Localization package for golang
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gotrans - localization package for golang

Localization package for GO, it uses JSON files to localize your GO application

Getting started


Install the package with the command

go get github.com/bykovme/gotrans

Prepare translation files

JSON files should use following format:

    "hello_world":"Hello World",
    "find_more":"Find more information about the project on the website %s"

JSON file name should use standard language code or language-country code supported by browsers. At least one file "en.json" should be in the localization folder.

Quick documentation

There are just 3 functions in the package

InitLocales(path string)

Use the relative or absolute path to set the folder where all the JSON files with translations are located. Make sure that all the files with translations have extension ".json"

Tr(lang string, key string) string

Get translation value by the language & key

DetectLanguage(acceptLanguage string) string

This function will be useful when you are creating web application, it detects the language from HTTP header Accept-Language, check the usage of the function in the example below

Example of using gotrans package

The same example is located within the package here

package main

import (


func handler(w http.ResponseWriter, r *http.Request) {
	lang := gotrans.DetectLanguage(r.Header.Get("Accept-Language"))
	fmt.Fprintf(w, "<html><head><title> %s </title></head><body>", gotrans.Tr(lang, "hello_world"))
	fmt.Fprintf(w, "<h2> %s </h2>", gotrans.Tr(lang, "hello_world"))
	githubLink := "https://github.com/bykovme/gotrans"
	link := fmt.Sprintf(`<a href="%s">%s</a>`, githubLink, githubLink)
	fmt.Fprintf(w, gotrans.Tr(lang, "find_more"), link)
	fmt.Fprint(w, "</body></html>")

func main() {
	err := gotrans.InitLocales("langs")
	if err != nil {

	http.HandleFunc("/", handler)
	http.ListenAndServe(":3000", nil)


If the key is not found in the localization file, it will try to find the same key in English localization ("en.json"), if the key is not found there as well, the key will be returned instead of value.

The End