swag

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Swag converts Go annotations to Swagger Documentation 2.0. We've created a variety of plugins for popular Go web frameworks. This allows you to quickly integrate with an existing Go project (using Swagger UI).

Contents

• Getting started
• Supported Web Frameworks
• How to use it with Gin
• The swag formatter
• Implementation Status
• Declarative Comments Format
  • General API Info
  • API Operation
  • Security
• Examples
  • Descriptions over multiple lines
  • User defined structure with an array type
  • Function scoped struct declaration
  • Model composition in response
    • Add request headers
  • Add response headers
  • Use multiple path params
  • Example value of struct
  • SchemaExample of body
  • Description of struct
  • Use swaggertype tag to supported custom type
  • Use global overrides to support a custom type
  • Use swaggerignore tag to exclude a field
  • Add extension info to struct field
  • Rename model to display
  • How to use security annotations
  • Add a description for enum items
  • Generate only specific docs file types
  • How to use Go generic types
• About the Project

Getting started

1. Add comments to your API source code, See Declarative Comments Format.

2. Install swag by using:

go install github.com/swaggo/swag/cmd/swag@latest

To build from source you need Go (1.19 or newer).

Alternatively you can run the docker image:

docker run --rm -v $(pwd):/code ghcr.io/swaggo/swag:latest

Or download a pre-compiled binary from the release page.

3. Run swag init in the project's root folder which contains the main.go file. This will parse your comments and generate the required files (docs folder and docs/docs.go).

swag init

Make sure to import the generated docs/docs.go so that your specific configuration gets init'ed. If your General API annotations do not live in main.go, you can let swag know with -g flag.

import _ "example-module-name/docs"

swag init -g http/api.go

4. (optional) Use swag fmt format the SWAG comment. (Please upgrade to the latest version)

swag fmt

swag cli

swag init -h
NAME:
   swag init - Create docs.go

USAGE:
   swag init [command options] [arguments...]

OPTIONS:
   --quiet, -q                            Make the logger quiet. (default: false)
   --generalInfo value, -g value          Go file path in which 'swagger general API Info' is written (default: "main.go")
   --dir value, -d value                  Directories you want to parse,comma separated and general-info file must be in the first one (default: "./")
   --exclude value                        Exclude directories and files when searching, comma separated
   --propertyStrategy value, -p value     Property Naming Strategy like snakecase,camelcase,pascalcase (default: "camelcase")
   --output value, -o value               Output directory for all the generated files(swagger.json, swagger.yaml and docs.go) (default: "./docs")
   --outputTypes value, --ot value        Output types of generated files (docs.go, swagger.json, swagger.yaml) like go,json,yaml (default: "go,json,yaml")
   --parseVendor                          Parse go files in 'vendor' folder, disabled by default (default: false)
   --parseDependency, --pd                Parse go files inside dependency folder, disabled by default (default: false)
   --parseDependencyLevel, --pdl          Enhancement of '--parseDependency', parse go files inside dependency folder, 0 disabled, 1 only parse models, 2 only parse operations, 3 parse all (default: 0)
   --markdownFiles value, --md value      Parse folder containing markdown files to use as description, disabled by default
   --codeExampleFiles value, --cef value  Parse folder containing code example files to use for the x-codeSamples extension, disabled by default
   --parseInternal                        Parse go files in internal packages, disabled by default (default: false)
   --generatedTime                        Generate timestamp at the top of docs.go, disabled by default (default: false)
   --parseDepth value                     Dependency parse depth (default: 100)
   --requiredByDefault                    Set validation required for all fields by default (default: false)
   --instanceName value                   This parameter can be used to name different swagger document instances. It is optional.
   --overridesFile value                  File to read global type overrides from. (default: ".swaggo")
   --parseGoList                          Parse dependency via 'go list' (default: true)
   --tags value, -t value                 A comma-separated list of tags to filter the APIs for which the documentation is generated.Special case if the tag is prefixed with the '!' character then the APIs with that tag will be excluded
   --templateDelims value, --td value     Provide custom delimiters for Go template generation. The format is leftDelim,rightDelim. For example: "[[,]]"
   --collectionFormat value, --cf value   Set default collection format (default: "csv")
   --state value                          Initial state for the state machine (default: ""), @HostState in root file, @State in other files
   --parseFuncBody                        Parse API info within body of functions in go files, disabled by default (default: false)
   --help, -h                             show help (default: false)

swag fmt -h
NAME:
   swag fmt - format swag comments

USAGE:
   swag fmt [command options] [arguments...]

OPTIONS:
   --dir value, -d value          Directories you want to parse,comma separated and general-info file must be in the first one (default: "./")
   --exclude value                Exclude directories and files when searching, comma separated
   --generalInfo value, -g value  Go file path in which 'swagger general API Info' is written (default: "main.go")
   --help, -h                     show help (default: false)

Supported Web Frameworks

• gin
• echo
• buffalo
• net/http
• gorilla/mux
• go-chi/chi
• flamingo
• fiber
• atreugo
• hertz

How to use it with Gin

Find the example source code here.

Finish the steps in Getting started

1. After using swag init to generate Swagger 2.0 docs, import the following packages:

import "github.com/swaggo/gin-swagger" // gin-swagger middleware
import "github.com/swaggo/files" // swagger embed files

2. Add General API annotations in main.go code:

// @title           Swagger Example API
// @version         1.0
// @description     This is a sample server celler server.
// @termsOfService  http://swagger.io/terms/

// @contact.name   API Support
// @contact.url    http://www.swagger.io/support
// @contact.email  support@swagger.io

// @license.name  Apache 2.0
// @license.url   http://www.apache.org/licenses/LICENSE-2.0.html

// @host      localhost:8080
// @BasePath  /api/v1

// @securityDefinitions.basic  BasicAuth

// @externalDocs.description  OpenAPI
// @externalDocs.url          https://swagger.io/resources/open-api/
func main() {
	r := gin.Default()

	c := controller.NewController()

	v1 := r.Group("/api/v1")
	{
		accounts := v1.Group("/accounts")
		{
			accounts.GET(":id", c.