ImageKit.io Go SDK

The ImageKit Go SDK is a comprehensive library designed to simplify the integration of ImageKit into your server-side applications. It provides powerful tools for working with the ImageKit REST API, including building and transforming URLs, generating signed URLs for secure content delivery, verifying webhooks, and handling file uploads.

The full API of this library can be found in api.md.

For additional details, refer to the ImageKit REST API documentation.

Installation

import (
	"github.com/imagekit-developer/imagekit-go/v2" // imported as imagekit
)

Or to pin the version:

go get -u 'github.com/imagekit-developer/imagekit-go@v2.0.0'

Requirements

This library requires Go 1.22+.

Usage

The full API of this library can be found in api.md.

package main

import (
	"context"
	"fmt"
	"os"

	"github.com/imagekit-developer/imagekit-go/v2"
	"github.com/imagekit-developer/imagekit-go/v2/option"
)

func main() {
	client := imagekit.NewClient(
		option.WithPrivateKey("private_key_xxx"), // defaults to os.LookupEnv("IMAGEKIT_PRIVATE_KEY")
	)
	
	file, err := os.Open("/path/to/your/image.jpg")
	if err != nil {
		panic(err.Error())
	}
	defer file.Close()
	
	response, err := client.Files.Upload(context.TODO(), imagekit.FileUploadParams{
		File:     file,
		FileName: "uploaded-image.jpg",
	})
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", response)
}

Request fields

The imagekit library uses the omitzero semantics from the Go 1.24+ encoding/json release for request fields.

Required primitive fields (int64, string, etc.) feature the tag `json:"...,required"`. These fields are always serialized, even their zero values.

Optional primitive types are wrapped in a param.Opt[T]. These fields can be set with the provided constructors, imagekit.String(string), imagekit.Int(int64), etc.

Any param.Opt[T], map, slice, struct or string enum uses the tag `json:"...,omitzero"`. Its zero value is considered omitted.

The param.IsOmitted(any) function can confirm the presence of any omitzero field.

p := imagekit.ExampleParams{
	ID:   "id_xxx",               // required property
	Name: imagekit.String("..."), // optional property

	Point: imagekit.Point{
		X: 0,               // required field will serialize as 0
		Y: imagekit.Int(1), // optional field will serialize as 1
		// ... omitted non-required fields will not be serialized
	},

	Origin: imagekit.Origin{}, // the zero value of [Origin] is considered omitted
}

To send null instead of a param.Opt[T], use param.Null[T](). To send null instead of a struct T, use param.NullStruct[T]().

p.Name = param.Null[string]()       // 'null' instead of string
p.Point = param.NullStruct[Point]() // 'null' instead of struct

param.IsNull(p.Name)  // true
param.IsNull(p.Point) // true

Request structs contain a .SetExtraFields(map[string]any) method which can send non-conforming fields in the request body. Extra fields overwrite any struct fields with a matching key. For security reasons, only use SetExtraFields with trusted data.

To send a custom value instead of a struct, use param.Override[T](value).

// In cases where the API specifies a given type,
// but you want to send something else, use [SetExtraFields]:
p.SetExtraFields(map[string]any{
	"x": 0.01, // send "x" as a float instead of int
})

// Send a number instead of an object
custom := param.Override[imagekit.FooParams](12)

Request unions

Unions are represented as a struct with fields prefixed by "Of" for each of it's variants, only one field can be non-zero. The non-zero field will be serialized.

Sub-properties of the union can be accessed via methods on the union struct. These methods return a mutable pointer to the underlying data, if present.

// Only one field can be non-zero, use param.IsOmitted() to check if a field is set
type AnimalUnionParam struct {
	OfCat *Cat `json:",omitzero,inline`
	OfDog *Dog `json:",omitzero,inline`
}

animal := AnimalUnionParam{
	OfCat: &Cat{
		Name: "Whiskers",
		Owner: PersonParam{
			Address: AddressParam{Street: "3333 Coyote Hill Rd", Zip: 0},
		},
	},
}

// Mutating a field
if address := animal.GetOwner().GetAddress(); address != nil {
	address.ZipCode = 94304
}

Response objects

All fields in response structs are ordinary value types (not pointers or wrappers). Response structs also include a special JSON field containing metadata about each property.

type Animal struct {
	Name   string `json:"name,nullable"`
	Owners int    `json:"owners"`
	Age    int    `json:"age"`
	JSON   struct {
		Name        respjson.Field
		Owner       respjson.Field
		Age         respjson.Field
		ExtraFields map[string]respjson.Field
	} `json:"-"`
}

To handle optional data, use the .Valid() method on the JSON field. .Valid() returns true if a field is not null, not present, or couldn't be marshaled.

If .Valid() is false, the corresponding field will simply be its zero value.

raw := `{"owners": 1, "name": null}`

var res Animal
json.Unmarshal([]byte(raw), &res)

// Accessing regular fields

res.Owners // 1
res.Name   // ""
res.Age    // 0

// Optional field checks

res.JSON.Owners.Valid() // true
res.JSON.Name.Valid()   // false
res.JSON.Age.Valid()    // false

// Raw JSON values

res.JSON.Owners.Raw()                  // "1"
res.JSON.Name.Raw() == "null"          // true
res.JSON.Name.Raw() == respjson.Null   // true
res.JSON.Age.Raw() == ""               // true
res.JSON.Age.Raw() == respjson.Omitted // true

These .JSON structs also include an ExtraFields map containing any properties in the json response that were not specified in the struct. This can be useful for API features not yet present in the SDK.

body := res.JSON.ExtraFields["my_unexpected_field"].Raw()

Response Unions

In responses, unions are represented by a flattened struct containing all possible fields from each of the object variants. To convert it to a variant use the .AsFooVariant() method or the .AsAny() method if present.

If a response value union contains primitive values, primitive fields will be alongside the properties but prefixed with Of and feature the tag json:"...,inline".

type AnimalUnion struct {
	// From variants [Dog], [Cat]
	Owner Person `json:"owner"`
	// From variant [Dog]
	DogBreed string `json:"dog_breed"`
	// From variant [Cat]
	CatBreed string `json:"cat_breed"`
	// ...

	JSON struct {
		Owner respjson.Field
		// ...
	} `json:"-"`
}

// If animal variant
if animal.Owner.Address.ZipCode == "" {
	panic("missing zip code")
}

// Switch on the variant
switch variant := animal.AsAny().(type) {
case Dog:
case Cat:
default:
	panic("unexpected type")
}

RequestOptions

This library uses the functional options pattern. Functions defined in the option package return a RequestOption, which is a closure that mutates a RequestConfig. These options can be supplied to the client or at individual requests. For example:

client := imagekit.NewClient(
	// Adds a header to every request made by the client
	option.WithHeader("X-Some-Header", "custom_header_info"),
)

client.Files.Upload(context.TODO(), ...,
	// Override the header
	option.WithHeader("X-Some-Header", "some_other_custom_header_info"),
	// Add an undocumented field to the request body, using sjson syntax
	option.WithJSONSet("some.json.path", map[string]string{"my": "object"}),
)

The request option option.WithDebugLog(nil) may be helpful while debugging.

See the full list of request options.

URL generation

The ImageKit SDK provides a powerful Helper.BuildURL() method for generating optimized image and video URLs with transformations. Here are examples ranging from simple URLs to complex transformations with overlays and signed URLs.

Basic URL generation

Generate a simple URL without any transformations:

package main

import (
	"fmt"
	
	"github.com/imagekit-developer/imagekit-go/v2"
	"github.com/imagekit-developer/imagekit-go/v2/option"
	"github.com/imagekit-developer/imagekit-go/v2/shared"
)

func main() {
	client := imagekit.NewClient(
		option.WithPrivateKey("private_key_xxx"),
	)

	// Basic URL without transformations
	url := client.Helper.BuildURL(shared.SrcOptionsParam{
		URLEndpoint: "https://ik.imagekit.io/your_imagekit_id",
		Src:         "/path/to/image.jpg",
	})
	fmt.Println(url)
	// Result: https://ik.imagekit.io/your_imagekit_id/path/to/image.jpg
}

URL generation with transformations

Apply common transformations like resizing, cropping, and format conversion:

package main

import (
	"fmt"
	
	"github.com/imagekit-developer/imagekit-go/v2"
	"github.com/imagekit-developer/imagekit-go/v2/option"
	"github.com/imagekit-developer/imagekit-go/v2/packages/param"
	"github.com/imagekit-developer/imagekit-go/v2/shared"
)

func main() {
	client := imagekit.NewClient(
		option.WithPrivateKey("private_key_xxx"),
	)

	// URL with basic transformations
	url := client.Helper.BuildURL(shared.SrcOptionsParam{
		URLEndpoint: "https://ik.imagekit.io/your_imagekit_id",
		Src:         "/path/to/image.jpg",
		Transformation: []shared.TransformationParam{
			{
				Width: shared.TransformationWidthUnionParam{
					OfFloat: param.Opt[float64]{Value: 400},
				},
				Height: shared.TransformationHeightUnionParam{
					OfFloat: param.Opt[float64]{Value: 300},
				},
				Crop:    shared.TransformationCropMaintainRatio,
				Quality:  param.Opt[float64]{Value: 80},
				Format:   shared.TransformationFormatWebp,
			},
		},
	})
	fmt.Println(url)
	// Result: https://ik.imagekit.io/your_imagekit_id/path/to/image.jpg?tr=w-400,h-300,c-maintain_ratio,q-80,f-webp
}

URL generation with image overlay

Add image overlays to your base image:

package main

import (
	"fmt"
	
	"github.com/imagekit-developer/imagekit-go/v2"
	"github.com/imagekit-developer/imagekit-go/v2/option"
	"github.com/imagekit-developer/imagekit-go/v2/packages/param"
	"github.com/imagekit-developer/imagekit-go/v2/shared"
	"github.com/imagekit-developer/imagekit-go/v2/shared/constant"
)

func main() {
	client := imagekit.NewClient(
		option.WithPrivateKey("private_key_xxx"),
	)

	// URL with image overlay
	url := client.Helper.BuildURL(shared.SrcOptionsParam{
		URLEndpoint: "https://ik.imagekit.io/your_imagekit_id",
		Src:         "/path/to/base-image.jpg",
		Transformation: []shared.TransformationParam{
			{
				Width: shared.TransformationWidthUnionParam{
					OfFloat: param.Opt[float64]{Value: 500},
				},
				Height: shared.TransformationHeightUnionParam{
					OfFloat: param.Opt[float64]{Value: 400},
				},
				Overlay: shared.OverlayUnionParam{
					OfImage: &shared.ImageOverlayParam{
						Type:  constant.Image("image"),
						Input: "/path/to/overlay-logo.png",
						BaseOverlayParam: shared.BaseOverlayParam{
							Position: shared.OverlayPositionParam{
								X: shared.OverlayPositionXUnionParam{
									OfFloat: param.Opt[float64]{Value: 10},
								},
								Y: shared.OverlayPositionYUnionParam{
									OfFloat: param.Opt[float64]{Value: 10},
								},
							},
						},
						Transformation: []shared.TransformationParam{
							{
								Width: shared.TransformationWidthUnionParam{
									OfFloat: param.Opt[float64]{Value: 100},
								},
								Height: shared.TransformationHeightUnionParam{
									OfFloat: param.Opt[float64]{Value: 50},
								},
							},
						},
					},
				},
			},
		},
	})
	fmt.Println(url)
	// Result: URL with image overlay positioned at x:10, y:10
}

URL generation with text overlay

Add customized text overlays:

package main

import (
	"fmt"
	
	"github.com/imagekit-developer/imagekit-go/v2"
	"github.com/imagekit-developer/imagekit-go/v2/option"
	"github.com/imagekit-developer/imagekit-go/v2/packages/param"
	"github.com/imagekit-developer/imagekit-go/v2/shared"
	"github.com/imagekit-developer/imagekit-go/v2/shared/constant"
)

func main() {
	client := imagekit.NewClient(
		option.WithPrivateKey("private_key_xxx"),
	)

	// URL with text overlay
	url := client.Helper.BuildURL(shared.SrcOptionsParam{
		URLEndpoint: "https://ik.imagekit.io/your_imagekit_id",
		Src:         "/path/to/base-image.jpg",
		Transformation: []shared.TransformationParam{
			{
				Width: shared.TransformationWidthUnionParam{
					OfFloat: param.Opt[float64]{Value: 600},
				},
				Height: shared.TransformationHeightUnionParam{
					OfFloat: param.Opt[float64]{Value: 400},
				},
				Overlay: shared.OverlayUnionParam{
					OfText: &shared.TextOverlayParam{
						Type: constant.Text("text"),
						Text: "Sample Text Overlay",
						BaseOverlayParam: shared.BaseOverlayParam{
							Position: shared.OverlayPositionParam{
								X: shared.OverlayPositionXUnionParam{
									OfFloat: param.Opt[float64]{Value: 50},
								},
								Y: shared.OverlayPositionYUnionParam{
									OfFloat: param.Opt[float64]{Value: 50},
								},
								Focus: shared.OverlayPositionFocusCenter,
							},
						},
						Transformation: []shared.TextOverlayTransformationParam{
							{
								FontSize: shared.TextOverlayTransformationFontSizeUnionParam{
									OfFloat: param.Opt[float64]{Value: 40},
								},
								FontFamily: param.Opt[string]{Value: "Arial"},
								FontColor:  param.Opt[string]{Value: "FFFFFF"},
								Typography: param.Opt[string]{Value: "b"}, // bold
							},
						},
					},
				},
			},
		},
	})
	fmt.Println(url)
	// Result: URL with bold white Arial text overlay at center position
}

URL generation with multiple overlays

Combine multiple overlays for complex compositions:

package main

import (
	"fmt"
	
	"github.com/imagekit-developer/imagekit-go/v2"
	"github.com/imagekit-developer/imagekit-go/v2/option"
	"github.com/imagekit-developer/imagekit-go/v2/packages/param"
	"github.com/imagekit-developer/imagekit-go/v2/shared"
	"github.com/imagekit-developer/imagekit-go/v2/shared/constant"
)

func main() {
	client := imagekit.NewClient(
		option.WithPrivateKey("private_key_xxx"),
	)

	// URL with multiple overlays (text + image)
	url := client.Helper.BuildURL(shared.SrcOptionsParam{
		URLEndpoint: "https://ik.imagekit.io/your_imagekit_id",
		Src:         "/path/to/base-image.jpg",
		Transformation: []shared.TransformationParam{
			{
				Width: shared.TransformationWidthUnionParam{
					OfFloat: param.Opt[float64]{Value: 800},
				},
				Height: shared.TransformationHeightUnionParam{
					OfFloat: param.Opt[float64]{Value: 600},
				},
				Overlay: shared.OverlayUnionParam{
					OfText: &shared.TextOverlayParam{
						Type: constant.Text("text"),
						Text: "Header Text",
						BaseOverlayParam: shared.BaseOverlayParam{
							Position: shared.OverlayPositionParam{
								X: shared.OverlayPositionXUnionParam{
									OfFloat: param.Opt[float64]{Value: 20},
								},
								Y: shared.OverlayPositionYUnionParam{
									OfFloat: param.Opt[float64]{Value: 20},
								},
							},
						},
						Transformation: []shared.TextOverlayTransformationParam{
							{
								FontSize: shared.TextOverlayTransformationFontSizeUnionParam{
									OfFloat: param.Opt[float64]{Value: 30},
								},
								FontColor: param.Opt[string]{Value: "000000"},
							},
						},
					},
				},
			},
			{
				Overlay: shared.OverlayUnionParam{
					OfImage: &shared.ImageOverlayParam{
						Type:  constant.Image("image"),
						Input: "/watermark.png",
						BaseOverlayParam: shared.BaseOverlayParam{
							Position: shared.OverlayPositionParam{
								Focus: shared.OverlayPositionFocusBottomRight,
							},
						},
						Transformation: []shared.TransformationParam{
							{
								Width: shared.TransformationWidthUnionParam{
									OfFloat: param.Opt[float64]{Value: 100},
								},
								Opacity: param.Opt[float64]{Value: 70},
							},
						},
					},
				},
			},
		},
	})
	fmt.Println(url)
	// Result: URL with text overlay at top-left and semi-transparent watermark at bottom-right
}

Signed URLs for secure delivery

Generate signed URLs that expire after a specified time for secure content delivery:

package main

import (
	"fmt"
	
	"github.com/imagekit-developer/imagekit-go/v2"
	"github.com/imagekit-developer/imagekit-go/v2/option"
	"github.com/imagekit-developer/imagekit-go/v2/packages/param"
	"github.com/imagekit-developer/imagekit-go/v2/shared"
)

func main() {
	client := imagekit.NewClient(
		option.WithPrivateKey("private_key_xxx"),
	)

	// Generate a signed URL that expires in 1 hour (3600 seconds)
	url := client.Helper.BuildURL(shared.SrcOptionsParam{
		URLEndpoint: "https://ik.imagekit.io/your_imagekit_id",
		Src:         "/private/secure-image.jpg",
		Transformation: []shared.TransformationParam{
			{
				Width: shared.TransformationWidthUnionParam{
					OfFloat: param.Opt[float64]{Value: 400},
				},
				Height: shared.TransformationHeightUnionParam{
					OfFloat: param.Opt[float64]{Value: 300},
				},
				Quality: param.Opt[float64]{Value: 90},
			},
		},
		Signed:    param.Opt[bool]{Value: true},
		ExpiresIn: param.Opt[float64]{Value: 3600}, // URL expires in 1 hour
	})
	fmt.Println(url)
	// Result: URL with signature parameters (?ik-t=timestamp&ik-s=signature)

	// Generate a signed URL that doesn't expire
	permanentSignedUrl := client.Helper.BuildURL(shared.SrcOptionsParam{
		URLEndpoint: "https://ik.imagekit.io/your_imagekit_id",
		Src:         "/private/secure-image.jpg",
		Signed:      param.Opt[bool]{Value: true},
		// No ExpiresIn means the URL won't expire
	})
	fmt.Println(permanentSignedUrl)
	// Result: URL with signature parameter (?ik-s=signature)
}

Using Raw transformations for undocumented features

ImageKit frequently adds new transformation parameters that might not yet be documented in the SDK. You can use the Raw parameter to access these features or create custom transformation strings:

package main

import (
	"fmt"
	
	"github.com/imagekit-developer/imagekit-go/v2"
	"github.com/imagekit-developer/imagekit-go/v2/option"
	"github.com/imagekit-developer/imagekit-go/v2/packages/param"
	"github.com/imagekit-developer/imagekit-go/v2/shared"
)

func main() {
	client := imagekit.NewClient(
		option.WithPrivateKey("private_key_xxx"),
	)

	// Using Raw transformation for undocumented or new parameters
	url := client.Helper.BuildURL(shared.SrcOptionsParam{
		URLEndpoint: "https://ik.imagekit.io/your_imagekit_id",
		Src:         "/path/to/image.jpg",
		Transformation: []shared.TransformationParam{
			{
				// Combine documented transformations with raw parameters
				Width: shared.TransformationWidthUnionParam{
					OfFloat: param.Opt[float64]{Value: 400},
				},
				Height: shared.TransformationHeightUnionParam{
					OfFloat: param.Opt[float64]{Value: 300},
				},
			},
			{
				// Use Raw for undocumented transformations or complex parameters
				Raw: param.Opt[string]{Value: "something-new"},
			},
		},
	})
	fmt.Println(url)
	// Result: https://ik.imagekit.io/your_imagekit_id/path/to/image.jpg?tr=w-400,h-300:something-new
}

Authentication parameters for client-side uploads

Generate authentication parameters for secure client-side file uploads:

package main

import (
	"fmt"
	
	"github.com/imagekit-developer/imagekit-go/v2"
	"github.com/imagekit-developer/imagekit-go/v2/option"
)

func main() {
	client := imagekit.NewClient(
		option.WithPrivateKey("private_key_xxx"),
	)

	// Generate authentication parameters for client-side uploads
	authParams := client.Helper.GetAuthenticationParameters("", 0)
	fmt.Printf("%+v\n", authParams)
	// Result: map[expire:<timestamp> signature:<hmac-signature> token:<uuid-token>]

	// Generate with custom token and expiry
	customAuthParams := client.Helper.GetAuthenticationParameters("my-custom-token", 1800)
	fmt.Printf("%+v\n", customAuthParams)
	// Result: map[expire:1800 signature:<hmac-signature> token:my-custom-token]
}

These authentication parameters can be used in client-side upload forms to securely upload files without exposing your private API key.

Webhook verification

The ImageKit SDK provides utilities to verify webhook signatures for secure event handling. This ensures that webhook requests are actually coming from ImageKit and haven't been tampered with.

Verifying webhook signatures

package main

import (
	"fmt"
	"io"
	"log"
	"net/http"
	"os"

	"github.com/imagekit-developer/imagekit-go/v2"
	"github.com/imagekit-developer/imagekit-go/v2/option"
)

func main() {
	client := imagekit.NewClient(
		option.WithPrivateKey("your_private_key"),
		option.WithWebhookSecret("whsec_..."), // Copy from ImageKit dashboard
	)

	// Webhook handler with proper request body handling
	http.HandleFunc("/webhook", func(w http.ResponseWriter, req *http.Request) {
		// Limit request body size to prevent abuse (64KB should be sufficient for most webhooks)
		const MaxBodyBytes = int64(65536)
		req.Body = http.MaxBytesReader(w, req.Body, MaxBodyBytes)
		
		// Read the raw webhook payload
		payload, err := io.ReadAll(req.Body)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Error reading request body: %v\n", err)
			w.WriteHeader(http.StatusServiceUnavailable)
			return
		}

		// Verify and unwrap webhook payload
		event, err := client.Webhooks.Unwrap(payload, req.Header)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Invalid webhook signature or malformed payload: %v\n", err)
			w.WriteHeader(http.StatusUnauthorized)
			return
		}

		fmt.Printf("Verified webhook event: %s\n", event.Type)
		
		// Handle different event types with full type safety
		switch event.Type {
		case "video.transformation.accepted":
			videoEvent := event.AsVideoTransformationAcceptedEvent()
			fmt.Printf("Video transformation accepted: %s\n", videoEvent.Data.Asset.URL)
			// Debugging: Track transformation requests
			// handleVideoTransformationAccepted(videoEvent)
			
		case "video.transformation.ready":
			videoEvent := event.AsVideoTransformationReadyEvent()
			fmt.Printf("Video transformation ready: %s\n", videoEvent.Data.Transformation.Output.URL)
			// Update your database/CMS to show the transformed video
			// handleVideoTransformationReady(videoEvent)
			
		case "video.transformation.error":
			videoEvent := event.AsVideoTransformationErrorEvent()
			fmt.Printf("Video transformation error: %s\n", videoEvent.Data.Transformation.Error.Reason)
			// Log error and check your origin/URL endpoint settings
			// handleVideoTransformationError(videoEvent)
			
		case "upload.pre-transform.success":
			uploadEvent := event.AsUploadPreTransformSuccessEvent()
			fmt.Printf("Pre-transform success: %s\n", uploadEvent.Data.FileID)
			// File uploaded and pre-transformation completed
			// handleUploadPreTransformSuccess(uploadEvent)
			
		case "upload.post-transform.success":
			postEvent := event.AsUploadPostTransformSuccessEvent()
			fmt.Printf("Post-transform success: %s\n", postEvent.Data.Name)
			// Additional transformation completed
			// handleUploadPostTransformSuccess(postEvent)
			
		// Handle other event types as needed
		default:
			fmt.Printf("Unhandled event type: %s\n", event.Type)
		}

		w.WriteHeader(http.StatusOK)
	})

	// Start the server
	fmt.Println("Webhook server listening on :8080")
	log.Fatal(http.ListenAndServe(":8080", nil))
}

For detailed information about webhook setup, signature verification, and handling different webhook events, refer to the ImageKit webhook documentation.

Errors

When the API returns a non-success status code, we return an error with type *imagekit.Error. This contains the StatusCode, *http.Request, and *http.Response values of the request, as well as the JSON of the error body (much like other response objects in the SDK).

To handle errors, we recommend that you use the errors.As pattern:

file, err := os.Open("/path/to/your/image.jpg")
if err != nil {
	panic(err.Error())
}
defer file.Close()

_, err = client.Files.Upload(context.TODO(), imagekit.FileUploadParams{
	File:     file,
	FileName: "uploaded-image.jpg",
})
if err != nil {
	var apierr *imagekit.Error
	if errors.As(err, &apierr) {
		println(string(apierr.DumpRequest(true)))  // Prints the serialized HTTP request
		println(string(apierr.DumpResponse(true))) // Prints the serialized HTTP response
	}
	panic(err.Error()) // GET "/api/v1/files/upload": 400 Bad Request { ... }
}

When other errors occur, they are returned unwrapped; for example, if HTTP transport fails, you might receive *url.Error wrapping *net.OpError.

Timeouts

Requests do not time out by default; use context to configure a timeout for a request lifecycle.

Note that if a request is retried, the context timeout does not start over. To set a per-retry timeout, use option.WithRequestTimeout().

// This sets the timeout for the request, including all the retries.
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
defer cancel()

file, err := os.Open("/path/to/your/image.jpg")
if err != nil {
	panic(err.Error())
}
defer file.Close()

client.Files.Upload(
	ctx,
	imagekit.FileUploadParams{
		File:     file,
		FileName: "uploaded-image.jpg",
	},
	// This sets the per-retry timeout
	option.WithRequestTimeout(20*time.Second),
)

File uploads

Request parameters that correspond to file uploads in multipart requests are typed as io.Reader. The contents of the io.Reader will by default be sent as a multipart form part with the file name of "anonymous_file" and content-type of "application/octet-stream".

The file name and content-type can be customized by implementing Name() string or ContentType() string on the run-time type of io.Reader. Note that os.File implements Name() string, so a file returned by os.Open will be sent with the file name on disk.

We also provide a helper imagekit.NewFile(reader io.Reader, filename string, contentType string) which can be used to wrap any io.Reader with the appropriate file name and content type.

Here are common file upload patterns:

// Upload from local file system
file, err := os.Open("/path/to/your/image.jpg")
if err != nil {
	panic(err.Error())
}
defer file.Close()

response, err := client.Files.Upload(context.TODO(), imagekit.FileUploadParams{
	File:     file,
	FileName: "uploaded-image.jpg",
})

// Upload from remote URL
resp, err := http.Get("https://example.com/remote-image.jpg")
if err != nil {
	panic(err.Error())
}
defer resp.Body.Close()

if resp.StatusCode != http.StatusOK {
	panic("Failed to fetch remote image")
}

response, err := client.Files.Upload(context.TODO(), imagekit.FileUploadParams{
	File:     resp.Body,
	FileName: "remote-image.jpg",
})

// Upload from binary data
imageData := []byte{/* your binary data */}
response, err := client.Files.Upload(context.TODO(), imagekit.FileUploadParams{
	File:     bytes.NewReader(imageData),
	FileName: "binary-upload.jpg",
})

// Upload with custom content type
response, err := client.Files.Upload(context.TODO(), imagekit.FileUploadParams{
	File:     imagekit.NewFile(bytes.NewReader(imageData), "custom.jpg", "image/jpeg"),
	FileName: "custom-upload.jpg",
})

Retries

Certain errors will be automatically retried 2 times by default, with a short exponential backoff. We retry by default all connection errors, 408 Request Timeout, 409 Conflict, 429 Rate Limit, and >=500 Internal errors.

You can use the WithMaxRetries option to configure or disable this:

// Configure the default for all requests:
client := imagekit.NewClient(
	option.WithMaxRetries(0), // default is 2
)

// Override per-request:
file, err := os.Open("/path/to/your/image.jpg")
if err != nil {
	panic(err.Error())
}
defer file.Close()

client.Files.Upload(
	context.TODO(),
	imagekit.FileUploadParams{
		File:     file,
		FileName: "uploaded-image.jpg",
	},
	option.WithMaxRetries(5),
)

Accessing raw response data (e.g. response headers)

You can access the raw HTTP response data by using the option.WithResponseInto() request option. This is useful when you need to examine response headers, status codes, or other details.

// Create a variable to store the HTTP response
var response *http.Response

file, err := os.Open("/path/to/your/image.jpg")
if err != nil {
	panic(err.Error())
}
defer file.Close()

response, err = client.Files.Upload(
	context.TODO(),
	imagekit.FileUploadParams{
		File:     file,
		FileName: "uploaded-image.jpg",
	},
	option.WithResponseInto(&response),
)
if err != nil {
	// handle error
}
fmt.Printf("%+v\n", response)

fmt.Printf("Status Code: %d\n", response.StatusCode)
fmt.Printf("Headers: %+#v\n", response.Header)

Making custom/undocumented requests

This library is typed for convenient access to the documented API. If you need to access undocumented endpoints, params, or response properties, the library can still be used.

Undocumented endpoints

To make requests to undocumented endpoints, you can use client.Get, client.Post, and other HTTP verbs. RequestOptions on the client, such as retries, will be respected when making these requests.

var (
    // params can be an io.Reader, a []byte, an encoding/json serializable object,
    // or a "…Params" struct defined in this library.
    params map[string]any

    // result can be an []byte, *http.Response, a encoding/json deserializable object,
    // or a model defined in this library.
    result *http.Response
)
err := client.Post(context.Background(), "/unspecified", params, &result)
if err != nil {
    …
}

Undocumented request params

To make requests using undocumented parameters, you may use either the option.WithQuerySet() or the option.WithJSONSet() methods.

params := FooNewParams{
    ID:   "id_xxxx",
    Data: FooNewParamsData{
        FirstName: imagekit.String("John"),
    },
}
client.Foo.New(context.Background(), params, option.WithJSONSet("data.last_name", "Doe"))

Undocumented response properties

To access undocumented response properties, you may either access the raw JSON of the response as a string with result.JSON.RawJSON(), or get the raw JSON of a particular field on the result with result.JSON.Foo.Raw().

Any fields that are not present on the response struct will be saved and can be accessed by result.JSON.ExtraFields() which returns the extra fields as a map[string]Field.

Middleware

We provide option.WithMiddleware which applies the given middleware to requests.

func Logger(req *http.Request, next option.MiddlewareNext) (res *http.Response, err error) {
	// Before the request
	start := time.Now()
	LogReq(req)

	// Forward the request to the next handler
	res, err = next(req)

	// Handle stuff after the request
	end := time.Now()
	LogRes(res, err, start - end)

    return res, err
}

client := imagekit.NewClient(
	option.WithMiddleware(Logger),
)

When multiple middlewares are provided as variadic arguments, the middlewares are applied left to right. If option.WithMiddleware is given multiple times, for example first in the client then the method, the middleware in the client will run first and the middleware given in the method will run next.

You may also replace the default http.Client with option.WithHTTPClient(client). Only one http client is accepted (this overwrites any previous client) and receives requests after any middleware has been applied.

Semantic versioning

This package generally follows SemVer conventions, though certain backwards-incompatible changes may be released as minor versions:

Changes to library internals which are technically public but not intended or documented for external use. (Please open a GitHub issue to let us know if you are relying on such internals.)
Changes that we do not expect to impact the vast majority of users in practice.

We take backwards-compatibility seriously and work hard to ensure you can rely on a smooth upgrade experience.

We are keen for your feedback; please open an issue with questions, bugs, or suggestions.

Contributing

See the contributing documentation.

Name		Name	Last commit message	Last commit date
Latest commit History 206 Commits
.devcontainer		.devcontainer
.github/workflows		.github/workflows
examples		examples
internal		internal
lib		lib
option		option
packages		packages
scripts		scripts
shared		shared
tests		tests
.gitignore		.gitignore
.release-please-manifest.json		.release-please-manifest.json
.stats.yml		.stats.yml
Brewfile		Brewfile
CHANGELOG.md		CHANGELOG.md
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
README.md		README.md
SECURITY.md		SECURITY.md
account.go		account.go
accountorigin.go		accountorigin.go
accountorigin_test.go		accountorigin_test.go
accounturlendpoint.go		accounturlendpoint.go
accounturlendpoint_test.go		accounturlendpoint_test.go
accountusage.go		accountusage.go
accountusage_test.go		accountusage_test.go
aliases.go		aliases.go
api.md		api.md
asset.go		asset.go
asset_test.go		asset_test.go
beta.go		beta.go
betav2.go		betav2.go
betav2file.go		betav2file.go
betav2file_test.go		betav2file_test.go
cache.go		cache.go
cacheinvalidation.go		cacheinvalidation.go
cacheinvalidation_test.go		cacheinvalidation_test.go
client.go		client.go
client_test.go		client_test.go
custommetadatafield.go		custommetadatafield.go
custommetadatafield_test.go		custommetadatafield_test.go
dummy.go		dummy.go
dummy_test.go		dummy_test.go
field.go		field.go
file.go		file.go
file_test.go		file_test.go
filebulk.go		filebulk.go
filebulk_test.go		filebulk_test.go
filemetadata.go		filemetadata.go
filemetadata_test.go		filemetadata_test.go
fileversion.go		fileversion.go
fileversion_test.go		fileversion_test.go
folder.go		folder.go
folder_test.go		folder_test.go
folderjob.go		folderjob.go
folderjob_test.go		folderjob_test.go
go.mod		go.mod
go.sum		go.sum
release-please-config.json		release-please-config.json
usage_test.go		usage_test.go
webhook.go		webhook.go
webhook_test.go		webhook_test.go

License

imagekit-developer/imagekit-go

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ImageKit.io Go SDK

Table of Contents

Installation

Requirements

Usage

Request fields

Request unions

Response objects

Response Unions

RequestOptions

URL generation

Basic URL generation

URL generation with transformations

URL generation with image overlay

URL generation with text overlay

URL generation with multiple overlays

Signed URLs for secure delivery

Using Raw transformations for undocumented features

Authentication parameters for client-side uploads

Webhook verification

Verifying webhook signatures

Errors

Timeouts

File uploads

Retries

Accessing raw response data (e.g. response headers)

Making custom/undocumented requests

Undocumented endpoints

Undocumented request params

Undocumented response properties

Middleware

Semantic versioning

Contributing

About

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License

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