├── go.mod
├── extractVideo
    └── extVideo.go
└── main.go


/go.mod:
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1 | module ytTHumbnailDownloader
2 | 
3 | go 1.22.2
4 | 


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/extractVideo/extVideo.go:
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 1 | package extractVideo
 2 | 
 3 | import (
 4 | 	"net/url"
 5 | 	"strings"
 6 | )
 7 | 
 8 | func ExtractVideoId(videoURL string) string {
 9 | 	parsedURL, err := url.Parse(videoURL)
10 | 	if err != nil {
11 | 		return ""
12 | 	}
13 | 
14 | 
15 | 	if parsedURL.Host == "youtu.be" {
16 | 		return strings.Trim(parsedURL.Path, "/")
17 | 	}
18 | 
19 | 	if parsedURL.Host == "www.youtube.com" || parsedURL.Host == "youtube.com" {
20 | 		queryParams := parsedURL.Query()
21 | 		return queryParams.Get("v")
22 | 	}
23 | 
24 | 	if strings.Contains(parsedURL.Path, "/embed/") {
25 | 		parts := strings.Split(parsedURL.Path, "/")
26 | 		return parts[len(parts)-1]
27 | 	}
28 | 
29 | 	return ""
30 | }
31 | 


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/main.go:
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 1 | package main
 2 | 
 3 | import (
 4 | 	"fmt"
 5 | 	"io"
 6 | 	"log"
 7 | 	"net/http"
 8 | 	"os"
 9 | 	"ytTHumbnailDownloader/extractVideo"
10 | )
11 | 
12 | func main() {
13 | 	fmt.Print("Enter the YouTube Video URL: ")
14 | 	var urlVideo string
15 | 	fmt.Scanln(&urlVideo)
16 | 
17 | 	videoId := extractVideo.ExtractVideoId(urlVideo)
18 | 	if videoId == "" {
19 | 		log.Fatal("Invalid URL")
20 | 	}
21 | 
22 | 	thumbnailURL := fmt.Sprintf("https://img.youtube.com/vi/%s/maxresdefault.jpg", videoId)
23 | 
24 | 	res, err := http.Get(thumbnailURL)
25 | 	if err != nil {
26 | 		log.Fatal("Failed to download thumbnail")
27 | 	}
28 | 	defer res.Body.Close()
29 | 
30 | 	fileName := videoId + ".jpg"
31 | 	file, err := os.Create(fileName)
32 | 	if err != nil {
33 | 		log.Fatal("Failed to create file")
34 | 	}
35 | 	defer file.Close()
36 | 
37 | 	_, err = io.Copy(file, res.Body)
38 | 	if err != nil {
39 | 		log.Fatal("Failed to save image")
40 | 	}
41 | 
42 | 	fmt.Printf("Thumbnail saved at: %s\n", fileName)
43 | }
44 | 


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