base64_decode('base64');

var string = "Hello folks how are you doing today?";
var encodedString = btoa(string); // Base64 encode the String
var decodedString = atob(encodedString); // Base64 decode the String

//Encode
echo 'linuxhint.com' | base64
//Decode
echo 'bGludXhoaW50LmNvbQo=' | base64 --decode

// Define the string
var string = 'Hello World!';
// Encode the String
var encodedString = btoa(string);
console.log(encodedString); // Outputs: "SGVsbG8gV29ybGQh"
// Decode the String
var decodedString = atob(encodedString);
console.log(decodedString); // Outputs: "Hello World!"

class Program
{ static void Main(string[] args) { var account = new ExternalAccount() { Name = "Someone" }; string json = JsonConvert.SerializeObject(account); string base64EncodedExternalAccount = Convert.ToBase64String(Encoding.UTF8.GetBytes(json)); byte[] byteArray = Convert.FromBase64String(base64EncodedExternalAccount); string jsonBack = Encoding.UTF8.GetString(byteArray); var accountBack = JsonConvert.DeserializeObject<ExternalAccount>(jsonBack); Console.WriteLine(accountBack.Name); Console.ReadLine(); }
}
[Serializable]
public class ExternalAccount
{ public string Name { get; set; }
}

const fromBase64toString = (data) => { return decodeURIComponent( atob(data) .split("") .map(function (c) { return "%" + ("00" + c.charCodeAt(0).toString(16)).slice(-2); }) .join("") ); };

 convertFile(file: File): Observable<string> { const result = new ReplaySubject<string>(1); const reader = new FileReader(); reader.readAsBinaryString(file); reader.onload = (event) => result.next(btoa(reader.result.toString())); return result; }
this.convertFile(event.target.files[0]).subscribe(base64 => {	this.base64Output = base64;
});
/// NOTE ///
// The event.target.files is just the File Object e.g. from a
// <input type="file"> form
// you can also create a file with the following command:
var f = new File([""], "filename");

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base64String.replace(/^data:image\/(png|gif|jpeg|jpg|pdf);base64,/, "")

 base64_decode(string $string, bool $strict = false): string|false // Example // base64_decode('VGhpcyBpcyBhIHN0cmluZw==') // Result: This is a string // For Encoding base64_encode(string $string): string // base64_encode('This is a string') // Result: VGhpcyBpcyBhIHN0cmluZw==