License][license-badge]][license-url]
[![GoDoc][godoc-badge]][godoc-url] [![Discord Channel][discord-badge]][discord-url] [![go version][goversion-badge]][goversion-url] ![Top language][top-badge] ![Commits since latest release][commits-badge]
---
Golang support for string formats defined by JSON Schema and OpenAPI.
## Announcements
* **2026-03-07** : v0.26.0 **dropped dependency to the mongodb driver**
* mongodb users can still use this package without any change
* however, we have frozen the back-compatible support for mongodb driver at v2.5.0
* users who want to keep-up with future evolutions (possibly incompatible) of this driver
can do so by adding a blank import in their program: `import _ "github.com/go-openapi/strfmt/enable/mongodb"`.
This will switch the behavior to the actual driver, which remains regularly updated as an independent module.
## Status
API is stable.
## Import this library in your project
```cmd
go get github.com/go-openapi/strfmt
```
## Contents
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 hostname or email.
This package provides a few extra formats such as credit card (US), color, etc.
Format types can serialize and deserialize JSON or from a SQL database.
BSON is also supported (MongoDB).
### Supported 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, uuid7
- 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](https://www.rfc-editor.org/rfc/rfc9562.html#name-uuid-version-3)
- [UUID4](https://www.rfc-editor.org/rfc/rfc9562.html#name-uuid-version-4)
- [UUID5](https://www.rfc-editor.org/rfc/rfc9562.html#name-uuid-version-5)
- [UUID7](https://www.rfc-editor.org/rfc/rfc9562.html#name-uuid-version-7)
- [ULID](https://github.com/ulid/spec)
### Database support
All format types implement the `database/sql` interfaces `sql.Scanner` and `driver.Valuer`,
so they work out of the box with Go's standard `database/sql` package and any SQL driver.
All format types also implement BSON marshaling/unmarshaling for use with MongoDB.
By default, a built-in minimal codec is used (compatible with mongo-driver v2.5.0).
For full driver support, add `import _ "github.com/go-openapi/strfmt/enable/mongodb"`.
> **MySQL / MariaDB caveat for `DateTime`:**
> The `go-sql-driver/mysql` driver has hard-coded handling for `time.Time` but does not
> intercept type redefinitions like `strfmt.DateTime`. As a result, `DateTime.Value()` sends
> an RFC 3339 string (e.g. `"2024-06-15T12:30:45.123Z"`) that MySQL/MariaDB rejects for
> `DATETIME` columns.
>
> Workaround: set `strfmt.MarshalFormat` to a MySQL-compatible format such as
> `strfmt.ISO8601LocalTime` and normalize to UTC before marshaling:
>
> ```go
> strfmt.MarshalFormat = strfmt.ISO8601LocalTime
> strfmt.NormalizeTimeForMarshal = func(t time.Time) time.Time { return t.UTC() }
> ```
>
> See [#174](https://github.com/go-openapi/strfmt/issues/174) for details.
Integration tests for MongoDB, MariaDB, and PostgreSQL run in CI to verify database roundtrip
compatibility for all format types. See [`internal/testintegration/`](internal/testintegration/).
## Change log
See
## References
## Licensing
This library ships under the [SPDX-License-Identifier: Apache-2.0](./LICENSE).
## Other documentation
* [All-time contributors](./CONTRIBUTORS.md)
* [Contributing guidelines][contributing-doc-site]
* [Maintainers documentation][maintainers-doc-site]
* [Code style][style-doc-site]
## Cutting a new release
Maintainers can cut a new release by either:
* running [this workflow](https://github.com/go-openapi/strfmt/actions/workflows/bump-release.yml)
* or pushing a semver tag
* signed tags are preferred
* The tag message is prepended to release notes
[test-badge]: https://github.com/go-openapi/strfmt/actions/workflows/go-test.yml/badge.svg
[test-url]: https://github.com/go-openapi/strfmt/actions/workflows/go-test.yml
[cov-badge]: https://codecov.io/gh/go-openapi/strfmt/branch/master/graph/badge.svg
[cov-url]: https://codecov.io/gh/go-openapi/strfmt
[vuln-scan-badge]: https://github.com/go-openapi/strfmt/actions/workflows/scanner.yml/badge.svg
[vuln-scan-url]: https://github.com/go-openapi/strfmt/actions/workflows/scanner.yml
[codeql-badge]: https://github.com/go-openapi/strfmt/actions/workflows/codeql.yml/badge.svg
[codeql-url]: https://github.com/go-openapi/strfmt/actions/workflows/codeql.yml
[release-badge]: https://badge.fury.io/gh/go-openapi%2Fstrfmt.svg
[release-url]: https://badge.fury.io/gh/go-openapi%2Fstrfmt
[gomod-badge]: https://badge.fury.io/go/github.com%2Fgo-openapi%2Fstrfmt.svg
[gomod-url]: https://badge.fury.io/go/github.com%2Fgo-openapi%2Fstrfmt
[gocard-badge]: https://goreportcard.com/badge/github.com/go-openapi/strfmt
[gocard-url]: https://goreportcard.com/report/github.com/go-openapi/strfmt
[codefactor-badge]: https://img.shields.io/codefactor/grade/github/go-openapi/strfmt
[codefactor-url]: https://www.codefactor.io/repository/github/go-openapi/strfmt
[doc-badge]: https://img.shields.io/badge/doc-site-blue?link=https%3A%2F%2Fgoswagger.io%2Fgo-openapi%2F
[doc-url]: https://goswagger.io/go-openapi
[godoc-badge]: https://pkg.go.dev/badge/github.com/go-openapi/strfmt
[godoc-url]: http://pkg.go.dev/github.com/go-openapi/strfmt
[discord-badge]: https://img.shields.io/discord/1446918742398341256?logo=discord&label=discord&color=blue
[discord-url]: https://discord.gg/FfnFYaC3k5
[license-badge]: http://img.shields.io/badge/license-Apache%20v2-orange.svg
[license-url]: https://github.com/go-openapi/strfmt/?tab=Apache-2.0-1-ov-file#readme
[goversion-badge]: https://img.shields.io/github/go-mod/go-version/go-openapi/strfmt
[goversion-url]: https://github.com/go-openapi/strfmt/blob/master/go.mod
[top-badge]: https://img.shields.io/github/languages/top/go-openapi/strfmt
[commits-badge]: https://img.shields.io/github/commits-since/go-openapi/strfmt/latest
[contributing-doc-site]: https://go-openapi.github.io/doc-site/contributing/contributing/index.html
[maintainers-doc-site]: https://go-openapi.github.io/doc-site/maintainers/index.html
[style-doc-site]: https://go-openapi.github.io/doc-site/contributing/style/index.html