---
title: "Quickstart: Go"
description: "Evaluate a flag in a Go backend with OpenFeature and EZGH's Go provider."
---

> Documentation Index
> Fetch the complete documentation index at: https://docs.ezghcloud.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Quickstart: Go

## 1. A flag and a server key

```sh
ezgh flags envs create production
ezgh flags create new-checkout --name "New checkout"
ezgh flags toggle new-checkout --env production --on
export EZGH_FLAGS_SDK_KEY=$(ezgh flags keys create --env production --kind server --name quickstart)
```

## 2. Install

```sh
go get github.com/ezgamehost/flags-provider-go@v0.1.0 github.com/open-feature/go-sdk
```

## 3. Evaluate

```go
package main

import (
	"context"
	"fmt"
	"log"
	"os"

	ezghflags "github.com/ezgamehost/flags-provider-go"
	"github.com/open-feature/go-sdk/openfeature"
)

func main() {
	provider := ezghflags.New(os.Getenv("EZGH_FLAGS_SDK_KEY"))
	if err := openfeature.SetProviderAndWait(provider); err != nil {
		log.Fatal(err)
	}
	defer openfeature.Shutdown()

	flags := openfeature.NewClient("checkout")
	evalCtx := openfeature.NewEvaluationContext("user-1842", map[string]any{"plan": "pro"})
	details, err := flags.BooleanValueDetails(context.Background(), "new-checkout", false, evalCtx)
	if err != nil {
		log.Println(err)
	}
	fmt.Println(details.Value, details.Reason)
}
```

It prints `true STATIC`: turned on, a new boolean flag serves `true` to everyone. Change the flag's targeting ([Targeting](/flags/targeting)) and a
running process gets the change within seconds.

The provider downloads the environment's flags and evaluates locally, follows a stream of changes,
and keeps evaluating its last flags while disconnected. Options:

| Option | Does |
| --- | --- |
| `ezghflags.WithEndpoint(url)` | Another data plane than `https://flags.ezghcloud.com` |
| `ezghflags.WithHTTPClient(c)` | Your own `*http.Client` |
| `ezghflags.WithBootstrapFile(path)` | Start from a file written by `ezgh flags export` |
| `ezghflags.WithOffline()` | Use only the bootstrap file, with no network |

Source: https://docs.ezghcloud.com/flags/quickstart-go/index.mdx