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A guide to using Hyphen's native Go SDK for evaluating feature flags in Go applications.

The go-sdk is Hyphen's native Go SDK for evaluating Toggle feature flags in Go applications and services.

Table of Contents

Installation

go get github.com/Hyphen/go-sdk

Authentication

The SDK requires a project public key (it starts with public_) and an application id. See Get a Project's Public Key for where to find these in the Hyphen dashboard.

These can be provided as options during initialization or via environment variables:

HYPHEN_PUBLIC_API_KEY=public_your_api_key
HYPHEN_APPLICATION_ID=your_application_id

Initialization

The SDK uses functional options to configure the client:

client, err := hyphen.New(
    hyphen.WithPublicAPIKey("public_your_api_key"),
    hyphen.WithApplicationID("your_application_id"),
)
if err != nil {
    log.Fatal(err)
}

Usage

Retrieve a boolean feature flag with a default fallback:

result := client.Toggle.GetBoolean(
    context.Background(),
    "hyphen-sdk-boolean",
    false,
    nil,
)
fmt.Printf("Boolean toggle value: %v\n", result)

See also