I am new to golang, I am trying to create a zip that must have a folder inside that is: tosend.zip/archivos/file.png

Question

newZip, err := os.Create("./temp/tosend.zip")
if err != nil {
    return "", err
}
defer newZip.Close()

zipWriter := zip.NewWriter(newZip)
_, err = zipWriter.Create("archivos/")
if err != nil {
    return "", err
}
defer zipWriter.Close()

Answer 1

You are almost there. A file name can contain directories. Use this code:

zipWriter := zip.NewWriter(newZip)
w, err := zipWriter.Create("archivos/file.png") // <-- use full path here
if err != nil {
    return "", err
}
w.Write(pngData)

Run it on the playground.