# Swag

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---

A bunch of helper functions for go-openapi and go-swagger projects.

You may also use it standalone for your projects.

> **NOTE**
> `swag` is one of the foundational building blocks of the go-openapi initiative.
>
> Most repositories in `github.com/go-openapi/...` depend on it in some way.
> And so does our CLI tool `github.com/go-swagger/go-swagger`,
> as well as the code generated by this tool.

* [Contents](#contents)
* [Dependencies](#dependencies)
* [Change log](#change-log)
* [Licensing](#licensing)
* [Note to contributors](#note-to-contributors)
* [Roadmap](#roadmap)

## Announcements

* **2025-12-19** : new community chat on discord
  * a new discord community channel is available to be notified of changes and support users
  * our venerable Slack channel remains open, and will be eventually discontinued on **2026-03-31**

You may join the discord community by clicking the invite link on the discord badge (also above). [![Discord Channel][discord-badge]][discord-url]

Or join our Slack channel: [![Slack Channel][slack-logo]![slack-badge]][slack-url]

## Status

API is stable.

## Import this library in your project

```cmd
go get github.com/go-openapi/swag/{module}
```

Or for backward compatibility:

```cmd
go get github.com/go-openapi/swag
```

## Contents

`go-openapi/swag` exposes a collection of relatively independent modules.

Moving forward, no additional feature will be added to the `swag` API directly at the root package level,
which remains there for backward-compatibility purposes. All exported top-level features are now deprecated.

Child modules will continue to evolve and some new ones may be added in the future.

| Module        | Content | Main features |
|---------------|---------|---------------|
| `cmdutils`     | utilities to work with CLIs ||
| `conv`        | type conversion utilities | convert between values and pointers for any types<br />convert from string to builtin types (wraps `strconv`)<br />require `./typeutils` (test dependency)<br /> |
| `fileutils`   | file utilities | |
| `jsonname`    | JSON utilities | infer JSON names from `go` properties<br /> |
| `jsonutils`   | JSON utilities | fast json concatenation<br />read and write JSON from and to dynamic `go` data structures<br />~require `github.com/mailru/easyjson`~<br /> |
| `loading`     | file loading | load from file or http<br />require `./yamlutils`<br /> |
| `mangling`    | safe name generation | name mangling for `go`<br /> |
| `netutils`    | networking utilities | host, port from address<br /> |
| `stringutils` | `string` utilities | search in slice (with case-insensitive)<br />split/join query parameters as arrays<br /> |
| `typeutils`   | `go` types utilities | check the zero value for any type<br />safe check for a nil value<br /> |
| `yamlutils`   | YAML utilities | converting YAML to JSON<br />loading YAML into a dynamic YAML document<br />maintaining the original order of keys in YAML objects<br />require `./jsonutils`<br />~require `github.com/mailru/easyjson`~<br />require `go.yaml.in/yaml/v3`<br /> |

---

## Dependencies

The root module `github.com/go-openapi/swag` at the repo level maintains a few
dependencies outside of the standard library.

* YAML utilities depend on `go.yaml.in/yaml/v3`
* JSON utilities depend on their registered adapter module:
    * by default, only the standard library is used
    * `github.com/mailru/easyjson` is now only a dependency for module
      `github.com/go-openapi/swag/jsonutils/adapters/easyjson/json`,
      for users willing to import that module.
    * integration tests and benchmarks use all the dependencies are published as their own module
* other dependencies are test dependencies drawn from `github.com/stretchr/testify`

## Usage

**How to explicitly register a dependency at runtime**?

The following would maintain how JSON utilities proposed by `swag` used work, up to `v0.24.1`.

  ```go
  import (
    "github.com/go-openapi/swag/jsonutils/adapters"
    easyjson "github.com/go-openapi/swag/jsonutils/adapters/easyjson/json"
  )

  func init() {
	  easyjson.Register(adapters.Registry)
  }
  ```

Subsequent calls to `jsonutils.ReadJSON()` or `jsonutils.WriteJSON()` will switch to `easyjson`
whenever the passed data structures implement the `easyjson.Unmarshaler` or `easyjson.Marshaler` respectively,
or fallback to the standard library.

For more details, you may also look at our
[integration tests](jsonutils/adapters/testintegration/integration_suite_test.go#29).

---

## Note to contributors

All kinds of contributions are welcome.

This repo is a go mono-repo. See [docs](docs/MAINTAINERS.md).

More general guidelines are available [here](.github/CONTRIBUTING.md).

## Roadmap

See the current [TODO list](docs/TODOS.md)

## Change log

See <https://github.com/go-openapi/swag/releases>

For pre-v0.26.0 releases, see [release notes](./docs/NOTES.md).

**What coming next?**

Moving forward, we want to :

* provide an implementation of the JSON adapter based on `encoding/json/v2`, for `go1.25` builds.
* provide similar implementations for `goccy/go-json` and `jsoniterator/go`, and perhaps some other
  similar libraries may be interesting too.

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## Licensing

This library ships under the [SPDX-License-Identifier: Apache-2.0](./LICENSE).

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## Limitations

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## Other documentation

* [All-time contributors](./CONTRIBUTORS.md)
* [Contributing guidelines](.github/CONTRIBUTING.md)
* [Maintainers documentation](docs/MAINTAINERS.md)
* [Code style](docs/STYLE.md)

## Cutting a new release

Maintainers can cut a new release by either:

* running [this workflow](https://github.com/go-openapi/swag/actions/workflows/bump-release.yml)
* or pushing a semver tag
  * signed tags are preferred
  * The tag message is prepended to release notes

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